GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

  • Caliper Bore Diameter - Front

63.5 mm

2.50 in

  • Caliper Bore Diameter - Rear

38.1 mm

1.50 in

Front Brakes

  • Rotor Discard Thickness *

30.7 mm

1.21 in

  • Rotor Maximum Allowable 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

31.08 mm

1.22 in

  • Rotor Thickness-NEW

32.2 mm

1.27 in

Rear Brakes

  • Rotor Discard Thickness *

9.0 mm

0.35 in

  • Rotor Maximum Allowable Lateral Runout

0.06 mm

0.002 in

  • Rotor Maximum Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness After Refinish

10.0 mm

0.39 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 specification.