Tolerances of the braking surfaces for the following conditions are held closely during the manufacture of the brake rotor:

The maintenance of close tolerances on the shape of the braking surfaces is necessary in order to prevent brake roughness or pulsation. The braking surface finish must be held to a specific range of a 50 Ra roughness or less. Control of the braking surface finish will eliminate the following problems:

Control of the braking surface finish may improve lining life.

Light scoring of the rotor surfaces, not exceeding 1.5 mm (0.06 in) in depth, is not detrimental to brake operation. Normal brake use may cause light scoring.