TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0172 00 0172 00-4 SERVICE BRAKE BLEEDING (Contd) WARNING Accidental or intentional introduction of liquid contaminants into the environment is a violation of state, federal, and military regulations. Refer to Army POL (WP 0001 00) for information concerning storage, use, and disposal of these liquids. Failure to do so may result in damage to environment and health of personnel. CAUTION Do not reuse brake fluid. Reusing brake fluid may result in damage to equipment. NOTE Use a drain pan to capture any draining brake fluid. Dispose of fluids in accordance with local policy and ordinances. Ensure all spills are cleaned up. MANUAL METHOD 1. Remove screw-assembled lockwasher (7) from brace (2) and open access door (1) exposing top of master cylinder (6). Discard screw-assembled lockwasher (7). 2. Disconnect vent line (3) from adapter (4). 3. Clean top of master cylinder (6) and remove filler plug (5). 4. Fill master cylinder (6) with fresh brake fluid to 1/2 in. (1.27 cm) from top. 5. Install filler plug (5). CAUTION Always bleed air-hydraulic cylinder before bleeding downstream hydraulic components. Failure to do so may result in damage to equipment. 6. Clean area around bleeder screw (8) on air-hydraulic cylinder (11). 7. Connect a snug fitting flexible hose (9) on bleeder screw (8) and immerse other end of hose (9) in a transparent container (10) 1/3 to 1/2 filled with brake fluid. Keep end of hose (9) always under surface of brake fluid. NOTE Assistant is required for steps 8 through 14. 8. Have assistant slowly apply and release brake pedal (12) twice, then slowly apply and hold down brake pedal (12). Have assistant tell you when holding down brake pedal (12). 9. While assistant holds brake pedal (12) down, open bleeder screw (8) 3/4 turn on air-hydraulic cylinder (11) or bleeder screw (14) on wheel cylinder (13). Observe for air bubbles in container (10) or (16). 10. Close bleeder screw (8) or (14) and inform assistant to release brake pedal (12). Refill master cylinder (6) with brake fluid. 11. Repeat steps 8 through 10 until no air bubbles appear when brake pedal (12) is applied. 12. Remove hose (9) from bleeder screw (8) and tighten bleeder screw (8) 10–20 lb-ft (14–27 N•m). NOTE • If wheel cylinders are to be bled, go to step 13. If not, go to step 17. • If more than one wheel cylinder is to be bled, start with wheel cylinder farthest from master cylinder and progress in sequence to wheel cylinders closest to master cylinder. 13. Clean around bleeder screw (14) on wheel cylinder (13). 14. Connect a snug fitting flexible hose (15) to bleeder screw (14) and immerse end of hose (15) in a transparent container (16) 1/3 to 1/2 filled with brake fluid. Keep end of hose (15) always under surface of brake fluid.