![]() The maximum air pressure available for brake applications depends on how much air is in the reservoir. They must store a sufficient volume of air to allow several brake applications if the engine stops or the compressor fails. Reservoirs are pressure-rated tanks, which hold a supply of compressed air until required for braking or operating auxiliary air systems. The governor must take the compressor out of its pumping stage (unload/cut-out) when system air pressure reaches 120 to 145 psi (828 to 1,000 kPa), and also put it back into the pumping stage at a minimum of 100 psi (690 kPa). In the unloaded stage (with two cylinder compressors), the compressor pumps air back and forth between the two cylinders without supplying the reservoirs. In the loaded stage, air is pumped into reservoirs. The compressor’s intake system draws air from either its own air filter or from the engine’s intake system.Ĭompressors that have their own filtration system must be serviced on a regular basis.Īll compressors run continuously while the engine is running, but air compression is controlled and limited by a governor which loads or unloads the compressor. Self-lubricated compressors must have their oil checked and changed at regular intervals. Although most compressors use the truck’s lubrication and cooling systems, some are self-lubricated and some are air cooled. 8) is to build up and maintain air pressure required to operate air brakes and air-powered accessories.Īir compressors are either gear driven directly from the engine or belt driven. Brake shoes and drums or brake rotors and pads: to create the friction needed to stop the vehicle. ![]() Brake chambers: to transfer the force of compressed air to mechanical linkages.Foot valve: to draw compressed air from reservoirs when it is needed for braking.Reservoirs: to store the compressed air.Compressor: to build up and maintain air pressure.The five main components of an elementary air brake system and their purposes are:
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