AP rear pads/discs choices - ?

[Pip1968]

Following someone's post regarding the pins seizing in their caliper I checked my pins. Actually, as she has been holed up in the garage for the last few months I decided to put the rears into Lepsons for a refurbish - £100 a pop each!!. Anyway the pins were fine with a little corrosion around the calpier's recess of the 6mm hex bolt in the form of white powedery residue.

Whilst doing that I checked the rear discs ~ 19mm and the pads 10mm. So is there any cause for concern are they within tolerance, should I replace either or both of them and what are the choices - ? I am still running DS 2500s in the front when not on track but am not sure what the rears are... presumably the same. I do not really want RS29s on the rear regardless of any equilibrium or not.

Incidentally I bought a spare set of RS29s for the Porsche's 350mm discs and only looked at my card statement last week £445.29 :(. I kind of assumed they would be comparable to those for a CSL with APs.

Anyway pictures below. Apologies for lack of clarity. The first picture shows the material side and the second the backs. Both covered in rust from the discs.

Pip

[Pip1968]

Ps Can someone confirm that the wheel nuts should be torque at 120nm.

Pip

[northernjim]

Ps Can someone confirm that the wheel nuts should be torque at 120nm.

Pip

Just make sure you do them up to 88lbs/ft..... :whistle:






I'm not sure about the rest, but my pads work until I hit metal!!

[shimmy]

Just make sure you do them up to 88lbs/ft..... :whistle:


I'm not sure about the rest, but my pads work until I hit metal!!



Absolutely, scrapping sound is the warning :)

All ok.

[Pip1968]

I was wondering when you would be along with your scraping tip top tip Shimmy :-D. So any idea on the minimum thickness for the rear discs and what other options there were aside from OEM with an AP set up - PF?.

I have not looked into prices for the OEM one or spoken to BMW as I am abroad now anyway.

Pip

[Bounce]

Oem minimum rear disc thickness is 18.4 mm Pip.I only know this because I renewed my discs and pads yesterday and the minimum thickness is etched on them;)

[CraigMillwardCroft]

Oem minimum rear disc thickness is 18.4 mm Pip.I only know this because I renewed my discs and pads yesterday and the minimum thickness is etched on them;)
You must be the only bloke to read things on parts :whistle:

[Bounce]

You must be the only bloke to read things on parts :whistle:I didn't read it,my mate noticed it.:-D

[northernjim]

As long as everything is wearing flat Pip, then carry on using them ( with a new set ready to pounce on first sound of a scrape:bigcry::smokin:)

Oem minimum rear disc thickness is 18.4 mm Pip.I only know this because I renewed my discs and pads yesterday and the minimum thickness is etched on them;)

How thick are they when new then? 20mm?

[Bounce]

As long as everything is wearing flat Pip, then carry on using them ( with a new set ready to pounce on first sound of a scrape:bigcry::smokin:)



How thick are they when new then? 20mm?Yes mate and the fronts 28mm;)

[Pip1968]

Stop skim reading my rambling and boring posts..... I am refering to rear discs not fronts.

I assume that you have either made a typo Bounce or you are talking about fronts at 28mm when new. Thank you for further reassurance CraigMillwardCroft (is that triple barrel super posh/rich - ?).

Are most of those with APs on the rear running with RS29s then. I assume standard OEM pads on the rear will be fine too.

Pip :-D

Apologies Bounce I am trying to multi task and have skim read myself - rear 20mm front 28mm when new - noted :notworthy:

[Neil M]

RS. 29's all round, even on OEM brakes they make a big difference.

[shimmy]

Oem minimum rear disc thickness is 18.4 mm Pip.I only know this because I renewed my discs and pads yesterday and the minimum thickness is etched on them;)

Yes mate and the fronts 28mm;)

Stop skim reading my rambling and boring posts..... I am refering to rear discs not fronts.

I assume that you have either made a typo Bounce or you are talking about fronts at 28mm when new. Thank you for further reassurance CraigMillwardCroft (is that triple barrel super posh/rich - ?).

Are most of those with APs on the rear running with RS29s then. I assume standard OEM pads on the rear will be fine too.

Pip :-D

Apologies Bounce I am trying to multi task and have skim read myself - rear 20mm front 28mm when new - noted :notworthy:


This thread was always dooooooomed

[Bounce]

Stop skim reading my rambling and boring posts..... I am refering to rear discs not fronts.

I assume that you have either made a typo Bounce or you are talking about fronts at 28mm when new. Thank you for further reassurance CraigMillwardCroft (is that triple barrel super posh/rich - ?).

Are most of those with APs on the rear running with RS29s then. I assume standard OEM pads on the rear will be fine too.

Pip :-D

Apologies Bounce I am trying to multi task and have skim read myself - rear 20mm front 28mm when new - noted :notworthy:Apology accepted,as you can now see I was answering Jim's post and not yours.;)

[shimmy]

Apology accepted,as you can now see I was answering Jim's post and not yours.;)

Tbh it's just a surprise to get more than :hahaha::hahaha:





:blalalala:



.

[Bounce]

Tbh it's just a surprise to get more than :hahaha::hahaha:





:blalalala:



.:hahaha::hahaha::finga:

[Kev Ush]

Following someone's post regarding the pins seizing in their caliper I checked my pins. Actually, as she has been holed up in the garage for the last few months I decided to put the rears into Lepsons for a refurbish - £100 a pop each!!. Anyway the pins were fine with a little corrosion around the calpier's recess of the 6mm hex bolt in the form of white powedery residue.


I don't have AP's on my M3 but I imagine the corrosion is galvanic reaction caused by dissimilar metals with the caliper being aluminium and the pins being steel??

I use this stuff on my Elise (and anything else that has 2 dissimalar metal touching each other) anywhere I have anything bolting to the aluminium chassis. http://www.eliseparts.com/products/show/60/408/duralac/ it seems to have stopped my chassis from going all white and powdery and its cheap. Lasts ages to...I'm still on my first tin.

Kev.

[billyboysm3]

Gareth will know. Personally I would run Rear OEM discs with RS29 as Im sure the AP rear discs do not have any advantage over OEM just look nicer.

[JBird]

Hi,

Also looking into a set of APs. Does anybody know the min thickness for front OEM discs? New is 28mm. There is a bloke on PH selling set of AP front calipers (http://www.pistonheads.com/classifieds/parts-and-plates/parts-and-accessories/bmw/ap-racing-e46-m3-6-pots-bbk/1320029), with OEM discs skimmed to 25mm. Wondering if there is really much life left in these???

if buying a completly new AP kit, and planning on running RS29s for track, (maybe keeping the DS2500 for road) are the front discs that come in the AP BBK considered any good, or do I need to expect to shell out for PF discs a short time later?

cheers!

[northernjim]

Hi,

Also looking into a set of APs. Does anybody know the min thickness for front OEM discs? New is 28mm. There is a bloke on PH selling set of AP front calipers (http://www.pistonheads.com/classifieds/parts-and-plates/parts-and-accessories/bmw/ap-racing-e46-m3-6-pots-bbk/1320029), with OEM discs skimmed to 25mm. Wondering if there is really much life left in these???

if buying a completly new AP kit, and planning on running RS29s for track, (maybe keeping the DS2500 for road) are the front discs that come in the AP BBK considered any good, or do I need to expect to shell out for PF discs a short time later?

cheers!

3mm taken from a 28mm disc sounds too much IMO :(



AP discs are fine in the proper kit, you should get a few sets of pads out of them :thumbs:

[shimmy]

I agree, AP discs are good if you don't use ds2500 on track.

I think wear is 2mm so 3mm skim sounds like pants. (I may be wrong)

[Bounce]

Hi,

Also looking into a set of APs. Does anybody know the min thickness for front OEM discs? New is 28mm. There is a bloke on PH selling set of AP front calipers (http://www.pistonheads.com/classifieds/parts-and-plates/parts-and-accessories/bmw/ap-racing-e46-m3-6-pots-bbk/1320029), with OEM discs skimmed to 25mm. Wondering if there is really much life left in these???

if buying a completly new AP kit, and planning on running RS29s for track, (maybe keeping the DS2500 for road) are the front discs that come in the AP BBK considered any good, or do I need to expect to shell out for PF discs a short time later?

cheers!Minimum thickness of oem front discs is 26.4mm;)

[Neil M]

'sailorbaz has just bought an AP BBK and sold the DS2500 pads that came with the kit, in preference for a set of RS29's, they're good all round pads for both road and track.

As regards the set on PH skimmed discs, my 1st question why have them skimmed? You can get deposits off without the need for skimming. One looks as though it's had a whack as the outer edge is deformed, it also says that they are newly painted, if they are less than 3 years old why?

Nothing keeps you safer than brakes, personally I would go for new or off a fellow member of the register, that way you know they're right.:thumbs:

[JBird]

Cheers fellas,

I also thought 3mm wear sounded too much. I'll just get new ones and be done with it. Are the RS29s not a bit squealy for everyday use (thought I read that on here somewhere....)

[shimmy]

Cheers fellas,

I also thought 3mm wear sounded too much. I'll just get new ones and be done with it. Are the RS29s not a bit squealy for everyday use (thought I read that on here somewhere....)

They can be if used for road a lot.

[Kev Ush]

What is wrong with the DS2500 pads that everyone seems to swap them out for something else?

Kev.

[alexk]

What is wrong with the DS2500 pads that everyone seems to swap them out for something else?

Kev.


Hi Kev, a search in the forum would help

[Mike R]

What is wrong with the DS2500 pads that everyone seems to swap them out for something else?

Kev.

They're not really suitable for heavy cars and so overheat in hard use. What this does is then leave deposits of brake pad material on the disc surface (visible as black smudges), which then causes disc run-out issues (brake judder). The material can be removed from the discs if caught early enough and no damage is experienced, but if left it can eventually lead to the discs warping due to the fact that the discs do not heat up evenly (the material embedded on the disc preventing disc to pad contact).