Disc Brake Component Specifications

Application	Specification
Application	Metric	English
Brake Pad - Front and Rear
Friction Material Minimum Thickness - JL9, J56	0.76mm	0.030in
Friction Material Minimum Thickness - J57	2.0mm	0.078in
Taper - All	0.15mm	0.006in
Front Brake Rotor - JL9 with LFX
Rotor Diameter	321.0mm	12.638in
Rotor Discard Thickness*	27.0mm	1.063in
Rotor Maximum Allowable Assembled Lateral Runout	0.06mm	0.002in
Rotor Maximum Allowable Scoring	1.50mm	0.059in
Rotor Maximum Allowable Thickness Variation	0.025mm	0.001in
Rotor Thickness - New	30.0mm	1.181in
Front Brake Rotor - JL9 with L99, LS3
Rotor Diameter	355.0mm	13.976in
Rotor Discard Thickness*	30.0mm	1.181in
Rotor Maximum Allowable Assembled Lateral Runout	0.06mm	0.002in
Rotor Maximum Allowable Scoring	1.50mm	0.059in
Rotor Maximum Allowable Thickness Variation	0.025mm	0.001in
Rotor Thickness - New	32.0mm	1.259in
Front Brake Rotor - J56
Rotor Diameter	370.0mm	14.567in
Rotor Discard Thickness*	32.0mm	1.259in
Rotor Maximum Allowable Assembled Lateral Runout	0.09mm	0.003in
Rotor Maximum Allowable Scoring	1.50mm	0.059in
Rotor Maximum Allowable Thickness Variation	0.025mm	0.001in
Rotor Thickness - New	34.0mm	1.338in
Front Brake Rotor - J57
Rotor Diameter	394.0mm	15.512in
Rotor Discard Thickness*	35.5mm	1.398in
Rotor Discard Weight**	Indicated on Carrier Section of Rotor
Rotor Maximum Allowable Assembled Lateral Runout	0.1mm	0.004in
Rotor Maximum Allowable Scoring	0.00mm	0.00in
Rotor Maximum Allowable Thickness Variation	0.02mm	0.0008in
Rotor Thickness - New	36.0mm	1.417in
Rear Brake Rotor - JL9 with L99, LFX
Rotor Diameter	315.0mm	12.402in
Rotor Discard Thickness*	21.5mm	0.846in
Rotor Maximum Allowable Assembled Lateral Runout	0.06mm	0.002in
Rotor Maximum Allowable Scoring	1.50mm	0.059in
Rotor Maximum Allowable Thickness Variation	0.025mm	0.001in
Rotor Thickness - New	23.0mm	0.906in
Rear Brake Rotor - JL9, with LS3, J56
Rotor Diameter	365.0mm	14.370in
Rotor Discard Thickness*	26.0mm	1.023in
Rotor Maximum Allowable Assembled Lateral Runout	0.06mm	0.002in
Rotor Maximum Allowable Scoring	1.50mm	0.059in
Rotor Maximum Allowable Thickness Variation	0.025mm	0.001in
Rotor Thickness - New	28.0mm	1.102in
Rear Brake Rotor - J57
Rotor Diameter	390.0mm	15.354in
Rotor Discard Thickness*	31.5mm	1.240in
Rotor Discard Weight**	Indicated on Carrier Section of Rotor
Rotor Maximum Allowable Assembled Lateral Runout	0.1mm	0.004in
Rotor Maximum Allowable Scoring	0.00mm	0.00in
Rotor Maximum Allowable Thickness Variation	0.02mm	0.0008in
Rotor Thickness - New	32.0mm	1.259in
* Each disc brake rotor is marked with a minimum thickness dimension. Replace any rotor that does not meet the minimum thickness dimension. **Each disc brake rotor is marked with a unique discard weight. The weight is indicated on the carrier section of the brake rotor, and can vary for each rotor in an axle set.