4-61. BRAKES - REPLACE/REPAIR.
This Task Covers:
Tool Kit, General Mechanic's: Automotive (Appendix B, Section III, Item 1).
Tool Kit, Common Number 1 (Appendix B, Item 2)
Rags, wiping (Appendix E, Section II, Item 1).
Brake Fluid (Appendix E, Section II, Item 2).
GAA Grease (Appendix E, Section II, Item 15)
Unit shut down and cool.
Unit parked on dry, level ground.
Trailer connected to towing vehicle.
Hub and drum removed (para. 4-60)
Removal. (Refer to Figure 4-61.)
Remove two shoe return springs (1) and retainer plate (2) from back plate (3).
Remove retainer spring (4) and brake adjustment screw (5) from back plate (3)..
Turn 1/2 turn and remove spring and cup (6), and pins (7) from back plate (3) and remove brake shoes (8).
Loosen brake line (9) and bleed emerging fluid into a clean jar or container.
Remove two bolts (10) from back of brake wheel cylinder (11) and remove brake wheel cylinder (11).
Disconnect brake line (9) at rear of brake wheel cylinder (11).
Remove five nuts (12), five washers (13), and back plate (3) off of spindle (14). Remove rubber plug (15).
Inspect back plate (3) for cracks, wear, or damage Replace if faulty.
Inspect brake wheel cylinder (11) for damage or leakage. Replace if damaged.
Measure brake lining thickness on brake shoes (8); if less than 1/8", replace brake shoes (8).
Replace brake adjustment screw (5) if worn, corroded, or bent Replace if there is wear on knurled wheel.
Inspect shoe return springs (1), and retainer springs (4), for cracks or distortion. Replace if faulty.