Class 1A Truck and Trailer Air Tests

Class 1A Air Tests

1. Chock wheels.
2. Drain air tanks.
3. Start engine, low air pressure alarm should go out minimum 60 psi.
4. Pressure should build from 85 to 100 psi in less than two minutes at max 800 rpm.
5. Governor should cut out compressor between 120 and 145 psi.
6. Push both valves in, governor should cut in compressor at minimum 100 psi.
7. Air up to max pressure, shut down engine.
   1. Break service line, should be no air loss.
   2. Break supply line, should be no air loss from trailer, trailer brakes should dynamite, and air loss from tractor should stop at a minimum of 20 psi.
   3. Check that slack adjusters on trailer are about 90 degrees to pushrods.
   4. After air loss stops, check that
      1. trailer supply valve popped, tractor park brake valve has not popped
      2. air pressure is above 20 psi
      3. no air loss on full brake application
      4. connect air lines
8. Start engine, supply trailer after alarm stops.
9. Air to max pressure, shut down engine, turn key on.
10. Make full brake application for one minute, should be no more than 4 psi loss.
11. Fan brakes, low air pressure alarm should come on at minimum 60 psi.
12. Fan brakes, trailer supply valve should pop out at minimum 20 psi, tractor park brake valve doesn't have to pop, but tractor park brakes must apply at minimum 20 psi.
13. Start engine, do immediate tug.
14. Pick up chocks.
15. Supply trailer.
16. At minimum 100 psi
    1. do another tug
    2. pop trailer valve, release tractor brakes, tug
    3. supply trailer and roll ahead, then pull spike to stop
    4. roll ahead, use brake pedal to stop.
17. Pop trailer valve, release tractor park brakes, ensure air pressure above 100 psi, shut down, pocket key, chock drive wheels, check drive axle slack adjusters.
18. Air tests complete! Finish paperwork and drive!