TM 9-2330-373-14 & P
BLEEDING HYDRAULIC BRAKE SYSTEM (ceont) I
MANUAL BLEEDING (cont)
Do not pump master cylinder dry. Damage may result to the braking system.
Expelled air will show as bubbles coming out of tube. Continue step 5 above until air bubbles cease.
Remove bleeder tube.
Repeat steps 1 through 5 on remaining wheel cylinders, replenishing fluid in master cylinder reservoir as
Close towing vehicle shutoff valves, open air reservoir drain cock and disconnect towing vehicle SERVICE and
EMERGENCY air line couplings from semitrailer couplings.
Install filler plug and vent tube in top of master cylinder reservoir.
Close air reservoir drain cock.
PRESSURE FEED FILLER BLEEDING
Remove filler plug (2) and vent tube assembly
(3), install pressure feed adapter in master cylinder filler
hole, and connect pressure feed filler hose to pressure
Master cylinder reservoir should contain
from 10 to 20 psi (68.95 to 137.90 kpa)
air pressure and sufficient fluid to
maintain a constant level in master
Bleed system as in manual bleeding (steps 2, 4,
6 and 9 above), except that replenishing of brake fluid
and manual operation of vehicle brake pedal are not
Remove pressure feed filler hose and
pressure feed adapter from master
cylinder (1) and install filler plug
Vent tube assembly
(2) and vent tube assembly (3).