Sticking Porsche Calipers?UPDATE: DISC SKIMMING THE CALIPER!

[volvic]

Hi,

I took my leon on a rapid run with some hard braking. The car stops great from speed however when they get hot (i mean very hot) i can hear the pad skim against the disc. Both sides do it, (it still stops fine and obviously when it gets to this stage i drive slowly). Once cool its totally fine. I've asked a few of my knowledgeable friends and the same happens to them on the same run and they also have 4 pot brakes. (something about heat expansion)

Is this normal? I've got 996 porsche calipers, porsche pads and drilled 330mm discs..

just looking for some reassurance...

 

[jonjay]

I found recently after doing some heavy breaking that my pad compound has hardened and I get a grinding noise once they have heat in them. The ATE pad is a race pad so quite agressive. The problem you got is quite common I believe so nothing to worry about...someone else may want to confirm however.

 

[volvic]

bump!

this is starting to annoy me as im sure this wouldnt actually happen on a porsche....

thinking of getting a porsche repair kit

 

[james walker]

do your pads cover all the disc or do they leave a 2cm ish gap on the inward part?

mine do do this aswell, when hot, hard braking they sometimes feel like they lock a little... thats with ds2500s aswell.

 

[Fl@pper]

are you running the same spec diam/width disc as the original calipers ?

and if so has the caliper mounted with the disc 'truely' in centre ?

if you are cooking them up to real 'hot' i would expect to get some expansion no matter what vehicle they are on to be honest but with them retrofitted it might be time to think about some ducting/airflow for helping them cool as i bet the porsche has designed something even if it's only the wheels

 

[volvic]

thanks for the replies.

the pad covers most of the disc. the only part not covered is a few mm of the outer end of the disc(not the inner) i'll take a picture in the morning.

not sure what the standard size is for the caliper... it was fitted by AmD so i'd assume they are mounted correctly.

thats a good point about ducting!!...

 

[james walker]

hmmh, should cover all the outer disc and leave a small amount of the inner disc uncovered... what pads did you fit.. were they rears for the porsche setup?

what porsche calipers do you use 996 rears? could be binding slightly as i thought 996 rears only took 325x25mm discs as a maximum?

 

[volvic]

part number is 996.351.425/6 which i believe are boxster s fronts with porsche pads

here are a few pics! (bumped into jonjay at AmD after a quick look it seems to be normal)

this seems VERY close, i dont think its rubbing as the top surface isn't clean

 

[james walker]

porsche textar pads?? bin them mate, i had them on and they were shite... go for the ds2500s in the porsche calipers and bingo.

 

[volvic]

unfortunately the disc is rubbing the caliper!!! you cannot see it in this picture, but i went out tonight with a friend, pulled up into a petrol station to see metal filings built up at the top. only the front left does this.

does anyone know if anything can be adjusted? ideally the caliper needs to be moved out at least 1cm on each side. could be this faulty carriers?

 

[billman]

I suppose that it's a problem of the carriers. You should get new carriers.

 

[Willie]

To allow the 330mm discs to fit my Brembo caliper Bill has made a spacer plate to make roon for these

 

[UncleFester]

The bolts that go through the calipers to the carrier are very long, adding a 1 or even a 2mm spacer would probably move the bolts out by only one thread at the most. From memory, mine didn't do this and I was using the same calipers as you but the carriers were supplied by Awesome and never gave me that problem, i ws also only using a 312mm disc. It might be that the discs themselves are physically a little larger than advertised.