Rear

DIAGNOSIS AND TESTING - DISC BRAKE ROTORS

REAR ROTOR MINIMUM THICKNESS





Minimum usable thickness of the rear disc brake rotor is 0.299 in. (7.6 mm). The thickness specification is located on the center section of the rotor.
Never resurface a rotor if at minimum thickness. Machining the rotor would cause the thickness to fall below the limit.
Measure rotor (2) thickness at the center of the brake pad contact surface using a micrometer (1). Replace the rotor if worn below minimum thickness, or if refinishing would reduce thickness below the allowable minimum.

REAR ROTOR THICKNESS VARIATION
Variations in rotor thickness will cause pedal pulsation, noise and shudder.
Measure rotor thickness at a minimum of six points around the rotor face. Position the micrometer approximately 3/4 in. (19 mm) from the rotor outer circumference for each measurement.
Thickness should not vary by more than 0.0005 in. (0.0127 mm) from point to point on the rotor. Refinish or replace the rotor if necessary.

REAR ROTOR LATERAL RUNOUT





Check rotor lateral runout whenever diagnosis indicates pedal pulsation and rapid, uneven brake lining wear.
The rotor must be securely clamped to the hub to ensure an accurate runout measurement. Secure the rotor with the wheel nuts and 4 or 5 large diameter flat washers on each stud.
Use a dial indicator (1) to check rotor lateral runout. Maximum allowable lateral runout is 0.003 in. (0.76 mm).