CDL Section 5; Air Brakes Written Exam.
Why must air tanks be drained? - CORRECT ANSWER Water and compressor oil can get inside of the tank and can freeze in cold weather and cause brake failure.
What is a supply pressure gauge used for? - CORRECT ANSWER It tells you how much pressure is in...
Why must air tanks be drained? - CORRECT ANSWER Water and compressor oil can get inside of the tank
and can freeze in cold weather and cause brake failure.
What is a supply pressure gauge used for? - CORRECT ANSWER It tells you how much pressure is in the
air tanks
All vehicles with air brakes must have a low air pressure warning signal - CORRECT ANSWER True
What are spring brakes? - CORRECT ANSWER When the air pressure is removed the springs put on the
brakes. A parking brake control in the cab allows the driver to let the air out of the brakes.
When the air pressure is removed the springs put on the brakes. A parking brake control in the cab
allows the driver to let the air out of the brakes. - CORRECT ANSWER True
What is a dual air brake system? - CORRECT ANSWER A dual air brake system has two separate air
systems which use a single set of brake controls. One system operates the regular brakes on the rear
axle or axles. The other system operates the regular brakes of the front axle (and possibly one rear axle).
Both systems supply air to the trailer (if there is one). The first system is called the primary system. The
second is called the secondary system.
What are the slack adjusters? - CORRECT ANSWER Slack adjusters control the braking power. Too much
brake slack can be very hard to stop.
How can you check slack adjusters? - CORRECT ANSWER Turn off the parking brakes so you can move
the slack adjusters. Use gloves and pull hard on each slack adjuster so that you can get to it. If a slack
adjuster moves more than about one inch where the push rod attaches to it, it probably needs
adjustment.
How can you test the low pressure warning signal? - CORRECT ANSWER Shut the engine off when you
have enough air pressure so that the low pressure warning signal is not on. Turn the electrical power on
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