MAINTENANCE OF AIR BRAKE SYSTEM - Continued
SERVICE BRAKES - Continued
(h) Remove roller retaining springs (8) and rollers (7) from brake shoe assemblies
(i) Drive out spring pins (11) from brake shoe assemblies (12).
(j) Remove bushings (5) from axle spider (6) if worn.
Dry cleaning solvent (PD-680) used to clean parts is potentially dangerous to personnel and property.
Do not use near open flame or excessive heat. Flash point of dry cleaning solvent is 138F (59C).
Do not allow lubricants or solvents to get on brake shoes.
These materials will do damage to brake linings and result
in poor braking action.
DO NOT use a dry brush or compressed air to clean brakeshoes. There may be dust on brakeshoes
which may be dangerous to your health if you breath it. Dampen surface of lining with water and use
a soft bristle brush.
(a) Clean all parts except brake shoes with a brush and dry cleaning solvent. Air dry.
(b) Clean brake shoes with soft bristle brush.
(a) Inspect brake shoes for wear and scoring. Replace brake shoes if linings are worn
to less than 5/16-inch thick at any place on the linings.
(b) Inspect springs for kinks, corrosion and distortion.
(c) Inspect rollers, anchor pins, spring pins and bushings for wear, corrosion and
(4) Repair. Replace all defective parts.
(a) Install bushings (5) in axle spider (6) if removed.