InspectionQuestion 39 of 60
Why should you drain the air tanks and check for oil or water before a trip if the tanks do not have automatic drains?
a.To remove moisture and oil that could damage the brakes or freeze
b.To increase the air pressure
c.To speed up the compressor
d.To test the parking brake knob
Explanation
Air tanks collect water and compressor oil, so tanks without automatic drains must be drained manually. Removing this buildup prevents freezing in cold weather and protects brake components. A lot of oil in the tanks can indicate a compressor problem.
Practice all 60 questions free — no signup required.
Related questions on this topic
- What should you check about the brake drums or discs during a walk-around inspection?
- During inspection, brake linings (shoes or pads) should be checked for what?
- When inspecting the air lines and hoses, what should you look for?
- 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?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against CDL Air Brakes Knowledge Test · How we review