Rear

REAR

ROTOR MINIMUM THICKNESS

Minimum usable thickness of a solid rear disc brake rotor is 12.5 mm (0.492 in.) and for a vented rear disc brake rotor is 20.5 mm (0.807 in.). The thickness specification is located on the center of the rotor.

Never resurface a rotor if machining would cause thickness to fall below this limit.

Measure rotor thickness at the center of the brake shoe contact surface. Replace the rotor if worn below minimum thickness, or if refinishing would reduce thickness below the allowable minimum.

REAR ROTOR THICKNESS VARIATION

NOTE: Vented rotor shown, solid rotor similar.





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 19 mm (3/4 in.) from the rotor outer circumference for each measurement.

Thickness should not vary by more than 0.012 mm (0.0005 in.) 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 to check lateral runout. Maximum allowable lateral runout is 0.05 mm (0.0019 in.).