GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brake Rotors

  • Rotor Discard Thickness * RPO Codes L 26, L 32

30.7 mm

1.21 in

  • Rotor Discard Thickness *RPO Code LS 4

29.0 mm

1.14 in

  • Rotor Maximum Allowable Lateral RunoutRPO Code L 26, L 32

0.060 mm

0.002 in

  • Rotor Maximum Allowable Lateral RunoutRPO Code LS 4

0.030 mm

0.0012 in

  • Rotor Maximum Scoring

1.50 mm

0.059 in

Rotor Maximum Allowable Thickness Variation

  • RPO Codes L 26, L 32

0.025 mm

0.001 in

  • RPO Code LS 4

0.006 mm

0.00024 in

Rotor Minimum Allowable Thickness After Refinishing

  • RPO Codes L 26, L 32

31.0 mm

1.22 in

  • RPO Code LS 4

30.0 mm

1.18 in

Rotor Thickness-NEW

  • RPO Codes L 26, L 32

32.2 mm

1.27 in

  • RPO Code LS 4

32.0 mm

1.26 in

Rear Brake Rotors

  • Rotor Discard Thickness *RPO Codes L 26, L 32

12.5 mm

0.49 in

  • Rotor Discard Thickness * RPO Code LS 4

23.0 mm

0.91 in

Rotor Maximum Allowable Lateral Runout

  • RPO Codes L 26, L 32

0.05 mm

0.002 in

  • RPO Codes L 26, L 32

0.0305 mm

0.0012 in

  • Rotor Maximum Scoring

1.50 mm

0.059 in

Rotor Maximum Allowable Thickness Variation

  • RPO Codes L 26, L 32

0.02 mm

0.001 in

  • RPO Code LS 4

0.006 mm

0.00024 in

Rotor Minimum Thickness After Refinishing

  • RPO Codes L 26, L 32

12.9 mm

0.51 in

  • RPO Code LS 4

24.0 mm

0.945 in

Rotor Thickness-NEW

  • RPO Codes L 26, L 32

14.00 mm

0.55 in

  • RPO Codes LS 4

26.00 mm

1.024 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.