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Pulsating Brake Pedal

A brake pedal that pulses up and down during normal braking usually means warped or unevenly worn brake discs. A rapid buzz only in hard stops on slippery roads is normal ABS action.

Normal risk

Have it checked soon. Uneven discs reduce braking comfort and can lengthen stopping distance.

Short answer · Why does my brake pedal pulse?

When brake discs develop uneven thickness or deposits, the pads move in and out as the disc turns, which you feel as a pulse in the pedal and sometimes the steering wheel. ABS also pulses the pedal, but only when a wheel is about to lock, for example on ice or in an emergency stop. Pulsing on every normal stop is not ABS.

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Safe checks you can do

  1. Note when it happensIn every normal stop: discs. Only in hard stops on slippery roads: ABS.
  2. Check if the steering shakesShake in the steering wheel points to the front discs.
  3. Check the ABS lightIf it is on, ABS may be activating incorrectly.

Questions that narrow it down

  1. Is it worse from high speed?Typical of uneven discs.
  2. Were the wheels recently fitted?Uneven wheel nut torque can distort discs.
  3. Is the ABS light on?Read the codes.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Uneven disc thicknessOften called warped discs.
  2. Pad material depositsAfter hard stops and holding the brake.
  3. Uneven wheel nut torqueDistorts the disc.
  4. Worn suspension partsMake the pulse stronger.
  5. ABS actionNormal on slippery roads.

Questions about Pulsating Brake Pedal

Can the discs be machined?

Sometimes, if they stay above minimum thickness; often they are replaced with new pads.

Is a pulsing pedal dangerous?

It is a sign of wear and can lengthen stopping distance. Have it checked.