Disc Brake Component Specifications

WARNING: This page is about a different car, the 2012 GMC Sierra, 2012 GMC Cab & Chassis Sierra, 2012 Chevrolet Silverado, and 2012 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Application	Specification
Application	Metric	English
Front Brakes J92, JD9, JF3, JF7
Rotor Discard Thickness*	28.0 mm	1.102 in
Rotor Minimum Allowable Thickness After Refinish	28.5 mm	1.122 in
Rotor Thickness (new)	30.0 mm	1.181 in
Rotor Maximum Allowable Assembled Lateral Runout	0.05 mm	0.002 in
Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Rotor Maximum Allowable Thickness Variation	0.018 mm	0.0007 in
Front Brakes J90, J95, J96
Rotor Discard Thickness*	38.50 mm	1.516 in
Rotor Minimum Allowable Thickness After Refinish	39.0 mm	1.535 in
Rotor Thickness (new)	40.0 mm	1.575 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
Rear Brakes J92, JD9
Rotor Discard Thickness*	18.5 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 Assembled Lateral Runout	0.05 mm	0.002 in
Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Rotor Maximum Allowable Thickness Variation	0.018 mm	0.0007 in
Rear Brakes J90, J96
Rotor Discard Thickness*	38.50 mm	1.516 in
Rotor Minimum Allowable Thickness After Refinish	39.0 mm	1.535 in
Rotor Thickness (new)	40.0 mm	1.575 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
Rear Brakes J95
Rotor Discard Thickness*	32.50 mm	1.280 in
Rotor Minimum Allowable Thickness After Refinish	33.0 mm	1.299 in
Rotor Thickness (new)	34.0 mm	1.339 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
* 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.