TM9-2330-358-14&P
g. Main Wiring Harness Installation.
CAUTION
Be sure all grommets are present when installing wiring
harness. If grommets are missing, the wiring harness
may be damaged when threading through frame.
(1) Install main wiring harness (see electrical schematic, fig. 4-19).
(2) Connect coupling between rear wiring harness and main wiring harness.
Install nose box cover assembly.
(3) Connect wires to terminal board.
TASK ENDS HERE
Section VII.
Page
Air Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Reservoir ......................................................................
Brake Shoes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description of Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dummy Couplings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Relay Valve (M871) . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . ...
Emergency Relay Valve (M871A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gladhands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multi-Function Valve (M871) . .. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multi-Function Valve (M871A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slack Adjuster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spring Brake Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Uncaging Spring Brake Chambers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-29.
DESCRIPTION OF BRAKES
a. General. When the brake system of the semitrailer is properly connected to
the service brake system of the towing vehicle, the service brake pedal on the
towing vehicle controls the brakes on both vehicles. All units needed to produce
and maintain a constant supply of compressed air are located on the towing vehicle
and must operate effectively to ensure proper performance of the semitrailer brakes.
--. Type of Brakes. The brakes are the air actuated type (figs. 4-20, 4-21).
b
Air pressure is used to operate the mechanical internal brakes at the semitrailer
wheels. The brakes are applied in proportion to the foot pressure applied to the
brake pedal of the towing vehicle.
c. Brake System Units. The brake system consists of internal brakes, slack
adjusters, service air line, emergency air line, emergency relay valve, multi-
function valve, air reservoirs, spring brake chambers and connections.
4-46