TM 9-2320-365-20-2
2-1636
YES
NO
Is air present at supply
port of relay valve?
Visual inspection
KNOWN INFO
TEST OPTIONS
REASON FOR QUESTION
A blocked or leaking
supply air hose from
primary tank to supply port
of relay valve will prevent
air delivery to service
brake chambers and
cause rear brakes not to
apply.
9.
Front brakes OK.
Air tanks pressurized.
Supply air hose to foot
control valve OK.
Foot control valve OK.
Air hoses at cab floor OK.
Air hose to check valve OK.
Check valve OK.
Air hose to load sensing
valve OK.
Load sensing valve OK.
Air hose to control port of
relay valve OK.
POSSIBLE PROBLEMS
Faulty air hose to supply
port of relay valve.
Faulty relay valve.
Faulty air hoses to spring
brakes.
Faulty vent hose from
spring brake service
chamber.
Faulty spring brake
chamber.
Replace damaged air hose
(para 11-19).
i2. REAR BRAKES DO NOT APPLY (CONT)
