Brake pedal pulsates or shimmies when pressed
- Check wheel lug nut torque and tighten evenly to specification.
- Check the brake rotor for trueness and thickness variations. Replace the rotor if it is too thin, warped, or if the thickness varies beyond specification. Some rotors can be machined; consult the manufacturer's specifications and recommendations before using a machined brake rotor.
- Check the brake caliper or caliper bracket mounting bolt torque and inspect for looseness. Torque the mounting bolts and inspect for wear or any looseness, including worn mounting brackets, bushings and sliding pins.
- Check the wheel bearing for looseness. If the bearing is loose, adjust if possible, otherwise replace the bearing.
Before Removing the Brake Rotor from the vehicle it should be tested for warping.
Use a Dial Indicator for checking to see if the rotor is warped. Anything over .003 can be felt as pulsation in the foot pedal as it double when you add the other side of the rotor and then add the opposite rotor. Replace rotor If it reads over .003
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