TM 9-2320-365-101-19. BRAKE SYSTEMFigure 1-14. Brake SystemThe vehicle is equipped with a brake system which complies with the Federal MotorVehicle Safety Standard (FMVSS) 121. The brake system is made up of an aircompressor, air dryer, primary and secondary air tanks, and several valves which controlthe application and release of the brakes.(1) The air compressor (1, Figure 1-14) supplies approximately 120 psi (827 kPa) to theair dryer (2).(2) The air dryer contains a heating element and a desiccant cartridge to removemoisture from the air before it is delivered to the primary air tank (3) and secondary airtank (4).(3) The foot control valve (5) receives pressurized air from both the primary andsecondary air tanks. The foot control valve is a two circuit design, with one set of portsdirecting air to the front brakes from the secondary air tank and a second set of portsdirecting air to the rear brakes from the primary air tank. The plumbing between theprimary and secondary air tanks is designed to allow controlled braking in the event ofa failure in either the primary (rear brakes) or secondary (front brakes) brake circuit.When air pressure in the wet tank (6) falls below a preset limit, pres-surized air, normallyused for the CTIS, is redirected to the primary brake circuit.1-45
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