Vibrating brakes

Brakes will vibrate when the brake rotor (discs) are warped - out of round. They need to be measured for thickness, verified that the thickness is at a safe level, and then if so machined to a "true" finish. Rear discs or drums depending on how your car is equipped have the same need, but you most often feel the vibration from the front brakes....feel that one in your steering wheel too.