4-44. BRAKE INTERLOCK VALVES AND FITTINGS MAINTENANCE.
THIS TASK COVERS
Removal of Inversion Valve
Installation of Inversion Valve
Removal of Brake Interlock Valve and
Removal of Relay Quick Release Valve
Installation of Relay Quick Release Valve
installation of Brake Interlock Valve and
Removal of Shuttle Valve
Installation of Shuttle Valve
Tool kit, general mechanic's
General Safety Instructions:
Wear safety goggles and face shield when
performing leakage tests on brake inter-
Personnel Required: Two
Ensure that air lines do not rub against
each other or any other surface when in-
TM 9-2320-273-10 or
a. OPERATING TEST
If disconnected, connect tractor EMERGENCY and SERVICE air couplings to semitrailer (see
paragraph 2-12). Fully pressurize semitrailer air system (see
Push in on paddle (12) of brake interlock valve (4) at front port (13). Listen for sound of air
exhausting through exhaust port on underside relay quick release valve (1).
Repeat step 2 to check operation of brake interlock valve (4) at rear inlet (10).
b. LEAKAGE TEST
Wear safety goggles and face shield when performing leakage tests on
brake interlock valves. Failure to follow this warning may result in serious
eye injury due to high pressure air.
With semitrailer still coupled to tractor and with air system fully pressurized, apply a soap
solution to all brake interlock lines, fittings, and valves. There should be no leakage.
Push in on paddle (12) of brake interlock valve (4) at front port (13). Observe exhaust port on
underside of relay quick release valve (1). Air should exhaust for a period of approximately
two seconds. After two seconds, there should be no leakage.
Repeat step 2 to check for leakage while operating brake interlock valve (4) at rear inlet (10).