GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Caliper Bore Diameter

42.0 mm

1.654 in

Front Brake Rotors

  • Rotor Diameter

284.5 mm

11.200 in

  • Maximum Lateral Runout

0.080 mm

0.003 in

  • Thickness Variation

0.013 mm

0.0005 in

  • Maximum Scoring

1.52 mm

0.060 in

Front Brake Rotor Thicknesses

  • Minimum Rotor Thickness

25.08 mm

0.987 in

  • Rotor Discard Thickness*

24.7 mm

0.972 in

  • New Rotor Thickness

26.4 mm

1.039 in

Rear Caliper Bore Diameter

38.1 mm

1.500 in

Rear Brake Rotors

  • Rotor Diameter

278.0 mm

10.945 in

  • Maximum Lateral Runout

0.080 mm

0.003 in

  • Thickness Variation

0.013 mm

0.0005 in

  • Maximum Scoring

1.52 mm

0.060 in

Rear Brake Rotor Thicknesses

  • Minimum Rotor Thickness

9.78 mm

0.385 in

  • Rotor Discard Thickness*

9.40 mm

0.370 in

  • New Rotor Thickness

11.00 mm

0.433 in

Important: All brake rotors have a discard dimension cast into them. Replace any rotor that does not meet this specification. After refinishing the rotor, replace any rotor that does not meet the maximum or minimum thickness after refinish specifications.