C 2500 Truck 2WD V8-5.7L VIN R (1997)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Tolerance
During the manufacture of the brake rotor, tolerances of the braking surfaces for flatness, parallelism and lateral runout are closely held. 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 held to a specified range of 60 Ra roughness or less. 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 lining life. Light scoring of
the rotor surfaces not exceeding 1.5 mm (0.06 inch) in depth is normal and not detrimental to brake operation.
