Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Brake Rotor/Disc: Testing and Inspection
Rotor Tolerance and Surface Finish
In manufacturing 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 specific range. This range is 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 inches) in depth, which may result from normal use, is not detrimental to brake operation.