DeVille d Elegance V8-4.6L VIN Y (1998)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Tolerance
In manufacturing the brake rotor, tolerances of the braking surfaces for flatness, parallelism and lateral runout are closely maintained. The maintenance
of close tolerances on the shape of the braking surfaces is necessary to prevent brake roughness or pulsation.
In addition to these tolerances, the surface finish must be maintained to a specified range, 60 Ra roughness or less. A new rotor falls into this surface
finish range, as will a rotor that is refinished exactly as directed in Refinishing the Brake Rotors. The control of the braking surface finish is necessary to
avoid problems of hard pedal apply, excessive brake fade, pulls and erratic performance. In addition, control of the surface finish can improve brake pad
life.
Light scoring of the rotor surfaces not exceeding 1.5 mm (0.060 inch) in depth is not detrimental to brake operation, and may result from normal use.
