Figure 75. Wheel removed to show service brakes.

TM 10-3930-222-20

c. Bleeding Brakes. Any air in the hydraulic brake

(2) Connect a bleeder tube on the bleed

screw on the wheel backing plate and

system will cause a springy, rubbery action of the brake

allow the tube to hang into a container

pedal or will cause the brake pedal to go all the way to

containing hydraulic fluid.

the floor plate under normal pressure. Whenever a line

has been disconnected at the master cylinder, the entire

(3) Depress the brake pedal and open the

system must be bled at both wheels until all air is

bleeder screw. While the brake pedal is

completely expelled.

When a line has been

completely depressed, close the bleeder

disconnected at either wheel cylinder, this cylinder

screw. Release the brake pedal.

together with the cylinder on the opposite wheel must be

(4) Repeat (2) above three or four times, or

bled. Bleed the brakes of air as follows:

until bubbles cease to appear in

(1) Fill the master cylinder with brake fluid.

Figure 75. Wheel removed to show service brakes.

119