TM 5-4930-218-14
blow them clear with compressed air. Wash all fit-
hose (5) and fittings (6 through 10).
tings in solvent.
(3) Remove the four cap screws (14), nuts (15),
(2) Inspect hoses for cracks, abrasions,
and lock washers (16) that secure each of the air
deterioration, fraying, collapsed walls, and damaged
reservoirs to the front plate; remove the air reser-
threads on hose ends. Replace defective hoses.
voirs.
(3) Inspect all fittings for cracks, damaged
b. Cleaning and Inspection.
threads, corrosion, and other damage; replace
(1) Wipe the exterior of the air reservoirs with a
damaged fittings.
cloth dampened with dry cleaning solvent (fed. spec.
c. Installation.
P-D-680). Flush the interiors of the tanks with
(1) Install the air lines and fittings that in-
solvent. Continue to rinse until clear solvent runs
terconnect the brake system air components in the
out.
(2) Inspect the air reservoirs for cracks, dents,
reverse order of removal. Refer to figure 4-21.
broken mounting bracket weldments, and other
WARNING
damage. Replace a defective air reservoir.
Be sure that you install the SERVICE
WARNING
and EMERGENCY intervehicular air
The air reservoirs are subjected to
lines correctly. SERVICE connections
high air pressures that can rupture
terminate on t h e right side;
an improperly repaired or welded
EMERGENCY on the left. Check that
tank. You must replace the reservoir
they connect to the properly marked
if it is defective. No repairs are
ports on the relay valve (30). If hoses
authorized.
are improperly connected, the brake
c. Installation. Installation is the reverse of
system will fail.
removal. Refer to figure 4-21. After installation,
(2) Install the air lines and fittings that in-
build up pressure in the air system and check for
terconnect the towing unit with the lubricating and
leaks using a soap bubble solution.
servicing unit in the reverse order of removal. Refer
to figure 4-20.
(3) After reassembly, check out the air brake
a. Removal and Disassembly.
system to assure its proper operation by connecting it
(1) Disconnect the air lines (1 and 2, fig. 4-21) to
to a towing vehicle and applying pressure to the
the brake chambers.
system. Operate the brake controls on the towing
(2) Disconnect the hydraulic lines from the
vehicle. Check the system for leaks with a soap bub-
master cylinder (para 4-66a).
ble solution. Correct any leaks.
(3) Remove the four cap screws (21, fig. 4-21),
nuts (22), lock washers (23), and flat washers (24) that
secure the brake chamber and master cylinder assem-
a. Removal (fig. 4-21).
bly (25) to the front plate; remove the assembly.
(1) Open the drain cock (13) at the bottom of the
lower air reservoir (17) to release all air from the
(4) Remove the three nuts (1, fig. 4-22) and lock
brake system.
washers (2) and separate the master cylinder (3) and
(2) Disconnect air hoses (4 and 5) and remove
bracket (7) from the assembled air chamber.
