4-45. FOUNDATION BRAKESHOE AND BRAKEHEAD
CLEANING, INSPECTION, AND REPAIR
Drycleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and
use only in a well-ventilated area. Avoid contact with skin, eyes, and clothes and don't breathe
vapors. Do not use near open flame or excessive heat. The flash point is 100 - 138°F (38 -
59°C). If you become dizzy, get fresh air and medical aid immediately. If contact with eyes is
made, wash your eyes and get medical aid immediately.
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Do not direct
compressed air against skin. Use goggles or full face shield.
Clean parts in drycleaning solvent. Dry with compressed air.
Inspect spring, spacer, and screw for cracks, breaks, and damage.
Repair consists of replacement of damaged parts.
ASSEMBLY AND INSTALLATION
Position brakehead (4) on brake lever (9) and install pins (7) and (8), and cotter pins (5) and (6).
Tilt brakehead (4) up and slide brakeshoe (3) down from top of wheel and into brakehead.
Aline keyway in brakehead (4) and brakeshoe (3) and insert brakeshoe retaining key (2).
Apply air brakes and check brake piston travel. Adjust brake piston travel for a measurement of 3 inches (76.2
mm) by turning slack adjuster head (1).