PF brake discs - are they really any good!?

[shimmy]

Over the last 4 years i have had 3 sets of front AP discs and 1 set of PF discs, which are currently still on the car. i have to say i dotn think the PF discs are any better than the AP discs on my test results. See below.:smokin:

My first set of AP discs lasted only 700 track miles and around 2500 road miles and were 'warped' by either my crap driving first time out at Bedford OR pad deposits made them feel like they were warped, so eventually they were swapped out (April 07-August 07)

My second set of AP discs lasted around 1700 track miles and 10000 orad miles and were A1. 9August 07 - July 08). THIS IS HOW THEY LOOKED

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/CatherineWedding033.jpg

My third set of AP discs lasted around 2100 track miles and approx 6000 road miles. (July 08 - April 09). When i took these off they were a bit worse for wear, worse than the ones above.

My first set of PF discs are now just over 1800 track miles and only say 5000 road miles since May 2009 and look like this. They are now in need of changing and i am thinking i might go back to AP as they are cheaper and LAST LONGER.


http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/PFdisc3.jpg

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/PFdisc2.jpg

[s.mac]

I have used pf disks for 3-4 years and still on 1st set (the dimpled ones), they were replacement M3 OEM size, the disks are still OK, the callipers were 4 pot all round with mintex race pads. I would say I got excellent wear out of them with plenty of track time.
I have just put the APs on with new pf disks with pagid pads so I will have to see if there is any difference, yours don't look good at all for the mileage ....

[Mark CSL]

Best discs in the world shimmy :thumbs:

[TANKSLAPPER]

AP are shit, just look on the outer crack on the AP disc that could well be a serious accident.

PF use the best steel and are prefect balance without the use of grinding and clip weights in the cooling vein like AP do.

[shimmy]

AP are shit, just look on the outer crack on the AP disc that could well be a serious accident.
.

but i have to say i run the APs far too long to get that crack, much longer than the PFs so at the same lifespan i think PF would have been worse tbh

[AlexGTT]

Mmmmm, strange. I have to say I found the opposite.

My AP discs were cracked to the edges like your pic within 5-6000 miles. Probably 1000 of those on track.

My first set of PF discs lasted 10-11000 miles. About 1500-1700 miles on track (mostly Ring laps).

My second set of PF's are still on the car. I think I've done 5000 miles on them, probably half on track, mostly Ring but at least 4 UK trackdays. They still look spot on and performed great again at Snetts last week. Look as if they'll easily last another 5000 of the same.

I think the differences in wear could be down to driving style.

[s.mac]

were the disks bedded in till they turned blueish in colour?

[_Nathan_]

Shim - road miles mean nothing in this do they? The PF disks have done 100 more track miles than the AP disk in your picture and aren't as bad as the AP disks? You also said you ran the pads really low which isn't going to help much?

[AlexGTT]

Shim - road miles mean nothing in this do they? The PF disks have done 100 more track miles than the AP disk in your picture and aren't as bad as the AP disks? You also said you ran the pads really low which isn't going to help much?

Good point Nathan, on both counts. In fact, the only reason I had to replace my first set of PF's was because I ran my pads down to the metal at Spa last year.:banghead: Had to have a part worn set of RS15's off Curly to get me home.:whistle:

[shimmy]

third set AP 2100 miles on track and PF 1800 miles on track BUT i guess they are not as badly worn as the APs yet.

i think these PF have had a harder life as the pads have worn a little low occassionally (like at Snett) so the extra heat might have had some effect.

[_Nathan_]

I really rate them still, obviously possible you got a bad set though.

[glendog74]

I have read this thread with interest as i have a very positive experience of my AP disc setup.

I had APs fitted all round in November 08 - initially with Ferodo DS2500 pads. I quickly realised that the Ferodo pads weren't up to the job after just 2 track days so swapped to Pagid RS29s and have used these since with good results and am almost through my second set of front pads. The original rears are almost dead too.

I had the APs fitted at around 50k miles - my car has recently just turned 63k miles...

During these 18 months/13k miles, i have done a further 5 track days as well as 6 trips to the Ring totalling around 250 laps (approx 3275 Ring miles).

Apart from the usual thin hairline cracks in the centre of the disc contact area extending out towards the edge, i have had no issues with cracking on the disc outer edge as mentioned earlier. The discs are probably good for another 2-3k miles i reckon.

I had always heard good things about PF discs and had planned to swap to those when my current discs die soon. BUT - with the experience i have had with AP discs so far, i have to say i am very tempted to continue using them in the future - especially if they are cheaper than PF :thumbs:

BTW - i love you Shim :smt055

[northernjim]

I have read this thread with interest as i have a very positive experience of my AP disc setup.

I had APs fitted all round in November 08 - initially with Ferodo DS2500 pads. I quickly realised that the Ferodo pads weren't up to the job after just 2 track days so swapped to Pagid RS29s and have used these since with good results and am almost through my second set of front pads. The original rears are almost dead too.

I had the APs fitted at around 50k miles - my car has recently just turned 63k miles...

During these 18 months/13k miles, i have done a further 5 track days as well as 6 trips to the Ring totalling around 250 laps (approx 3275 Ring miles).

Apart from the usual thin hairline cracks in the centre of the disc contact area extending out towards the edge, i have had no issues with cracking on the disc outer edge as mentioned earlier. The discs are probably good for another 2-3k miles i reckon.

I had always heard good things about PF discs and had planned to swap to those when my current discs die soon. BUT - with the experience i have had with AP discs so far, i have to say i am very tempted to continue using them in the future - especially if they are cheaper than PF :thumbs:

BTW - i love you Shim :smt055


the ring is less heavy on your brakes tho than a normal circuit......

[glendog74]

the ring is less heavy on your brakes tho than a normal circuit......

Yes - i know Jim...

P.S. I love you too :smt055

[s.mac]

only if you know it :whistle:

[shimmy]

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/f1613655.jpg

so my PF front discs finally bit the dust at Rockingham. Just one crack to the edge but a bad one which I could straight away feel thru the brake pedal.

They covered 2100 track miles, same as the last AP set, but using RS14 pads instead of RS29, which are meant to be a little softer and kinder to the disc.

Overall I think the PF are certainly no better and possibly a little worse than the AP DISCS.

So I've just put the AP discs on I got from Lawsy. If the scouser ain't sold me a bent set then with the little wear they have they should last 1500-1800 track miles.

[glendog74]

My car is booked into Simpson this Friday for a full AP replacement. Anthony initially convinced me to go the PF route on the fronts but listened to my experience of APs and said that i must have a good set.

Incidentally, PF discs have recently gone up in price by £35 per disc and are now £285 + VAT per disc. APs are £60 cheaper per disc.

APs again for me :thumbs:

Not looking forward to the bill though... :banghead:

[shimmy]

Do you just mean discs Rob or are you doing calliper refurb as well?

Last time I was there for brakes they got me a calliper seal set and refurbed the fronts as the car had done 3 years + of track days

[glendog74]

Do you just mean discs Rob or are you doing calliper refurb as well?


New AP discs front & rear with Pagid RS29 all round.

My callipers should be ok at the moment as they were fitted in Nov '08 -covered 7 UK TDs and 7 Ring trips since.

[s.mac]

Those disks are f- -cked Shimmy
youre not getting good life out of either PF or AP !!!


Its the 1st time I've had pagid pads (29's), I think they are a very hard pad and I'm looking for a set of pads just to use for road pads, far too severe for road IMO

do you know the AP front and rear pad shapes so I can look at alternatives or can I cross reference the pagid part number? (if there's one on the box..)

[s.mac]

New AP discs front & rear with Pagid RS29 all round.


lazy sod, do it yourself ;)

[shimmy]

lazy sod, do it yourself ;)

It is an easy job tbh, even I do mine.......

[shimmy]

Those disks are f- -cked Shimmy
youre not getting good life out of either PF or AP !!!


Its the 1st time I've had pagid pads (29's), I think they are a very hard pad and I'm looking for a set of pads just to use for road pads, far too severe for road IMO

do you know the AP front and rear pad shapes so I can look at alternatives or can I cross reference the pagid part number? (if there's one on the box..)

I generally use the Pagid shape code (E8018 or E1903 will fit use disc front, E1265 rear) Nd either buy from Questmead or ASPerformance)

I used to swap between RS29 all round for track and DS2500 for road but fir last 18 months I have used RS14 front and DS2500 rear. No squeaking and not too harsh. Pads are much cheaper than RS29 but as you'd expect they do wear faster.

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/PagidRS1265shape.jpg

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/PagidRS8018shape.jpg

[glendog74]

lazy sod, do it yourself ;)

It is an easy job tbh, even I do mine.......

I know - i have done my pads before and would happily do the discs but i can't be arsed messing with the fluid - which will be done too.

Is there a handy guide anywhere for the fluid change and bleeding procedure? :smt017

[glendog74]

Its the 1st time I've had pagid pads (29's), I think they are a very hard pad and I'm looking for a set of pads just to use for road pads, far too severe for road IMO

do you know the AP front and rear pad shapes so I can look at alternatives or can I cross reference the pagid part number? (if there's one on the box..)

I must say that i find RS29 fine on road and they warm just fine for me. I may be able to help you with another choice however Steve - they are AP fitment too.

I bought a set of Mintex Racing M1144 pads last year from Questmead. I bought them as a decent quality set to use on road during winter months. I have not used these before but i believe they should cope with a track day or two also as well as road. They are made by TMD Friction - the same company that make the Pagid pads. I don't require these now as i rarely use my CSL in winter and the RS29s will stay fitted.

Let me know if you are interested - i can even bring them up to Yorkshire this weekend as i will be up that way :thumbs:

[shane@mbtech]

So I've just put the AP discs on I got from Lawsy. If the scouser ain't sold me a bent set then with the little wear they have they should last 1500-1800 track miles.


They should be fine Shimmy, if not 100% money back guarantee:thumbs:


Only £100 as well ya tight git:birdman:;)

[shane@mbtech]

I must say that i find RS29 fine on road and they warm just fine for me. I may be able to help you with another choice however Steve - they are AP fitment too.

I bought a set of Mintex Racing M1144 pads last year from Questmead. I bought them as a decent quality set to use on road during winter months. I have not used these before but i believe they should cope with a track day or two also as well as road. They are made by TMD Friction - the same company that make the Pagid pads. I don't require these now as i rarely use my CSL in winter and the RS29s will stay fitted.

Let me know if you are interested - i can even bring them up to Yorkshire this weekend as i will be up that way :thumbs:

I too have heard good things about these

Visiting the in laws then Rob:thumbs:

[alexk]

I know - i have done my pads before and would happily do the discs but i can't be arsed messing with the fluid - which will be done too.

Is there a handy guide anywhere for the fluid change and bleeding procedure? :smt017

In order to do proper brake bleeding in our cars, you need to use the BMW GT1 and open the DSC valves.
I can make a proper how-to since I do it on my own (I have a brake bleeder and a GT1 ;) ).

[shane@mbtech]

In order to do proper brake bleeding in our cars, you need to use the BMW GT1 and open the DSC valves.
I can make a proper how-to since I do it on my own (I have a brake bleeder and a GT1 ;) ).

Never used gt1 alex and never had any issues bleeding my brakes. :thumbs:

[glendog74]

Visiting the in laws then Rob:thumbs:

Indeed ;)

I can make a proper how-to since I do it on my own (I have a brake bleeder and a GT1 ;) ).

Cool :smokin:

[northernjim]

I must say that i find RS29 fine on road and they warm just fine for me. I may be able to help you with another choice however Steve - they are AP fitment too.

I bought a set of Mintex Racing M1144 pads last year from Questmead. I bought them as a decent quality set to use on road during winter months. I have not used these before but i believe they should cope with a track day or two also as well as road. They are made by TMD Friction - the same company that make the Pagid pads. I don't require these now as i rarely use my CSL in winter and the RS29s will stay fitted.

Let me know if you are interested - i can even bring them up to Yorkshire this weekend as i will be up that way :thumbs:

I too have heard good things about these

Visiting the in laws then Rob:thumbs:


I'd say the 1144's are slightly superior to ferodo2500's, with better initial bite (which I like in a brake pad, as I like to feel that I've started slowing down as soon as I put my foot on the brakes!) not as good as rs14's:smokin: tho....

[northernjim]

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/f1613655.jpg

so my PF front discs finally bit the dust at Rockingham. Just one crack to the edge but a bad one which I could straight away feel thru the brake pedal.

They covered 2100 track miles, same as the last AP set, but using RS14 pads instead of RS29, which are meant to be a little softer and kinder to the disc.

Overall I think the PF are certainly no better and possibly a little worse than the AP DISCS.

So I've just put the AP discs on I got from Lawsy. If the scouser ain't sold me a bent set then with the little wear they have they should last 1500-1800 track miles.


blaaaady hell shimmy, I've never seen a crack like that before:beer:

you should fair a little better from now on with your weightshaving tactics tho?





P.S. I love you too :smt055

:thumbs::gayfight:I'm blushing now mate, you should have said something over at the ring:hahaha::hahaha:

[shimmy]

This is my last set


http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/CatherineWedding033.jpg

[_Nathan_]

I thought RS14 were much higher friction than RS29 and therefore harder on disks? That is why I've stuck with 29s anyway?

http://www.braketechnology.com/images/frictiongraph.gif

[glendog74]

I thought RS14 were much higher friction than RS29 and therefore harder on disks? That is why I've stuck with 29s anyway?

http://www.braketechnology.com/images/frictiongraph.gif

Maybe that's why Shimmy is going through more sets of discs than i have hot dinners :hahaha:

[northernjim]

Over the last 4 years i have had 3 sets of front AP discs and 1 set of PF discs, which are currently still on the car. i have to say i dotn think the PF discs are any better than the AP discs on my test results. See below.:smokin:

My first set of AP discs lasted only 700 track miles and around 2500 road miles and were 'warped' by either my crap driving first time out at Bedford OR pad deposits made them feel like they were warped, so eventually they were swapped out (April 07-August 07)

My second set of AP discs lasted around 1700 track miles and 10000 orad miles and were A1. 9August 07 - July 08). THIS IS HOW THEY LOOKED

http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/CatherineWedding033.jpg





Apart from this one in your first post :blalalala:

[shimmy]

I thought RS14 were much higher friction than RS29 and therefore harder on disks? That is why I've stuck with 29s anyway?

http://www.braketechnology.com/images/frictiongraph.gif

I AM LED TO BELieVE rs14 HAVE BETTER FRICTION BUT LESS AGGRESIVE AND ABRASIVE THAN rs29 HENCE THE PAD WEARS NOT THE DISC (bloody caps)

i found that RS14 are £30 cheaper than RS29, 1mm thicker but last only 500 instead of 600 track miles. My front AP discs lasted 25% longer with RS14.

RS29 certainly have a tendancy to break up after 50% wear.

PAGID RS-14 Black Brake Pads

RS14 is our most popular ceramic based friction material. Compared to RS4-2 (http://www.cslregister.com/forum/rs42-blue-carbon-based.php) this compound offers a good increase in initial bite and average torque, it has very good modulation characteristics and offers good control against wheel lock at all temperatures.
While showing a reduction in pad wear, particularly at high temperatures it is still very easy in terms of disc wear and shows a reduction in surface stress fractures. RS14 will also tolerate much higher working disc temperatures than RS4-2 extending further the fade resistance.

RS14 is also used as an OEM material and supplied as an up-graded track day pad by Lotus Motorsport department. It has been shown to exhibit the most suitable level of braking force, control and modulation on popular track day cars such as Lotus Elise (http://www.cslregister.com/forum/../product-list.php?md=113) and Caterham (http://www.cslregister.com/forum/../vehicle-list.php?mk=6). Offering consistent levels of performance and a much longer life than more inferior competitors products, without excessive disc wear while offering the driver supreme confidence.

Outside the track day environment RS14 has also shown success in short to medium distance circuit racing as well as gravel and tarmac rallying. RS14 offer very low heat conductivity which allows less thermal transfer from disc through pad, thus resulting in lower caliper and brake fluid temperatures which can have a critical effect on ultimate brake performance.

RS14 has seen good levels of success at many levels of Motorsport, from front applications on front wheel drive touring cars, front and rear applications on 2 and 4 wheel drive rally cars, as well as front and rear applications on GT and sports racing cars.


PAGID RS-29 Yellow Brake Pads

Pagid RS29 is a recent development from the bases of RS19, with a very similar friction coefficient to RS19 with improvements in initial bite offering quicker response and slightly more temperature stable at the upper levels of the temperature range. Developments in raw material selection and compounding have resulted in improvements also in pedal feel and feedback, helping with modulation particularly on lighter applications.

This material provides very good levels of performance and response at all temperature levels, only slight temperature inputs are required to bring the pad up to its optimum performance level. Another favourite with endurance racers having won many classes at all major endurance events, such as Le-Mans, Daytona, Spa, Nurburgring, etc. Due to the exceptional pad life and very low wear on brake discs it has been possible to run 24 hours with out a change of pads or discs. Able to withstand slightly higher disc temperatures than RS19, this has proved more suitable for applications running very high disc temperatures.

Although designed primarily for endurance racing, because of the consistent levels of performance and user friendliness many competitors use this material successfully for sprint and short distance races also. This has been seen in British GT Cup class, winning the Championship for the last 3 years in races averaging 1-2 hours in duration. RS29 has also found favour in the growing track day market due to the level of control, good cold performance, long life and low disc wear.

The same applies to major track day operator fleets have seen the benefit of using PAGID pads for corporate track days as an alternative to RS19 (http://www.cslregister.com/forum/rs19-yellow-ceramic-based.php) in various applications. While not being the cheapest brake pads on the market, we have proved that due to the longer life and less disc wear in comparison to other competitor’s product, running costs can be reduced in comparison to cheaper, inferior products.

It is clear that the customer should look beyond the initial purchase price and make an accurate comparison with other competitor’s products to find the most cost effective braking solution. When compared to cheaper pads that wear more quickly and reduce disc life, and may also not perform consistently to the same level, the initially more costly product can often work out to be cheaper when calculated over the entire season.

[DuncanR]

blaaaady hell shimmy, I've never seen a crack like that before:beer:
You obviously never met my first wife then !! :hahaha:

Brakes ?? ...who uses them anyway ! PF fronts with RS29, hardly a sound !
What about front to rear brake bias Shim? ...maybe yours is a bit out mate and loading up the fronts too much? Just a thought ..

[shimmy]

You obviously never met my first wife then !! :hahaha:

Brakes ?? ...who uses them anyway ! PF fronts with RS29, hardly a sound !
What about front to rear brake bias Shim? ...maybe yours is a bit out mate and loading up the fronts too much? Just a thought ..

Maybe although I dropped off the RS29 at the rear because of the opposite problem.

How can brake bias be changed other than pad types?

[_Nathan_]

What are you running on the rears now then? If DS2500 over RS29 then you'll be using the front brakes more?

I can't see how you can increase friction that much and not wear the disk more? They certainly seem to major on disk life as part of the RS29 bumpf (24h races with no disk or pad change!).

[DuncanR]

Maybe although I dropped off the RS29 at the rear because of the opposite problem.

How can brake bias be changed other than pad types?

Hydraulically ! .. Im not familiar with technically how its done on a road going CSL, but you can change it in car in a race car. There will be a bias valve somewhere in the system which adjusts the braking depending upon how hard your car dives forward ! ... im probably talking bollox now and trying to sound clever, someone more learned with pop up with all the answers in a minute ... cue Gorilla, NZ Tom, Nathan et al !
Does your backside ever feel a bit loose Shim ?:gayfight: suggesting that the car IS more front biased ? BBK's are the thing that has an effect on the brake bias, especially if you only fit them to the fronts and not the rears ... well dont they ? :hahaha:

[_Nathan_]

No adjustable bias valve on a normal CSL - ways of changing the Bias I guess would be piston area, pad area, disk size\distance of caliper from hub & pad compound?

[shimmy]

[quote=_Nathan_;58041]What are you running on the rears now then? If DS2500 over RS29 then you'll be using the front brakes more?

[quote]

well def RS29 last 20% longer, i have a few years proof

but therefore surely if the pad is lasting longer the disc isnt:smokin:

[_Nathan_]

Not sure I follow that logic?

Look at the friction graphs - that is proof that there is more heat and friction generated at the disk face - that has to have an effect on disk wear?

[shimmy]

Not sure I follow that logic?

Look at the friction graphs - that is proof that there is more heat and friction generated at the disk face - that has to have an effect on disk wear?


in my simple mind irrespective of the heat generated by this pad you are stopping the same car from the same speed so energy dissipated is the same so maybe more heat but maybe for shorter period

surely the harder the pad the more wear on the disc for the same exercise!

[_Nathan_]

I'd have thought wear was a function of friction rather than just pad hardness?

Get some temp paint on the new disks, be interested to see what is going on...

[shimmy]

I'd have thought wear was a function of friction rather than just pad hardness?

Get some temp paint on the new disks, be interested to see what is going on...


as DS3000 prove, the compound of the pad will have a big effect on disc wear, not always the grippiest wears most. One side is always the weaker and my guess is wioth RS14 the pad wears forst and RS29 the disc more

Friction is what is caused by both touching - which wears more or less depends upon their make up

[_Nathan_]

Have you got the friction curve for DS3000? Very high I suspect? Is there a pad that is low in friction yet still wears disks at a very high rate?

I still think RS29 are kinder to disks :P

[glendog74]

I still think RS29 are kinder to disks :P

What he said ^^^ :whistle:

[shimmy]

I still think RS29 are kinder to disks :P

you may be right........

but theefore you are saying the RS29 wears slower and the disc wears slower and it stops the car as well or better - something doesnt add up!

[_Nathan_]

RS29 doesn't stop the car as well - look at the friction graphs! I always thought with RS19 \ RS29 you were trading outright stopping power for disk and pad life.

[shimmy]

yep

just found the Pagid paper that says that RS19/29 were developed from RS14 and "give a reduction in friction level and longer pad and disc life!!"

So my PF discs have done ok then :thumbs::hahaha:

And i was angling for PF to send me some new ones as a trial :banghead:

I may just try then rear RS29 pads next to see how it affects balance, not that i have been having any issues (always been ok at late braking) but will be interesting

[_Nathan_]

:hahaha::thumbs::smt055

[shimmy]

:hahaha::thumbs::smt055


your car seems to be very good on pad life

2 years/one set! ;)

[_Nathan_]

PMSL :bigcry:

Give me money and I'll go racing :whistle:

Anyway 2 years ago it was still my daily driver, only been caged for a year and a quarter :birdman:

[shimmy]

Anyway 2 years ago it was still my daily driver, only been caged for a year and a quarter :birdman:

excuse me, im just a sore looser!:thumbs:

[glendog74]

RS29 doesn't stop the car as well - look at the friction graphs! I always thought with RS19 \ RS29 you were trading outright stopping power for disk and pad life.

I'm more than happy with stopping power and longevity of discs/pads using the AP/RS29 combo.

But then i only weigh a third of Shimmy's mass... :whistle: :blalalala:

[shimmy]

I'm more than happy with stopping power and longevity of discs/pads using the AP/RS29 combo.

But then i only weigh a third of Shimmy's mass... :whistle: :blalalala:


at the speed you go youd be happy with cheese ( just a splodge of your KY)

[glendog74]

at the speed you go youd be happy with cheese ( just a splodge of your KY)

:hahaha: :hahaha: I'm more than happy with my speed at Spa - i have no records to try and beat. I also don't love it quite as much as you clearly do!

Come round the Ring with me next time... ;)

[shimmy]

Come round the Ring with me next time... ;)

nah, gotta leave you the King of somewhere









Anyway it scares me too much ;)









And I promised mself and the wife I wouldn't



Ohhh, go on then

[CT1]

I just had to say something Shimmy your discs are bad........
Reading the thread your are all talking about pad and disc wear. I think the cracks are caused by overheating the components and is not good err very dangerous can cause exploding disc with obvious consequences....

I google searched this artical about overheating discs:

"Cracked Discs

Braking surface cracks are seen as radial cracks appearing in the braking surface and rounding the edge of the disc at the inside or outside diameter of the braking surface.
These cracks are always caused by excessive heat which is usually caused by torque imbalance which shifts a greater share of the braking function to only a few of the vehicle brakes. The brakes which are providing a greater share of the braking action, will always be the ones to show the greater disc wear and will sometimes crack.
Cracked discs must always be replaced. If the disc is not replaced the cracks will gradually get worse and can eventually progress into the barrel section. After the discs are replaced the braking system should be checked for proper balance."

Interesting reading...someone has already mentioned inbalance from front to rear so not entirley overlooked.

By the way wheels are great eventually fitted new Kumhos, the ride is not to bad just have to drive round those pot holes.:supz:

[glendog74]

AP discs usually crack - just hairline fractures at first which get worse over time/usage. Quite normal - to a degree...

[shimmy]

will check for imbalance but i think they are fine

just been overused on track and very hard worked,

so far a front set lasts me a year and i wouldnt mind betting everytime they have been under minimum thickness

all in all each set does about 2100 track miles plus a load or road miles i between

I tend to swap them out as soon as i notice any cracks that go to the outer edge of the disc - seems to work so far

[DuncanR]

Interesting reading...someone has already mentioned inbalance from front to rear so not entirley overlooked.


I thank you ! :hahaha:


Shim , try sitting further back mate, would really help with the ..uh ..weight distribution !!

[glendog74]

I collected my car from Simpson's today having had discs/pads changed all round. I elected to stay with AP disc/Pagid RS29 pad combo as they have served me well so far. :thumbs:

Inspecting my old AP front discs revealed that i had lots of the small (normal) heat cracks and just one of those cracks had radiated to the disc edge. So not too bad really.

Top marks to Ant & Julian as always and the car is spot on, i just need to recover after the dent to my bank balance...! :bigcry:

[Bealo]

So what rear discs do you use????? Standard OEM or something else.


I tried the PF front discs this time around and so far so good :thumbs: I agree with pintpot regarding the RS29's top pads and mine rarely squeak on the road.

[glendog74]

So what rear discs do you use?????

I did stick with standard originally but have now moved to rear AP also.

[Bealo]

I did stick with standard originally but have now moved to rear AP also.


My rears are nearly FUBAR'd so might give the AP's a shot.

[shimmy]

My rears are nearly FUBAR'd so might give the AP's a shot.

They def look better ;)

[alexk]

The thing is that the OEM ones have aluminium center hub, while the APs are all metal.
I bet the APs are heavier ;)

Did anyone measure the weight of the rear APs ?
The OEM ones are 6.5kg

[AlexGTT]

I also stick with std rear disc with AP calipers and RS29's. Better and cheaper combo in my experience...........................















.....................unless your :gayfight: and require the full matching set look all round.:whistle:;)

[glendog74]

.....................unless your :gayfight: and require the full matching set look all round.:whistle:;)

Fook - i've been around Dazza too much! :gayfight:

You're CSL looks good sat on bricks right now Alex... :whistle:

[AlexGTT]

Fook - i've been around Dazza too much! :gayfight:

You're CSL looks good sat on bricks right now Alex... :whistle:

Yeah, thanks mate.

Can I have my wheels back please Mr.................................:hahaha:

[Bealo]

Fook - i've been around Dazza too much! :gayfight:

You're CSL looks good sat on bricks right now Alex... :whistle:


LOL :thumbs: ;) :gayfight:

[alexk]

Any recommendations for buying Performance Friction discs ?

Shall I stick with PF or shall I try AP this time ?

Thank you please.

[glendog74]

I have stayed with AP as my last set were very good indeed :thumbs:

[alexk]

I have stayed with AP as my last set were very good indeed :thumbs:

Hm, I might give it a try.

Are the AP ones cheaper ?

[glendog74]

Hm, I might give it a try.

Are the AP ones cheaper ?

Yes - by £30 per disc :thumbs: