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 Brake Rotors

  • Rotor Discard Thickness *

30.7 mm

1.21 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

0.013 mm

0.0005 in

  • Rotor Minimum Allowable Thickness After Refinishing

31.08 mm

1.22 in

  • Rotor Thickness-NEW

32.2 mm

1.27 in

Rear Brake Rotors

  • 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

0.013 mm

0.0005 in

  • Rotor Minimum 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 or discard thickness after refinish specifications.