Initial Inspection and Diagnostic Overview

Tolerances of the braking surfaces for the following conditions are held closely during the manufacture of the brake rotor:
^ Flatness
^ Parallelism
^ Lateral runout

The maintenance of close tolerances on the shape of the braking surfaces prevents brake roughness or pulsation. The surface finish must be held to a specified range of a 60 degree radius of roughness or less. A new rotor conforms to the above specifications, as will a correctly refinished rotor. Refer to Refinishing Brake Rotors. Control of the braking surface finish will eliminate the following problems:
^ Hard pedal application
^ Excessive brake fade
^ Pulls
^ Erratic performance

Control of the braking surface finish will improve lining life.
Light scoring of the rotor surfaces not exceeding 1.5 mm (0.060 inch) in depth is not detrimental to brake operation. Normal use may cause light scoring.