Quote:
Originally Posted by Mother_Trucker
Can anyone give me the steps for doing an air brake test for a Class A?
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I'm still in school here in MN although I live across the border in WI. I'm going to be taking my test on July 5.
The following are steps they gave us for the Air Loss Test. Hope this helps.
1.) Start the engine to fully charge the air tanks
2.) Place transmission in a low gear, shut down the engine, turn ignition key back to the on position.
3.) Push the tractor parking brake and the trailer air supply buttons in to release brakes and then allow the system to stabilize (watch for needles in the air guage(s) to stop moving).
4.) Apply service brakes and check for one minute to make sure there is no more than 4 psi loss.
5.) Pump service brake (foot pedal) until low pressure warning signal comes on (around 60 psi). You can turn the key off after the warning signal comes on.
6.) Continue to pump the brake until trailer air supply and the tractor parking brake buttons pop out (between 40-20 psi).
7.) Depress clutch, start engine, and check the parking brakes by trying to pull ahead.
8.) Place transmission in neutral, build up air in the system to 120-130 psi.
9.) Push in the tractor parking brake and the trailer air supply buttons, pull down on the trailer brake handle and place the transmission in a low gear and check to see that the 5th wheel is properly connected by trying to pull forward.
10.) With all brakes released, pull forward a few feet, step on clutch, and apply the service brakes to check to see that they are working properly.