GM Service Manual Online
For 1990-2009 cars only

General Specifications

Application

Specification

Metric

English

Front Brakes

  • Rotor Discard Thickness *

27.5 mm

1.08 in

  • Rotor Thickness (new)

29.0 mm

1.14 in

  • Rotor Maximum Allowable Lateral Runout

0.051 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

Rear Brakes

  • Rotor Discard Thickness *

18.50 mm

0.728 in

  • Rotor Minimum Allowable Thickness After Refinish

19.90 mm

0.783 in

  • Rotor Thickness (new)

20.0 mm

0.787 in

  • Rotor Maximum Allowable Lateral Runout

0.051 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

* 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.