The Air Brake system should be checked before every trip. Normal pressure is 120-125 psi.
AIR BRAKE SYSTEM CHECKS
AIR GOVERNOR TEST
Start engine and build air up the air pressure until compressor governor cuts out. This will be evident when the pressure gage needles stop rising. Depress the service brake treadle slowly and then release. Observe that for each depression Of the brake treadle that the service air pressure decreases by observing the gage. Continue depressing and releasing the brake treadle until the governor cuts in and the air pressure begins to increase. When this occurs, the air pressure in the tank as read on the gage should not be less than 85 psi. Let the air pressure build up until the governor cuts out as indicated by a steady air pressure. The air pressure in the tank should not exceed 130 psi.
STATIC BRAKE TEST The static brake test will verify that the vehicle air system that is normally charged as you travel is not leaking. If your coach is equipped with an automatic transmission ensure the coach is placed on a level location, or block a wheel to keep from rolling. Place the gear shift selector in neutral and turn the engine off. Observe the air pressure gage reading and release the parking brake. Do not touch the service brake treadle or any other component connected with the air system. The air pressure in the tanks should not decrease by more than 2 psi in one minute.
APPLIED BRAKE TEST The applied brake test will verify that the vehicle air system that is normally charged as the service brakes are applied is not leaking. Depress the service brake treadle and keep it fully depressed for the duration of this test. After the air pressure has stabilized, observe the pressure gage. The air loss should not exceed 3 psi in one (1) minute (tap gauge occasionally). Any movement of the service brake treadle will consume air pressure, causing the failure of this test.
LOW AIR WARNING DEVICE The low air warning device test will verify that the low air pressure alarm goes off as designed Turn the ignition on (key switch) but do not start the engine. Observe the air pressure gauge and pump the service brake treadle until you can see the low air pressure warning light come on and/or hear the warning buzzer. The low air pressure warning should come on at about 60 psi.
EMERGENCY BRAKE SYSTEM TEST The Emergency brake system test will verify that the vehicle emergency brake system functions as designed. Turn off the ignition and then reduce the air pressure by depressing and releasing the service brake treadle until the emergency (parking) brake handle pops up. By observing the pressure gage this should occur when the tank pressure falls below 45 psi.
Start the engine and immediately place the transmission in gear and try to move coach slowly against the emergency brake with low air pressure. At this pressure the emergency brakes should be applied by the large springs in the rear brake chambers. As soon as the engine is started the air pressure will start to build up but it will not be routed to the emergency brake chamber because the handle has popped out. Caution should be used so as not to apply too much pressure against the brakes and drive train.
EMERGENCY BRAKE TEST The emergency brake test will verify that the vehicle emergency brakes can be applied, as the vehicle is moving. When applying the emergency brakes on a moving coach, the vehicle speed should not exceed 5 to 7 mph. Allow the air pressure to build up until it cuts out. Put the coach in gear, release the parking brake and allow the coach to move forward slowly. Apply the emergency (parking) brake by pulling up on the button. Do not operate the service brake treadle. The vehicle should come to a complete and sudden stop.
CHECK SERVICE BRAKES (verify that the service brakes are adjusted so they do not cause a pull in either Direction.) Set coach in motion and apply the service brake firmly to see if the steering wheel pulls to the left or right.You should do the Air Brake systems test before every trip
U.S. Coast Guard retired- 1956-1985
2016 Siesta 24ST
1972 Moto Guzzi Eldorado