In a motor vehicle, when the brake pedal is depressed, brake fluid is sent to the brake calipers, which straddle the disc in a disc-brake assembly. This creates hydraulic pressure, which, in turn, squeezes the brake rotor in between the brake pads.

Symptoms

Symptoms of brake chatter can range from the grabbing of the brakes and slight vibration at low speeds to more violent shaking.

Causes

Brake chatter can occur if the brake rotor is warped, if the lining of the brake pads is contaminated with oil or brake fluid or if the brake linings move slightly.