Disc Brake Component Specifications

Application	Specification
Application	Metric	English
Front Brake Rotor JL9
Rotor Diameter	321.0 mm	12.60 in
Rotor Discard Thickness*	28.0 mm	1.10 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
Rotor Thickness - New	30.0 mm	1.18 in
Front Brake Rotor J55
Rotor Diameter	345.0 mm	13.50 in
Rotor Discard Thickness*	27.0 mm	1.06 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
Rotor Thickness - New	30.0 mm	1.18 in
Front Brake Rotor J56
Rotor Diameter	370.0 mm	14.57 in
Rotor Discard Thickness*	32.0 mm	1.26 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
Rotor Thickness - New	34.0 mm	1.34 in
Front Brake Rotor J57
Rotor Diameter	394.0 mm	15.51 in
Rotor Discard Thickness	35.5 mm	1.40 in
Rotor Discard Weight**	Indicated on Carrier Section of Rotor
Rotor Maximum Allowable Assembled Lateral Runout	0.1 mm	0.004 in
Rotor Maximum Allowable Scoring	0.00 mm	0.00 in
Rotor Maximum Allowable Thickness Variation	0.02 mm	0.0008 in
Rotor Thickness - New	36.0 mm	1.42 in
Rear Brake Rotor JL9, J55
Rotor Diameter	339.0 mm	13.30 in
Rotor Discard Thickness*	24.0 mm	0.94 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
Rotor Thickness - New	26.0 mm	1.02 in
Rear Brake Rotor J56
Rotor Diameter	365.0 mm	14.37 in
Rotor Discard Thickness*	24.0 mm	0.94 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
Rotor Thickness - New	26.0 mm	1.02 in
Rear Brake Rotor J57
Rotor Diameter	390.0 mm	15.35 in
Rotor Discard Thickness	31.5 mm	1.24 in
Rotor Discard Weight**	Indicated on Carrier Section of Rotor
Rotor Maximum Allowable Assembled Lateral Runout	0.1 mm	0.004 in
Rotor Maximum Allowable Scoring	0.00 mm	0.00 in
Rotor Maximum Allowable Thickness Variation	0.02 mm	0.0008 in
Rotor Thickness - New	32.0 mm	1.26 in
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.