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Clunk when braking

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wrxtony57

Posts : 137
Reputation : 3
Join date : 2010-08-30
Location : Middlesbrough

Clunk when braking

Post  wrxtony57 on Tue Apr 05, 2011 8:18 pm

Ok,
Had a clunk when braking for a while now, hence the new discs and pads allround to get rid of it, BUT still got it.

It only happens once each drive and only after either using the handbrake and/or after reversing.(Oh, and the brakes squeal when reversing!)
After which, the first time I brake I get 2 clunks, seemingly 1 form either rear side of the car.

The calipers seem free and the handbrake seems free too???
It's really bugging me now.

I've looked at the suspension too but the clunks would happen more often if a coil was broke, etc...

I think its the handbrake mechanism still, but can't see a fault on it.

Ideas ???

Rheid

Posts : 138
Reputation : 3
Join date : 2010-01-29
Location : Edinburgh

Re: Clunk when braking

Post  Rheid on Tue Apr 05, 2011 11:55 pm

wrxtony57 wrote:Ok,
Had a clunk when braking for a while now, hence the new discs and pads allround to get rid of it, BUT still got it.

It only happens once each drive and only after either using the handbrake and/or after reversing.(Oh, and the brakes squeal when reversing!)
After which, the first time I brake I get 2 clunks, seemingly 1 form either rear side of the car.

The calipers seem free and the handbrake seems free too???
It's really bugging me now.

I've looked at the suspension too but the clunks would happen more often if a coil was broke, etc...

I think its the handbrake mechanism still, but can't see a fault on it.

Ideas ???

Sounds normal to me. The pads have a bit of float in the caliper and the clunk on direction change is them moving. When you brake going forwards the pads are stopped against the leading edge of the caliper, when you brake in reverse the pads move a little bit and re-seat against the back edge of the caliper and vice versa - that's the 'clunk'.

I also used to get a bit of squeal in reverse, some copperslip on the back of the pads helped.

HTH, Neil
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wrxtony57

Posts : 137
Reputation : 3
Join date : 2010-08-30
Location : Middlesbrough

Re: Clunk when braking

Post  wrxtony57 on Wed Apr 06, 2011 4:34 am

Cheers Neil.
Any more copperslip on them and the world supply would run out! Laughing

I like the change in direction idea, but it is a loud clunk and I've never had it on any car before.
The pads sit nice and tight too so I don't think there would be enough movement to cause a clunk.

I'm tempted to remove the handbrake shoes and try it and see if its quiet!

Rheid

Posts : 138
Reputation : 3
Join date : 2010-01-29
Location : Edinburgh

Re: Clunk when braking

Post  Rheid on Wed Apr 06, 2011 5:10 am

wrxtony57 wrote:Cheers Neil.
Any more copperslip on them and the world supply would run out! Laughing

I like the change in direction idea, but it is a loud clunk and I've never had it on any car before.
The pads sit nice and tight too so I don't think there would be enough movement to cause a clunk.

I'm tempted to remove the handbrake shoes and try it and see if its quiet!

It doesn't take much rotational free play to get the clunk, in fact it kinda has to be there to stop the pads binding in the calipers. My pads also feel like there's no rotational movement but they clunk every time there's a change in direction. My old hawkeye STi was exactly the same - same calipers, same clunk.

I don't get squeal in reverse with the hatch but again the hawkeye did it and I never found a cure. Possibly down to pad compound? IIRC the OEM pad compound changed with the move to the hatch.

Cheers, Neil
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wrxtony57

Posts : 137
Reputation : 3
Join date : 2010-08-30
Location : Middlesbrough

Re: Clunk when braking

Post  wrxtony57 on Wed Apr 06, 2011 10:33 am

ok, well that's good news then.
I've just ordered some new pads for the front just in case my ears are deceiving me and it's the front clunking or squealing.

Then it will be new discs and pads all-round the car.


thompl33

Posts : 59
Reputation : 1
Join date : 2011-09-29

Re: Clunk when braking

Post  thompl33 on Wed Oct 26, 2011 3:15 pm

Sti Brembos clunk from forward to reverse.

When they don't there's something wrong!
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wrxtony57

Posts : 137
Reputation : 3
Join date : 2010-08-30
Location : Middlesbrough

Re: Clunk when braking

Post  wrxtony57 on Thu Oct 27, 2011 1:16 am

Thanks,
New brake pads did the trick in the end. The other ones must have been just a little smaller in length ?? No more clunking.


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