Disc Brake Component Specifications

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Application	Specification
Application	Metric	English
Front Brakes J41/JM4
Brake Pad Lining Minimum Thickness	1.0 mm	0.039 in
Brake Pad Lining Thickness - New	12.0 mm	0.472 in
Brake Rotor Diameter, 4 Stud J41/JM4	256.00 mm	10.079 in
Brake Rotor Diameter, 5 Stud JM4	280.00 mm	11.024 in
Brake Rotor Discard Thickness*	22.0 mm	0.87 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 in
Brake Rotor Minimum Allowable Thickness After Refinish	22.75 mm	0.896 in
Brake Rotor Thickness - New	23.69 mm	0.933 in
Front Brakes JL9 (With LNF)
Brake Rotor Diameter	315.5 mm	12.421 in
Brake Rotor Discard Thickness*	24.0 mm	0.945 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 in
Brake Rotor Minimum Allowable Thickness After Refinish	24.2 mm	0.952 in
Brake Rotor Thickness - New	26.0 mm	1.023 in
Front Brakes JL9 (Without LNF)
Brake Rotor Diameter	296.00 mm	11.653 in
Brake Rotor Discard Thickness*	22.8 mm	0.898 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 in
Brake Rotor Minimum Allowable Thickness After Refinish	23.0 mm	0.906 in
Brake Rotor Thickness - New	26.0 mm	1.023 in
Rear Brakes JL9 (With LNF)
Brake Rotor Diameter	292.0 mm	11.496 in
Brake Rotor Discard Thickness*	18.0 mm	0.709 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 in
Brake Rotor Minimum Allowable Thickness After Refinish	18.2 mm	0.717 in
Brake Rotor Thickness - New	19.9 mm	0.783 in
Rear Brakes JL9 (Without LNF)
Brake Rotor Diameter	270.0 mm	10.630 in
Brake Rotor Discard Thickness*	11.8 mm	0.465 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 in
Brake Rotor Minimum Allowable Thickness After Refinish	12.0 mm	0.472 in
Brake Rotor Thickness - New	14.0 mm	0.551 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.