TM 1-1740-221-13&P&P
FIELD MAINTENANCE
BRAKE VALVE
INITIAL SETUP:
References
Test Equipment
Multimeter (WP 0157, Item 14)
Tools and Special Tools
General Mechanic Tool Box (WP 0157, Item 24)
Materials/Parts
Equipment Condition
Cloth, Lint-Free (WP 0156, Item 34)
Engine Shut Down
Plugs, Protective (WP 0156, Item 7)
Personnel Required
91B, Light Wheel Vehicle Mechanic (2)
INSPECTION
Visually inspect for brake valve for mount security, luid leaks at the valve, ittings, and brake lines/hoses and
for any damage affecting serviceability.
END OF TASK
TEST
Ohms test brake fails switch BFS (FO-1) for no continuity (Open). Brake fail switch BFS is a normally open switch
therefore no continuity should exist. Replace BFS if continuity is measured.
END OF TASK
REMOVAL
WARNING
Before servicing brake system components, make sure that the machine is on level ground.
Set the hand brake.
The use of Personal Protective Equipment (PPE) is required when using or handling hazardous
materials associated with operating and maintaining equipment (jet fuel, hydraulic luid, brake
luid, ethylene glycol, cleaning solvents, compressed air, and engine/axle oil). Failure to use
PPE when handling these materials could result in injury or death.
1.
Disconnect battery negative cables (WP 0111).
2.
Lift front of vehicle (WP 0029).
3.
Place a drip pan under the brake valve.
4.
Disconnect 2 brake hoses (Figure 1, Item 5 and 8) and plug.
5.
Disconnect 2 brake lines (Figure 1, Item 7 and 10) and plug.
6.
Remove brake valve mount nuts and bolts (Figure 1, Item 6 and 12) (nuts not shown).
7.
Allow brake valve to drop (Figure 1, Item 11).
8.
Remove brake switch screws (Figure 1, Item 1) and washers (not shown).
9.
Remove switch wires (Figure 1, Item 13 and 14).
10.
Remove brake valve ittings (Figure 1, Item 3 and 5) as assemblies noting orientation.
11.
Remove brake valve (Figure 1, Item 11).
12.
Remove brake valve switch (Figure 1, Item 2).
00821