GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brakes JD9

  • Rotor Discard Thickness*

27.5 mm

1.083 in

  • Rotor Minimum Allowable Thickness After Refinish

28.0 mm

1.102 in

  • Rotor Thickness (new)

30.0 mm

1.181 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.009 mm

0.0004 in

Front Brakes JH6

  • Rotor Discard Thickness*

36.5 mm

1.437 in

  • Rotor Minimum Allowable Thickness After Refinish

37.0 mm

1.457 in

  • Rotor Thickness (new)

38.0 mm

1.496 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.13 mm

0.005 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

Rear Brakes JD9

  • Rotor Discard Thickness*

18.0 mm

0.709 in

  • Rotor Minimum Allowable Thickness After Refinish

18.5 mm

0.7282 in

  • Rotor Thickness (new)

20.0 mm

0.787  in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.009 mm

0.0004 in

Rear Brakes JH6

  • Rotor Discard Thickness*

27.5 mm

1.083 in

  • Rotor Minimum Allowable Thickness After Refinish

28.0 mm

1.102 in

  • Rotor Thickness (new)

30.0 mm

1.181  in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.13 mm

0.005 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 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.