GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brakes

  • Caliper Bore Diameter

64 mm

2.520 in

  • Rotor Diameter (All Wheel Drive)

300 mm

11.811 in

  • Rotor Diameter (Front Wheel Drive)

275 mm

10.945 in

  • Rotor Discard Thickness*

27.0 mm

1.063 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness After Refinish

28.4 mm

1.118 in

  • Rotor Minimum Wear Stock

1.0 mm

0.039 in

  • Rotor Thickness (new)

30.0 mm

1.181 in

Rear Brakes

  • Caliper Bore Diameter

38.1 mm

1.500 in

  • Rotor Diameter

291.0 mm

11.457 in

  • Rotor Discard Thickness*

9.0 mm

0.35 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness After Refinish

10.3 mm

0.405 in

  • Rotor Minimum Wear Stock

1.6 mm

0.06 in

  • Rotor Thickness (new)

11.0 mm

0.43 in

* 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 specifications.