InspectionQuestion 43 of 60
What is the correct order for the brake system portion of a pre-trip inspection regarding air build-up?
a.Build pressure to cutout, then test build-up rate, warning signal, spring brake activation, and leak rates
b.Test the parking brake first, then drain all tanks
c.Drive the vehicle, then check the compressor
d.Apply the hand valve, then check the tires
Explanation
You first let the system build to governor cutout to confirm the compressor and governor work. Then you check the build-up rate, test the low-pressure warning, continue fanning to confirm the spring brakes apply, and finally check the leak rates. Doing the checks in order confirms each safety feature works.
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Related questions on this topic
- Why should you drain the air tanks and check for oil or water before a trip if the tanks do not have automatic drains?
- During the pre-trip air brake check, when should you check that the pushrod stroke is not too long?
- What does it mean if the low-pressure warning stays on after you start building air pressure?
- Before the leak-down (static) tests, to what pressure should the air system be brought?
- If you find a lot of oil in the drained air from the tanks, what could this indicate?
- Why is it important to check that the governor cuts the compressor in and out at the correct pressures?
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