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Brake Rotor/Disc|Testing and Inspection > < GM Brake Service Procedure|Page 9084
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Brake Rotor/Disc: Specifications

Front Brakes

Rotor Thickness - NEW .....................................................................................................................................................................  32.2 mm (1.27 inch)
Rotor Discard Thickness *  ................................................................................................................................................................  30.7 mm (1.21 inch)
Rotor Maximum Allowable Assembled Lateral Runout ..................................................................................................................  0.06 mm (0.002 inch)
Rotor Maximum Allowable Scoring ................................................................................................................................................  1.50 mm (0.059 inch)
Rotor Maximum Allowable Thickness Variation ..........................................................................................................................  0.025 mm (0.001 inch)
Rotor Minimum Allowable Thickness After Refinish .....................................................................................................................  31.08 mm (1.22 inch)

Rear Brakes

Rotor Thickness - NEW ...................................................................................................................................................................  12.0 mm (0.472 inch)
Rotor Discard Thickness * ...............................................................................................................................................................  10.5 mm (0.413 inch)
Rotor Maximum Allowable Assembled Lateral Runout ..................................................................................................................  0.06 mm (0.002 inch)
Rotor Maximum Allowable Scoring ................................................................................................................................................  1.50 mm (0.059 inch)
Rotor Maximum Allowable Thickness Variation ..........................................................................................................................  0.025 mm (0.001 inch)
Rotor Minimum Allowable Thickness After Refinish .....................................................................................................................  10.8 mm (0.425 inch)

*

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.

Brake Rotor/Disc|Testing and Inspection > < GM Brake Service Procedure|Page 9084