TM 1-1740-221-13&P&P
FIELD MAINTENANCE
HYDRAULIC MASTER CYLINDER (BRAKES)
INITIAL SETUP:
Tools and Special Tools
Cloth, Lint-Free (WP 0156, Item 34)
Floor Creeper (WP 0157, Item 7)
Personnel Required
Floor Jack 5 Ton (WP 0157, Item 11)
91B, Light Wheel Vehicle Mechanic (2)
General Mechanic Tool Box (WP 0157, Item 24)
Jack Stands 5 Ton (WP 0157, Item 12)
References
Drip Pan, 1 qt (WP 0155, Item 26)
Wheel Chocks (WP 0155, Item 25)
Materials/Parts
Equipment Condition
Brake Fluid, Hydraulic (WP 0156, Item 18)
Engine Shut Down
Caps and Pugs (WP 0156, Item 7)
INSPECTION
Inspect master cylinder and brake pedal linkage for security. Inspect hose connections and master cylinder piston
for leakage. Tighten hose connection if required. Replace master cylinder and pedal linkage as necessary.
END OF TASK
REMOVAL
WARNING
Before servicing brake system components, make sure that the machine is on level ground. Set
the parking brake. Put chocks on each side of all four wheels. Disconnect the battery so that the
engine cannot be started. If you do not take these precautions, the machine could run you over.
1.
Release engine cover rubber tie-downs and open engine cover (WP 0028).
2.
Remove both front seats by pressing release lever and sliding seat forward (WP 0096).
3.
Remove seat cover to have access to brake master cylinder (WP 0028). Use loor creeper to have access
to brake valve located under the front of vehicle.
4.
Disconnect battery cables (WP 0111).
WARNING
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.
WARNING
Hydraulic luid is combustible. Do not use or store near lames, sparks, or hot surfaces.
Use only in a well-ventilated area. If hydraulic luid is decomposed by heat, toxic gases are
released. Prolonged contact with liquid or mist can cause dermatitis and severe skin irritation.
If there is any prolonged contact with skin, wash contacted area with soap and water. Remove
contaminated clothing and launder before reuse. If liquid contacts eyes, lush eyes with water
immediately. If luid is swallowed, do not try to vomit; luid may enter the lungs and cause
severe injury. Get immediate medical attention. When handling liquid, wear rubber gloves
and impervious clothing to minimize contact. If prolonged contact with mist is likely, wear
NIOSH/MSHA approved respirator.
00801