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Brake pad noise ??

Sandy59

Sandy59

PCGB Member
Member
Just wondering if anyone else has this issue :

I recently changed out the PCCB pads on my GT3. This was a fairly straightforward job although the new pads had an additional thin plate over the back of the pad held in place by small spring 'lugs'. The old pads didn't have these but I was advised these were probably for anti squeal so fitted them anyway.
Well first few hundred miles and everything seemed fine, no noise from anywhere on the brakes so pretty happy - apart from the cost of the pads !!
However recently I've noticed a sort of light clunk when I touch the brakes after reversing, and then when going forward again and touching the brakes, normal driving seems to be fine. It seems to me that one or more of the pads is moving slightly inside the caliper, and maybe this extra spring 'lug' might have something to do with it as it actually makes the pad slightly longer in effect.
I've since had a quick look and all seems fine to me, so before I start stripping things down again just wondered if anyone else has any thoughts or experience on this ??
To be honest it doesn't seem like a huge problem, more annoying than anything else.
Cheers,
Sandy


 
I've never heard that noise in a road car but very familiar with it in single seaters that I have run over recent years.

In my case the calipers were at the rear of the front discs and the front of the rear, and as the car was initially rolled one way or another, pads would occasionally lift a little with the disc and then drop back, causing the clunk. Which end depended on which direction.

Of course these were always very clean and no AR shims.
 
Sounds like the extra shims have increased contact pressure on the rotor. This is picking up the pad on change of direction. Don't think it's anything to worry about, but try removing shims to see if this eliminates the problem.
Regards,
Clive
 
Well took out the 'extra' thin plates today and it seems to have done the trick - touch wood !
These plates have an adhesive side which sticks to the caliper pistons, however they do not seem to stick to the pads themselves, so they can move and I believe this movement makes the noise I've been hearing.
That's my theory anyway and I'm sticking to it for now.
Cheers for the thoughts.
 
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