GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brakes:

  • Caliper Bore Diameter

63.5 mm

2.500 in

  • Rotor Diameter

278.0 mm

10.945 in

  • Rotor Discard Thickness (Refer to Note)

30.7 mm

1.21 in

  • Rotor Maximum Lateral Runout

0.080 mm

0.003 in

  • Rotor Maximum Scoring

1.50 mm

0.059 in

  • Rotor Maximum Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Thickness After Refinish

31.08 mm

1.22 in

  • Rotor Minimum Wear Stock

1.0 mm

0.039 in

  • Rotor Thickness (new)

32.2 mm

1.27 in

Rear Brakes:

  • Caliper Bore Diameter

38.1 mm

1.500 in

Rotor Diameter

278.0 mm

10.945 in

  • Rotor Discard Thickness (Refer to Note)

9.0 mm

0.35 in

  • Rotor Maximum Lateral Runout

0.080 mm

0.003 in

  • Rotor Maximum Scoring

1.50 mm

0.059 in

  • Rotor Maximum Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Thickness After Refinish

10.0 mm

0.39 in

  • Rotor Minimum Wear Stock

1.6 mm

0.06 in

  • Rotor Thickness (new)

11.0 mm

0.43 in

Note: 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 minimum thickness after refinish specifications.