TM 9-2320-361-20 8-12. SERVICE BRAKE BLEEDING (Contd) b. Manual Method 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 8-34 Perform task a, steps 1 through 4. 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. Clean area around bleeder screw (8) on air-hydraulic cylinder (11). 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 5 through 11. 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). 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). Close bleeder screw (8) or (14) and inform assistant to release brake pedal (12). Refill master cylinder (6) with brake fluid. Repeat steps 5 through 7 until no air bubbles appear when brake pedal (12) is applied. Remove hose (9) from bleeder screw (8) and tighten bleeder screw (8) 10-20 lb-ft (14-27 NŽm). NOTE If wheel cylinders are to be bled, go to step 10. If not, go to step 14. 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. Clean around bleeder screw (14) on wheel cylinder (13). 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. Repeat steps 5,6,7, and 8. When finished bleeding wheel cylinder (13), remove hose (15) and tighten bleeder screw (14) 10-15 lb-ft (14-20 NŽm). Do not reuse brake fluid. Reusing brake fluid may result in damage to equipment. Dispose of brake fluid in approved disposal area. Ensure master cylinder (6) is filled with fresh brake fluid to 0.5 in. (1.27 cm) from top. Install filler plug (5) on master cylinder (6) and tighten to 15-20 lb-ft (21-28 NŽm). Connect line (3) to adapter (4). Close access door (1) on brace (2) and install with screw-assembled lockwasher (7).