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What causes brake pulsation?

Brake causes pulsation
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What causes brake pulsation?

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A. Brake pulsation or judder is the result of uneven wear between brake pads and the disc. In order for a car to stop smoothly, the pad and disc must conform to one another so that brake pressure is consistent over the entire contact area. Minor irregularities in contact will result in ‘pedal bounce’, while major inconsistencies will cause the entire car to vibrate. In many cases, uneven contact has been caused by lateral runout.

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