GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brakes JC5/JH5

  • Rotor Discard Thickness *

27.50 mm

1.083 in

  • Rotor Minimum Allowable Thickness After Refinish

28.0 mm

1.102 in

  • Rotor Thickness (new)

29.0 mm

1.142 in

  • Rotor Maximum Allowable 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

0.0001 in

Front Brakes JH6

  • Rotor Discard Thickness *

36.50 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 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

Front Brakes JH7

  • Rotor Discard Thickness *

36.50 mm

1.437 in

  • Rotor Minimum Allowable Thickness After Refinish

37.0 mm

1.46 in

  • Rotor Thickness (new)

38.0 mm

1.50 in

  • Rotor Maximum Allowable 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 JC5/JH5 Pickup

  • Rotor Discard Thickness *

18.50 mm

0.728 in

  • Rotor Minimum Allowable Thickness After Refinish

19.0 mm

0.748 in

  • Rotor Thickness (new)

20.0 mm

0.787 in

  • Rotor Maximum Allowable 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 JC5/JH5 Utility

  • Rotor Discard Thickness *

28.50 mm

1.122 in

  • Rotor Minimum Allowable Thickness After Refinish

29.0 mm

1.142 in

  • Rotor Thickness (new)

30.0 mm

1.181 in

  • Rotor Maximum Allowable 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 JH6

  • Rotor Discard Thickness *

27.50 mm

1.083 in

  • Rotor Minimum Allowable Thickness After Refinish

28.0 mm

1.102 in

  • Rotor Thickness (new)

29.0 mm

1.142 in

  • Rotor Maximum Allowable 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

0.001in

Rear Brakes JH7

  • Rotor Discard Thickness *

28.5 mm

1.122 in

  • Rotor Minimum Allowable Thickness After Refinish

29.0 mm

1.142 in

  • Rotor Thickness (new)

30.0 mm

1.181 in

  • Rotor Maximum Allowable 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

* 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.