TM 9-2320-365-20-2
2-1634
YES
NO
Visual inspection
KNOWN INFO
TEST OPTIONS
REASON FOR QUESTION
Is air present at relay
valve control port air
hose?
A lack of air at relay valve
control port air hose will
prevent air delivery to
service brake chambers
and cause rear brakes
not to apply.
8.
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.
POSSIBLE PROBLEMS
Faulty air hose to control
port of relay valve.
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 hoses
(para 11-19).
i2. REAR BRAKES DO NOT APPLY (CONT)