1.Read: Resource on the principles/procedure in bleeding air tank considering: Nissan Diesel Engine Repair Manual, pp. 6-14 DatePerforming Underchassis Preventive MaintenancePage no.
1.1proper use of personal protective equipment (PPE) 1.2hazards in bleeding air tank.2Complete: Checking/inspecting moisture and leakage.3Call your teacher to check your work. Change from vapor to liquid.LEARNING EXPERIENCES / ACTIVITIESLearning Outcome #6: Inspect/bleed air tankLearning Activity #2ResourcesThis is the final activity for LO#5. In thisactivity, you are going to:1.Perform the procedure in bleeding an air tank considering:1.1proper use of personal protective equipment (PPE)1.2hazards associated in performing the task.1.3drained accumulated water.2Check air tank's pipes, hoses and clips.3Call your teacher to check your work.Nissan Diesel Engine Repair Manual, pp. 6-6 to 6-14INFORMATION SHEET No. 1 (LO6-1)Inspecting/Bleeding Air TankDESCRIPTION AND OPERATIONGENERAL AIR BRAKE SYSTEMSThe air brake system consists of three sub-systems; the air supply system, the air delivery system, and the parking/emergency air brake system. The components making up the brake system of each vehicle may differ, but all systems operate in basically the same manner.DatePerforming Underchassis Preventive MaintenancePage no.
All models use a vertically split brake system. If a failure occurs in the front brake system, the rear brake system will continue to operate and give reduced stopping capability until the air supply is depleted.In the event of a failure in the rear system, the relay valve modulates application of therear spring brake units and the front brakes continue to function.AIR SUPPLY SYSTEMThe air supply system is the source of air pressure for the brake system. It consists of a compressor, reservoirs, governor, low pressure indicator, depth gauge, safety valve, drain cock/automatic moisture ejector valve and tank charging valve.The compressor is engine driven and controlled by a governor. When reservoir air pressure reaches 793-861 kPa (115-125 psi), the governor cuts out the compressor. When reservoir pressure drops to 82-179 kPa (12-26 psi) below the cut-out pressure, the governor allows the compressor to cut in again. When reservoir air pressure drops below 353 kPa (60 psi), the low pressure indicator valve closes an electrical circuit to the warning buzzer and the warning light. If the air reservoir pressure exceeds 1034 kPa (150 psi), the safety valve will release the pressure.The air reservoirs are equipped with manual drain valves and/or an automatic moisture ejector valve which can be drained for the removal of moisture from the air brake system.AIR DELIVERY SYSTEMThe air delivery system delivers the air brake pressure from the air supply system to the brake chambers. It controls the amount of air pressure that is delivered to the brake chambers, and thus controls the amount of braking during a stop. It consists ofthe foot control valve, the relay valve, quick release valve, and the brake chamber.