TM 9-2320-260-20
8-15. BLEEDING SERVICE BRAKE SYSTEM (Contd)
25. Close valve (1) and remove hose (2) from bleeder adapter (3).
NOTE
Follow equipment manufacturer's instructions for storing
bleeder tank.
26. Remove bleeder adapter (3) from master cylinder (4).
27. Check that master cylinder (4) is at proper fluid level.
28. Install filler plug (12) on master cylinder (4). Tighten filler plug (12) 15-20 lb-ft (20-27 Nm).
29. Close master cylinder access panel (9) and install on crossmember (13) with new screw-assembled
lockwasher (8).
b. Manual Method
1.
Remove screw-assembled lockwasher (8) and open master cylinder access panel (9). Discard screw-
assembled lockwasher (8).
2.
Clean surface of master cylinder filler plug ( 12) with clean rags.
3.
Remove filler plug (12) and check that master cylinder (4) is at proper fluid level.
NOTE
Procedures for manually bleeding master air-hydraulic and wheel
cylinders are the same. The following steps are for the master
cylinder only.
4.
Clean bleeder screw (5) on master cylinder (4).
5.
Place hose (7) on bleeder screw (5) and place opposite end in clear container (6) half full of brake
fluid. Ensure hose (7) is below fluid level in container (6).
NOTE
Assistant will help with steps 6 through 8.
Direct assistant to slowly pump brake pedal (10) three times, then hold brake pedal (10) to cab
6.
floor (11).
7.
Open bleeder screw (5) and allow brake fluid to flow until no air bubbles are observed in
container (6).
8.
Close bleeder screw (5). Direct assistant to release brake pedal (10).
9.
Repeat steps 6 through 8 until no air bubbles are observed in container (6).
10.
Tighten bleeder screw (5) 10-20 lb-ft (14-27 Nm).
11.
Remove hose (7) and properly dispose of brake fluid from container (6).
12.
Repeat step 3 to ensure master cylinder (4) is at proper fluid level. Fill if necessary.
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