Brake Bedding
The process of wear-in for new brake pads and rotors to ensure even pad material transfer and optimal braking.
Brake bedding (also known as pad burnishing) is the process of breaking in new brake pads and rotors to optimize braking performance and extend component life. Bedding involves performing a series of controlled stops from moderate speeds without coming to a complete stop, which heats up the brake components and transfers a thin, uniform layer of friction material from the pads onto the rotor surface.
This layer of transferred material is crucial because modern brakes rely on 'adherent friction' (brake pad material sticking to the brake pad material on the rotor) for smooth and efficient stopping. Proper bedding ensures that the pad face matches the rotor surface perfectly, maximizing contact area and preventing hot spots that lead to warped rotors.
If new brakes are not properly bedded, the pad material can transfer unevenly, creating high spots on the rotor surface. Over time, this leads to thickness variation in the rotor, resulting in brake squeal and pedal pulsation (vibration) during stopping. Most pad manufacturers provide specific bedding guidelines, such as making 5 to 10 slow-downs from 45 mph to 10 mph using moderate brake pressure.