Brake judder
Thread Starter
7th Gear
Joined: May 2001
Posts: 7
Likes: 0
From: England
Brake judder
I have slight brake judder under light braking. (pedal pulse)
I have just fitted new front rotors and pads hoping this would fix things.
Unfortunately the problem is still there.
Is it possible to have brake judder caused by the back brakes ( I have never heard of them warping on other cars)
Is it possible I have made some mistake fitting the rotors?
Any ideas?
:confused:
I have just fitted new front rotors and pads hoping this would fix things.
Unfortunately the problem is still there.
Is it possible to have brake judder caused by the back brakes ( I have never heard of them warping on other cars)
Is it possible I have made some mistake fitting the rotors?
Any ideas?
:confused:
Drifting
Joined: May 2001
Posts: 1,295
Likes: 2
From: Surprise Arizona
Re: Brake judder (AlanBirch)
Do you mean the peddle pulsing back aginst your foot? If so the most common cause is a warped Front rotor. I would take all 4 in and have them trued. The shop wont take off any metel if they dont need it. Next I would make sure all the front suspension components are in good order. Tie rods, ball joints A-arm bushings. There should be no free play in any of these parts. Ball joints are best checked with the car suspended by the lower A-frame as close to the ball joint as possible. Then try to pry the joint around looking for play in the socket. I f any play replace them. Tie rod ends also should be fairly stiff. If they are loose replace them. Worn steering and suspension components usually show up as poor tire wear or shaking in the steering wheel. How many miles on the car?
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Brake judder (Paul G)
Yes, the rear rotors can warp, and yes, the rear rotors can cause the brake pedal to pulse upon stopping. New rotors in the front should obviate the front as the source, so I would have the rear rotors turned to true them up by someone that knows what he is doing. Many techs machine too much off the rotors. One or two thousandths per cut is all that should be taken off to get them back parallel. Out of round tires will do the same thing, but not as pronounced as warped rotors.
Advanced
Joined: Jul 2001
Posts: 75
Likes: 0
Re: Brake judder (jfb)
I agree...get the rotors turned. i had a different vehicle that had the same problem...stab the brakes hard...no problem. Touch the brakes lightly...wobbly feeling. Turned the rotors and all is good.
[Modified by RED90SIXLT1, 5:43 PM 8/15/2001]
[Modified by RED90SIXLT1, 5:43 PM 8/15/2001]
Safety Car
Joined: Apr 1999
Posts: 4,623
Likes: 2
From: Ohio
Re: Brake judder (AlanBirch)
Alan, first off, were the wheels properly torqued after the front brake job? If they were not (ie, too tight, and unevenly torqued) that can definitely cause rotor warpage on new rotors. If you are not sure, jack the car up, loosen the lug nuts and re-torque them using a torque wrench. If it's still there, check the runout on the front and rears. I highly doubt that the rears are warped. I ran the snot out of stock rears using Perf Friction 93 compound race pads and never warped them. ( I have since gone to 13" rear rotors and large calipers in the rear) If ever the rears or *any* of your rotors are worn, or warped throw them away. It's not worth the time, money and agrevation to have them turned, only to have them warp again as soon as they get hot for the first time afterwards. It's false economy. If the fronts continue to seem warped and your pedal persists in pulsing, I would return to the shop that did the work and have them prove to you why the rotors or their work is not at fault. A properly done brake job should yield you a solid, smooth stopping car. (and therefore) pedal.
Racer
Joined: Apr 2001
Posts: 413
Likes: 0
From: glendale Arizona
Re: Brake judder (AlanBirch)
I had the same problem on my 89 roadster, was replacing the rear pads and thought why not have the disc checked, local machine is close so did so and was totally shocked as to how much the disc were warped, replaced disc and all is well now.
traxx1 :seeya
traxx1 :seeya
