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Guys, what causes a vibration when braking? Had brake judder problem when braking at high speeds(60MPH or so). Replaced front rotors and brake pads, problem went away. Old Front rotors were smooth btw. Also replaced back rotors and pads, right rear rotor was grooved, left was smooth. But a month later, brake judder or vibration has returned when braking at high or low speeds. Any ideas on what could be wrong, thanks in advance, Jim
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I’d guess your rotors are warped again. I happened to buy a car with large diameter OEM rotors. Rotor warping on this particular model is unheard of. The larger the rotor the more heat it can absorb and dissipate. This tells me that the rotors on most vehicles are smaller than adequate.
If warped, since they are new, there shouldn’t be any problem with having them turned.
Everyone could do what they would consider to be the “perfect brake job”… but even with brand new pads and rotors it’s stil a good possibility to develop brake pulsation. This is due to “stacked tolerances” between the steering knuckle, wheel hub, and the rotor being out of spec. So.. there are a couple of things that can be done to correct “lateral runnout:”
- Cut your brand new rotors out of the box with an “on-the-car” brake lathe. This will cut the rotor specific to the hub, on that specific wheel, of your specific vehicle.
- Use a ‘spacer’ to bring the runnout within spec:
No one ever uses a dial indicator on their rotors. Every DIY’er who has ever ‘pad-slapped’ has never done a proper brake job because they have never measured runnout; most people do not even know what a dial indicator is.
**The tolerances for lateral runnout are among the tightest tolerances on an automobile** If there is any room for forgiveness… it is measured in thousandths of an inch.
So, you can either correct for lateral runnout, or continue to cut your rotors every month.
The early 2000’s accords and Acuras had slightly undersized rotors which tend to warp under heavy braking. You either have to move to a less hilly region, use your brakes less, learn to love a little shaking, or put on heftier rotors.
see if this helps. what brand rotors did you use?
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