TEST OPTIONS
KNOWN INFO
Visual Inspection
REASON FOR QUESTION
Is air present at
air brake protecting valve
supply port FV2?
If air is present, air brake
protecting valve is faulty.
NO
YES
TM 9-2320-366-20-2
2-1976.20
Change 1
Go to step 19
of this fault.
j4. NO AIR PRESSURE PRESENT AT REAR GLADHAND(S)
(ALL MODELS EXCEPT M1088) (CONT)
13.
Vehicle park and service brakes
OK.
Air hoses free from kinks.
Emergency gladhand OK.
Air hose 155, 157, or 167
OK.
Service gladhand OK.
Air hose 149, 150, or 151
OK.
Air hose 102 OK.
Air hose 108 OK.
TRAILER AIR SUPPLY valve
OK.
Air hose 104 OK.
Air hose 241, 253, or 254
OK.
Air hose 230 or 256 OK.
Load sensing valve control port
tee fitting OK.
Air hose 240 or 243 OK.
Booster valve OK.
Service gladhand two-way
check valve OK.
Air hose 145 OK.
POSSIBLE PROBLEMS
Faulty air brake protecting
valve.
Faulty air hose 120.
Faulty inversion valve control
port 90-degree fitting.
Faulty air hose 128, 130, or
132.
Replace air brake
protecting valve
(para 11-18).