TM 9-2330-271-14&P
(5) Release snap and chain assembly (K) and
braking system on the chassis is controlled from the
allow brace (E) to engage bracket (G) while lowering leg
towing vehicle.
b. Connect the dummy couplings to the air brake
assembly.
(6) Install pin (C) into mount (S). Install pins
couplings to prevent dirt from entering the braking
(A and B).
system when the chassis is not connected to the towing
vehicle.
2-7. Air Brake Half Couplings (fig. 4-34).
a. Two air brake half couplings are mounted on
2-8. Air Reservoir Drain Cocl (fig. 2-5)
the front of the chassis. The coupling on the right side is
labelled SERVICE by a metal tag attached to the
a. The hand operated drain cock is located at end
coupling. The other coupling (on the left) is labelled
and bottom of air reservoir.
EMERGENCY. When the SERVICE air brake coupling
b. Turn counterclockwise to open drain cock to
on the towing vehicle is connected to SERVICE coupling
drain moisture and to permit release of air pressure if
on the chassis and the EMERGENCY air brake coupling
brakes lock. Turn clockwise to close drain cock.
is connected to EMERGENCY coupling, the service
c. Open drain cock daily after semitrailer
operation. Close before operation.
Figure 2-5. Air reservoir drain cock.
2-5
