Air Brake Test
Air Brakes Test you absolutely cannot skip a beat. Everything has to be perfect, from what you say to what you physically touch. Something as small as failing to announce a successful air brake test can get you an automatic fail. This is the NUMBER 1 cause of a pre-trip failure!!!
There are three stages to an Air Brake Test
- Applied Pressure Test
- Warning Light and Buzzer
- Tractor/Trailer Protection Valve Pop Out
Applied Pressure Test-
- Build the air pressure to governor cut out. Put the truck in the lowest gear. Then turn off the engine Immediately turn the engine back on. Push in both the tractor and trailer valves. (This will release the parking brakes.) Push and hold the Brake pedal fully. Allow the gauges to stabilize. Announce the gauges have stabilized and the Primary and Secondary PSI. With the Brakes fully pressed, you should not lose more than 4 PSI in one minute. Announce that you are listening for air leaks during that minute.
- This test was successful because I did not lose more than 4 PSI in this tractor trailer combination vehicle.
Warning Light and Buzzer Test-
- Pump down on the Brake pedal until the warning light and buzzer comes on, at or before 60 PSI.
- This test was successful because my warning light and buzzer both came on at or before 60 PSI.
Tractor/Trailer Protection Valve Pop Out Test-
- Pump down on the brake pedal until both the tractor and trailer protection valves pop out. They should both pop out between 40 and 20 PSI.
- This test was successful because my tractor and trailer valves popped out between 40 and 20 PSI.