Chart 1

Good contact is important between the friction surfaces of the brake system. With semi-metallic linings, it is important to have good re-finished rotor surfaces. A poor finish on one rotor can result in reduced brake effectiveness. This may result in a brake lead condition if installed opposite a properly finished rotor.

The original equipment new disc brake rotors have an initial surface finish of 20 to 60 micro-inches and all have a non-directional swirl pattern.