Tighten nut until it is snug
Slide connector nut off tubing on connector.
a g a i n s t r e a r o f f r o n t c r o s s m e m b e r . T i g h t e n nut at front of crossmember
until coupling is secure.
( 5 ) T h e open side of each air hose coupling should be in a vertical position
f a c i n g t h e c e n t e r o f t h e t r a i l e r . C o v e r opening with dummy coupling unless
connection to air supply is to be made immediately.
AIR LINES AND FITTINGS
G e n e r a l mechanics t o o l
Air lines and fittings
Air lines and air line fittings are not ordinarily removed except for
Bent, kinked or damaged lines and fittings must be replaced.
S e e brake system schematic.
must be kept tightly attached and connected.
PARKING BRAKE CONTROL VALVE
General mechanics tool kit
Parking brake control valve
(1) Tag and disconnect air line (1, figure 4-28) between parking brake control
valve (2) and air charging system control valve (3).
(2) Tag and disconnect air lines (4 and 5) on parking brake control valve (2).
(3) On the outside of the semitrailer, pull boot (1, figure 4-29) away from
Remove roll pin (2).
frame rail until roll pin (2) is visible.
(4) Remove control valve handle (3) and boot (1).
(5) Remove locknut (4).