BRAKE SYSTEM

TM 9-2320-391-10

M1078A1 SERIES THEORY OF OPERATION -

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BRAKE SYSTEM (Vehicle S/N 11,438 to 18,549) - Continued

The air compressor supplies approximately 120 psi (827 kPa) to the air dryer.

The air dryer contains a heating element and a desiccant cartridge to remove

moisture from the air before it is delivered to the primary air tank and secondary air

tank.

The foot control valve receives pressurized air from both the primary and secondary

air tanks. The foot control valve is a two circuit design, with one set of ports directing

air to the front brakes from the secondary air tank and a second set of ports

directing air to the rear brakes from the primary air tank. The plumbing between the

primary and secondary air tanks is designed to allow controlled braking in the event

of a failure in the primary (rear brakes) or secondary (front brakes) brake circuit.

When brake air pressure falls below a preset limit, pressurized air from the wet

tank, normally used for the CTIS and fan solenoid, is redirected to the primary brake

circuit.

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