System Specifications

FRONT BRAKE ROTOR/DISC

Front Brakes (RPO code JM4 - Power, Front Disc, Rear Drum, Cast Iron, Antilock, Front and Rear Wheel)

MINIMUM & DISCARD THICKNESS
Brake Rotor Discard Thickness* 22.8 mm (0.898 in)
Brake Rotor Minimum Allowable Thickness After Refinish 23.0 mm (0.906 in)

THICKNESS VARIATION/RUNOUT
Brake Rotor Maximum Allowable Assembled Lateral Runout 0.06 mm (0.002 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)

Front Brakes (RPO code JL9 - Power, Front and Rear Disc, Antilock, Front and Rear Wheel)

MINIMUM & DISCARD THICKNESS
Brake Rotor Discard Thickness* 22.8 mm (0.898 in)
Brake Rotor Minimum Allowable Thickness After Refinish 23.0 mm (0.906 in)

THICKNESS VARIATION/RUNOUT
Brake Rotor Maximum Allowable Assembled Lateral Runout 0.06 mm (0.002 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)

REAR BRAKE ROTOR/DISC

Rear Brakes (RPO code JL9 - Power, Front and Rear Disc, Antilock, Front and Rear Wheel)

MINIMUM & DISCARD THICKNESS
Brake Rotor Discard Thickness* 11.8 mm (0.465 in)
Brake Rotor Minimum Allowable Thickness After Refinish 12.0 mm (0.472 in)

THICKNESS VARIATION/RUNOUT
Brake Rotor Maximum Allowable Assembled Lateral Runout 0.06 mm (0.002 in)
Brake 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 specification.

Brake Drum (RPO code JM4 - Power, Front Disc, Rear Drum, Cast Iron, Antilock, Front and Rear Wheel)

Brake Drum Maximum Diameter After Refinish 230.1 mm (9.059 in)
Brake Drum Discard Diameter 230.6 mm (9.079 in)
Brake Drum Maximum Allowable Radial Runout 0.09 mm (0.004 in)