TM 9-4940-549-14&P
b.
Remove filler plug from top of master cylinder. Fill cylinder with
brake fluid. Replace filler plug.
c.
While brake pedal on towing vehicle is being pumped slowly up and
down, open bleeder screw by turning three-quarters of a turn count-
Liquid will be forced through the line to expel air
erclockwise.
which will show as bubbles in fluid coming out of tube.
Repeat operation approximately ten times or until air bubbles do not
d.
appear. Watch flow, keeping tube submerged in fluid. When air
bubbles cease and stream is clear, close bleeder valve firmly. Re-
move bleeder.
Repeat operations in steps (1) thru (4) on each of the other wheels.
e.
f.
When all four wheel cylinders have been bled, fill master cylinder
.
with brake fluid and replace filler plug.
NOTE
When bleeding brakes, keep master cy-
linder as full as practical to prevent
pumping air into the fluid lines.
19-12.
BRAKE SHOES.
a.
Removal.
(1) Remove the hub and brake drum (para. 19-15).
(2) Remove the two C-washers (23, figure 19-8) and remove strap
(8).
(3) Remove the brake release springs (14) and remove the brake
shoes (11).
b.
Cleaning, Inspection, and Repair.
(1) Use an approved cleaning solvent to clean all metal parts and
brake linings.
(2) Inspect the brake linings for excessive wear. If linings are
worn within one-sixteenth to one-thirty-second inch from the
head of the brake lining rivets, the brake shoes should be re-
placed.
(3) Inspect brake linings for traces of oil or grease. If oil or
grease saturation is evident, replace the brake shoes.
(4) Replace all defective brake components.
c.
Installation.
(1) Install in reverse order of a above.
