Ap disc replacement

[flatout]

Just a quick question.

When replacing the AP front discs, does the unit come complete or is it just the outer section hence a need to unscrew and attach to the existing bell?

Thanks
R

[shimmy]

Just a quick question.

When replacing the AP front discs, does the unit come complete or is it just the outer section hence a need to unscrew and attach to the existing bell?

Thanks
R

comes without the bell and lock nuts/bolts (CP2494-18 x2 Disc Bell Mounting Kit)

but you can order i believe a set with the bell fitted if you ask for the right number

if you do it yourself you will need two sets of nuts/bolts from AP and the appropriate spanners and wd40 and a whole host of patience (the bolts only get torqued to 14nm so you will need a very low nm torque wrench)

you can get the front discs off and nw ones on WITHOUT taking the callipers off, just need to remove the pads.

[flatout]

thanks

[Fasteddie]

I can't seem to find a guide on the pad replacement for the front AP set up, sounds like Shimmy knows and that it's probably on here somewhere. can somebody point me in the right direction? Discs and pads are here and I'd like to get them on, cheers. I'm guessing from what I've read here that the calipers don't even need removing which is a bonus.

[shimmy]

1. jack up car
2. front wheel off (no need to remove callipers for pad OR disc change)
3. allen key (6mm i think) to remove two allen bolts (items 17 x 2) on side of calliper
4. slide out two tubes and anti rattle clip (item 9 - note arrow should point up)
5. from the back of the calliper push against the metal of the pad to compress pistons as far as possible
6. slide out pad, slide in new (check same shape pads:whistle:)
7. repeat for second pad
8. slide in tubes and anti rattle clip (arrow facing up)
9. push in bolt and just nip onto thread
10. push in other bolt and just nip onto thread
11. tighten both with allen key to hand tight (no need to overtighten)
12. clean out AP logo
13. fit wheel
14. torque bolts about 110Nm
15. jack down car

then repeat other side

where people make mistakes is on the removing allen bolts
(item 17 x 2), if you dont remove them easily or if you dont locate the bots right or overtighten them you can bugger the thread where they locate as there are helicoils inside.


http://i401.photobucket.com/albums/pp97/shimmylasco/CSL/Cp5575pdf.jpg

[Fasteddie]

Wow that does look easy. Thanks a lot shimmy, I'll be doing that this sat morning

[escarolo]

I will replace AP discs with PFB disc that I have at home now. Do I have to remove the caliper or not? How??

Best regards

[shimmy]

I will replace AP discs with PFB disc that I have at home now. Do I have to remove the caliper or not? How??

Best regards


no you dont

take out the pads and release the disc bell with the two allen key studs and the disc and bell come out at an angle with the calliper in place (you might have to make sure the pistons are in if the pads were low)

when you fit the AP bell to the PF discs use new lock bolts and only tighten to 10Nm starting at alternate sides


getting the old bolts off is the hardest bit :banghead:

[Nords]

Or take it to Shims with a bottle of sweet sherry!
:thumbs:

[shimmy]

Or take it to Shims with a bottle of sweet sherry!
:thumbs:

I do like a bit of Harveys Bristol Cream :)

[TMAQ]

getting the old bolts off is the hardest bit :banghead:

yes!! i ended up grinding most of mine off, was tempted to order a new bell but persevered.

[Fasteddie]

crikey I had to give up taking the discs off as I didn't have the right allen key for the impact screwdriver, let alone get the pesky bolts out. I'll be ordering some of those then

[shane@mbtech]

yes!! i ended up grinding most of mine off, was tempted to order a new bell but persevered.


I have never had an issue with these, 10mm spanner iirc, allen key socket with 3/8 buzz gun(all snap-on), off in few mins. Ive done loads and never had an issue before.

[TMAQ]

I have never had an issue with these, 10mm spanner iirc, allen key socket with 3/8 buzz gun(all snap-on), off in few mins. Ive done loads and never had an issue before.

10 or 11 mm maybe. mine were very corroded, only had an allen key and a spanner. did have some male hex attachments for the torque wrench but not good quality snap-on ones, so used the sharp ended allen key to do the job. think i got an e8 torx snap-on for fitting the new nuts as i was fed up with my poor tools (not that a workman blams his tools :whistle:)

[escarolo]

no you dont

take out the pads and release the disc bell with the two allen key studs and the disc and bell come out at an angle with the calliper in place (you might have to make sure the pistons are in if the pads were low)

when you fit the AP bell to the PF discs use new lock bolts and only tighten to 10Nm starting at alternate sides


getting the old bolts off is the hardest bit :banghead:


I have a new set of AP bolts, so I will do it as you say, but AP recomends between 15 and 20 Nm torque

Best regards

[TMAQ]

I have a new set of AP bolts, so I will do it as you say, but AP recomends between 15 and 20 Nm torque

Best regards

there is a AP diagram somewhere (probably posted by shimmy), similar to the one on this post which states 14nm.

[escarolo]

I found this:

http://i43.tinypic.com/wjz1fs.jpg

[shimmy]

Ap def states 14Nm

[escarolo]

I posted the instructions of Perfomance Friction Brakes, that are the discs that I am going to install.

So, what torque should I apply?

Best Regards

[shimmy]

I posted the instructions of Perfomance Friction Brakes, that are the discs that I am going to install.

So, what torque should I apply?

Best Regards

PF disc on AP bells with AP nuts and bolts :)

doubt it matters tbh as 14-16 Nm is pretty loose anyway.

Try 15Nm and cross your fingers ;)

[escarolo]

PF disc on AP bells with AP nuts and bolts :)

doubt it matters tbh as 14-16 Nm is pretty loose anyway.

Try 15Nm and cross your fingers ;)


Thanks, I wil try 15 Nm and let´s see what happens. In this moment I have the AP discs with cracks and almost "destroyed" but the car brakes perfect, very hard and no vibrations. I will try to change the rotors without dismount the caliper, but I suppose that is going to be very difficult.

Best Regards

[shimmy]

. I will try to change the rotors without dismount the caliper, but I suppose that is going to be very difficult.

Best Regards

easy, just have to get it straight to the calliper and it goes straight in as long as pistons are in :thumbs:

[escarolo]

easy, just have to get it straight to the calliper and it goes straight in as long as pistons are in :thumbs:

So the steps are:

1. Jack the car
2. Remove whell :hahaha:
3. Remove pads
4. Move the pistons into the caliper
5. Remove bolts between discs and bells
6. Remove discs?

Sorry for my poor english...:(

[shimmy]

So the steps are:

1. Jack the car
2. Remove whell :hahaha:
3. Remove pads
4. Move the pistons into the caliper
5. Remove bolts between discs and bells
6. Remove discs?

Sorry for my poor english...:(

No

1. Jack the car
2. Remove wheel :hahaha:
3. Remove pads
4. Move the pistons into the calipers
5. Undo two screws holding bell/disc to hub
6. Remove discs
7. When off the car remove bolts holding bell to old disc

[escarolo]

No

1. Jack the car
2. Remove wheel :hahaha:
3. Remove pads
4. Move the pistons into the calipers
5. Undo two screws holding bell/disc to hub
6. Remove discs
7. When off the car remove bolts holding bell to old disc


Ahhhh! Now it is perfectly clear!

I promise you a lot of pics

Best Regards from Madrid!

[TMAQ]

this is what i was looking for...

http://www.apracing.com/drawings/p12116.pdf

[flatout]

Can someone please post up some pics of the ap front kit installed, I just want to see how the anti rattle clips fit ie which way does the arrow point..

Cheers
Rich

[shimmy]

Can someone please post up some pics of the ap front kit installed, I just want to see how the anti rattle clips fit ie which way does the arrow point..

Cheers
Rich

Arrow points upwards and obviously the tubes hold the clip in place

[flatout]

Thanks shim.

That's what I did but just wanted to check I was on the right track...

[shimmy]

Thanks shim.

That's what I did but just wanted to check I was on the right track...

witht he anti rattle clips the only two mistakes you can make - which i know very well are

1. The front ones upside down
2. The rear ones inside out (should bow in to the calliper to hold the pad, not out)

[flatout]

Did all this then took the car for a spin and I can still hear the pad knocking a about a second after i apply the brakes. It's almost like one of the pistons has a delayed reaction

Not sure if bleeding the brakes will help at all??

[glendog74]

My pads occasionally 'clunk' at slow speeds - there is obviously some element of movement play with APs when you are only lightly applying braking force.

I have had 3 sets of pads (DS2500, RS29 x 2) and they have all done this - i am used to it now!