Manual Bleeding. Manual bleeding

TM 10-3930-632-12

Figure 4-55. Brake System Bleed Points

WARNING

(g) When bleeding wheel cylinders

(bleed points D and E), attach a small hose to the

Always relieve pressure from bleeder tank

bleeder screw on the axle adapter, submerge the other

when bleeding operation is completed.

(2) Manual Bleeding. Manual bleeding

end of the hose into a jar of clean brake fluid. Hold the

jar at a point higher than the bleeder screw, and open

may be performed when pressure bleeding equipment is

the bleeder screw, allowing fluid to flow into the jar until

unavailable. Manual bleeding will require two men, one

no more bubbles can be seen in the flow.

to depress and hold the brake pedal while the other

(h) When air bubbles stop coming

opens and closes the bleeder valves. Proceed as

into the container, close the bleeder fitting and remove

outlined under pressure bleeding, but observe the

the tube. Close bleeder tank valve.

following special instructions:

(i) Disconnect bleeder tank line from

(a) It must be remembered that the

master cylinder and connect it to the inching master

brake pedal should be depressed slowly and held until

cylinder.

the line connections or bleeder screws are securely

(j) Follow the same procedure as

tightened. This prevents the possibility of air being

outlined above, but start at inching valve bleeding point.

drawn into the system during the bleeding operation.

(k)

When bleeding operation is

Check the master cylinder reservoir

completed, fill both cylinders to with 1/4 inch from the

top.

4-71