TX CDL AIR BRAKES PRACTICE TEST
16.
To use the controlled braking method in an emergency, you should:
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apply your brakes all the way, and release the brakes when the wheels lock up.
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apply the brakes as hard as you can without locking the wheels.
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pump the brake pedal 3 times.
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apply the brakes when the wheels lock up.
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17.
The stop light switch:
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warns you when the air supply pressure drops below 55 psi.
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turns on the brake lights when you put on the air brakes.
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should be used to fend off tailgaters.
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tells you when you need to use your parking brake instead of the service brake.
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18.
The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
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it applies a "Shock" to the brakes.
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"S" stands for "Shoes".
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it is a safe-driving brake.
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it is shaped like the letter "S".
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19.
The __________ keeps air from going out if the air compressor develops a leak.
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tractor protection valve
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air compressor drive belt
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emergency relay valve
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one-way check valve
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20.
When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Going to the rear of the rig.
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Using the trailer handbrake to provide air to the service line.
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