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 TM 9-2330-394-13&P
BRAKE SYSTEM THEORY OF OPERATION
GENERAL
The trailer is equipped with an air brake system which complies with the Federal Motor Vehicle Safety
Standard (FMVSS) 121, S5.5. The trailer brake system operates in tandem with the towing vehicle brake
system. The trailer brake system is made up of a number of components including EMERGENCY and
SERVICE gladhand hoses, an air tank, an Anti-lock Braking System (ABS) Electronic Control Unit (ECU),
ABS external diagnostic capability, and several valves which control the application and release of the
brakes.
EMERGENCY AND SERVICE GLADHAND HOSES
The EMERGENCY and SERVICE gladhand hoses provide air for operation of the trailer brakes from the
towing vehicle. One hose is for SERVICE brake operation; the other hose is for EMERGENCY brake
operation. Both hoses have gladhand couplings.
0005 00-1
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