Can anyone give me the steps for doing an air brake test for a Class A? I have had my Class B for 11 yrs but am a little confused about how they want me to do the pretrip air brake to upgrade. I know how to do the test for Class B, is it the same thing but using pushing both knobs in? I failed the pretrip the first time because I didn't pull up and hit the brakes to see if it pulled to one side or the other, which is now an auto fail on the pretrip inspection. Everyone I know around here was grandfathered in and seriously not sure how the test is. Thanx!
Straight Truck Air Brake Pretrip Inspection:
1. Start engine and build pressure to 90-110 lbs
2. To test parking brake with engine running:
A. Apply Parking Brakes
B. Put in gear, then slowly release clutch
C. Vehicle must stay stopped where it is
3. Shut engine down, turn key back on.
4. Charge air system (Push one knob in)
5. Wait for initial fill.
6. Wait one minute for air leakage, rate should be no more then 2 psi.
7. Apply 90 lbs pressure to brakes and hold for one minute.
Air leakage should be no more then 3 psi.
8. Pump Brakes till red light/buzzer comes on ( about 60 lbs)
9. Keep pumping brakes till one knob pops out. (about 20-40 psi) Brakes will set.[/url]