Hi,

Any ideas what else could cause judder when on brakes?

I fitted 2nd hand brembos with some pagid race pads, new godspeed disks.

Otherwise ive had the geo set up after altered the caster angle by a fair bit.

Really takes the fun out of driving the car as its so bad.

A right pain in the ***.

Cheers

 

Describe 'judder'? Are the Godspeed discs grooved? Some of the Pagid pads are seriously hard and the noise and feedback through the pedal can be a shock if you aren't used to it.

 

Did you check that none of the caliper piston were seized.

 

Also check for play in balljoints or steering ends

 

I can check check ball joints. Check for play with a bar?

Could to racey pads really cause so much judde and noise? Id replaced the original set off godspeed grooved discs for new grooved ones. Maybe that was not the problem after all.

Best way to check for seized pistons? Dont reall y want to disconnect calipers and rebleed.

Cheers

 

Pop pads out and bress brake gently to move piston should move freely and push back in did you give the hub flange a good clean before fitting disk?

 

Brembo pistons are aluminium so should be ok unless the seals are bad and crap has got inside perhaps? Were they definitely bled properly?

 

Hub was def spotless. Wirebrushed it.

 

Id say they were bleed well. was done by a good mechanic. Wouldnt they be spongey if air in?

 

Maybe not always. Might be worth popping the pads out, opening the bleed nipples and pushing the pistons in. At least you can check if they're seized and if there's any air at the same time.

 

Did you fit new pads and discs or just discs

 

Just discs, I thought Id keep the pagids as theyre worth a fortune and still had loads of life in the pads.

 

Your mail box is full Cubbs.

Defo check all the rubber bushes in the lower arm, ball joints and track rod ends.

 

Another thought, are the pads able to move ok in the calipers? The little guide plates on the caliper can be pushed out by dirt and corrosion behind them, this pinches the pads and they can't move properly.

 

when exactly does the "judder" occur?? under all situations, only when hot, does it vibrate through the pedal or steering wheel??

 

Now you ask, its probably the first hard braking from cold. doesnt seem to get any better when warm but its road driving so not repetitive hard braking. Hard to say. But it doesnt give me much confidence in the brakes.

Would having race pads cause this noise and vibration through the steering wheel?

Cheers

 

Race pads are not as nice to drive with compered to milder pads , when you fitted the new discs and used pads , did you flatten the pads off on a flat surface with emery cloth or sandpaper ?
Pads that have been used on discs , will wear down , they will never wear dead flat , and even more so on a race pad which can have slightly harder area's on them , you will find the discs wear quite uneven , and so will the pads , if you then fit these pads onto a new flat disc damage can occur , so you should always rub the pads down to make sure they are flat again before fitting them onto new discs.

Do you have any blue or black marks on the discs , can you see an outline of a pad shape anywhere on the disc surface ?
The judder you're getting , is it the steering wheel you can feel it , or the brake pedal.

If you go out and give the brakes a caning , does it get any better ?

Cheers Ian

 

Ian,

Theyre really bad. I took the car for a good ragging earlier. Id say theyre worse once hot. Once hot even stamping on brakes at 40mph gives judder.

No colours or marks on disc either.

Cheers

 

Sounds like you need to take the pads out and give everything a good clean, sand the pads flat and make sure everything is moving freely.

Then you'll know it's not anything simple and gives you a base line to start from.

Also look at the discs and see if you can see the outline of the pad on them, looks almost as though someone has drawn around the pad with a pencil, that's what was wrong with mine when I had judder, it's caused by holding your foot on the brake when the pads and discs are really hot, leaves carbon deposits on the disc which then cause the judder, also made worse when the brakes are hot due to expansion.

I did the above stripping and cleaning / re greasing (copper grease) put it all back together then went through the bedding in procedure a few times over the course of a week or so and it cured it.

 

What about this , did you do this or just fit the used pads onto new discs

 

I'll whip the pads out and get them flat first.

Thanks

 

Did you get this sorted?

 

Hi. No not yet.