Calipers

1. Clean all metal parts with isopropyl alcohol. Then, clean out and dry the grooves and passageways with compressed air. Ensure that caliper bore and component parts are thoroughly clean.

2. Check the cylinder bore and wheel cylinder piston (2196) for damage or excessive wear. Replace the wheel cylinder piston if it is pitted, scored, corroded, or the plating is worn off.

Brake Shoes and Lining

Inspect brake shoe and lining (2001) for wear. If lining is worn to within 1.0mm (.040 inch) of shoe, replace all four brake shoe and lining assemblies (complete axle set) on front or rear wheels as appropriate.

Rotor

Brake pulsation (brake roughness) that is present during brake application is caused by either foreign material build-up or contamination on the rotor brake surface or uneven rotor thickness.

If there is a foreign material build-up or contamination found on front disc brake rotor or lining surfaces, hand sand linings and front disc brake rotors.

Uneven front disc brake rotor thickness (thickness variation) may be caused by the following:

• Front disc brake rotor lateral runout in excess of 0.05mm (0.002 inch) when front disc brake rotor is mounted on wheel hub.
• Front disc brake caliper drag.
• Abrasive action of brake lining.

If brake pulsation (brake roughness) is present, attempt stopping vehicle with transmission in the NEUTRAL position. If the pulsation (roughness) is gone, the drivetrain should be inspected. If pulsation (roughness) remains, stop vehicle from 48 km/h (30mph) using parking brake. If pulsation remains, inspect rear brakes. If pulsation is gone, inspect front brakes.

NOTE: Minor scoring or buildup of lining material does not require machining or replacement of front disc brake rotor.

Hand sand glaze from both rotor braking surfaces using garnet paper 100A (medium grit) or aluminum oxide 150J (medium).