TM 9-2330-356-14
(6) Remove fittings from valve ports.
Repair. No repair is authorized for the parking
d.
brake control valve. If malfunction or leakage is indicated,
replace the complete valve.
Installation.
e.
(1) Install fittings on valve ports. Use antiseize
tape (item 28, Appendix E) on male pipe threads. Remove
button and nut from control valve so that valve can be
inserted into mounting bracket.
(2) Position control valve in mounting bracket.
Install nut on neck of control valve and tighten securely.
(3) Install button on end of valve stem. Aline
hole in button with hole in stem and install roll pin.
(4) Connect air lines to fittings on valve ports and
remove tags.
(5) Remove blocking from semitrailer wheels.
Air Lines, Valves, and Fittings (Figs. 4-82
and 4-83)
a.
General. The general arrangement of the air
brake system on the semitrailers is shown in figures 4-82
and 4-83. Nylon tubing connects the gladhands on front of
semitrailer to the brake relay valve on rear air reservoir.
Clips fasten the tubing to the underside of the tank and to
the frame members. Grommets are installed to protect
the tubing where it passes through the frame and cross
members. Hoses and tubing connect the brake chambers
to the reservoirs and relay valve.
Maintenance. Visually inspect for damage to air
b.
lines, loose clips, or missing grommets. Also check the
following:
Removal.
c.
(1) Brake hoses should be looped in a way that
(1) Block semitrailer wheels to prevent move-
prevents the hoses from hanging below the axle.
ment.
(2) Separators on brake hoses should be
(2) Exhaust air from system by opening drain
positioned to prevent brake hoses from rubbing against
valves on bottom of air reservoirs.
axles or other brake hoses.
(3) Tag and disconnect airlines from elbows and
(3) Clips should be bent down securely on tubing.
adapter on control valve.
Replacement of Nylon Tubing.
c.
(4) With a small drift and hammer, remove roll
pin which secures button to stem of control valve. Remove
(1) Block semitrailer wheels to prevent move-
button.
ment.
(2) Exhaust air from system by opening drain
(5) Remove nut on neck of valve and pull the
valves on bottom of air reservoirs.
control valve from the mounting bracket.
