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Brake Rotor/Disc|Testing and Inspection > < GM Brake Service Procedure|Page 14025
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Brake Rotor/Disc: Specifications

Disc Brake Component Specifications

 
Front Brake Rotors

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Rotor Discard Thickness * ...........................................................................................................................................................  30.7 mm (1.21 inch)

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Rotor Maximum Allowable Lateral Runout ..............................................................................................................................  0.06 mm (0.002 inch)

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Rotor Maximum Scoring ...........................................................................................................................................................  1.50 mm (0.059 inch)

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Rotor Maximum Allowable Thickness Variation ....................................................................................................................  0.025 mm (0.001 inch)

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Rotor Minimum Allowable Thickness After Refinishing ............................................................................................................  31.0 mm (1.22 inch)

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Rotor Thickness-NEW .................................................................................................................................................................  32.2 mm (1.27 inch)

Rear Brake Rotors

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Rotor Discard Thickness * ...........................................................................................................................................................  12.5 mm (0.49 inch)

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Rotor Maximum Allowable Lateral Runout ..............................................................................................................................  0.05 mm (0.002 inch)

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Rotor Maximum Scoring ...........................................................................................................................................................  1.50 mm (0.059 inch)

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Rotor Maximum Allowable Thickness Variation ......................................................................................................................  0.02 mm (0.001 inch)

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Rotor Minimum Thickness After Refinishing ..............................................................................................................................  12.9 mm (0.51 inch)

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Rotor Thickness-NEW .................................................................................................................................................................  14.0 mm (0.55 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 specification.

Brake Rotor/Disc|Testing and Inspection > < GM Brake Service Procedure|Page 14025