GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brake Rotors - With LS4

  • Rotor Discard Thickness *

28.6 mm

1.26 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 Refinishing

28.72 mm

1.31 in

  • Rotor Thickness - New

30.0 mm

1.181 in

Front Brake Rotors - Without LS4

  • 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 Refinishing

31.0 mm

1.22 in

  • Rotor Thickness - New

32.2 mm

1.27 in

Rear Brake Rotors - With LS4

  • Rotor Discard Thickness *

9.0 mm

0.354 in

  • Rotor Maximum Allowable Assembled 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 Refinishing

9.35 mm

0368 in

  • Rotor Thickness - New

11.0 mm

0.433 in

Rear Brake Rotors - Without LS4

  • Rotor Discard Thickness *

12.5 mm

0.49 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 Refinishing

12.9 mm

0.51 in

  • Rotor Thickness - New

14.0 mm

0.55 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.