1 . The parking brake in a newer vehicle is applied by:

Moving a lever to the right.
Pushing a yellow, diamond-shaped knob.
Pulling a yellow, diamond-shaped knob.
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2 . When starting the engine of a truck with a trailer, you can tell that your vehicle's ABS is not working if:

The yellow light on the left rear of the trailer stays on.
The red light on the right side of the trailer flashes three times.
All the rear lights flash and then turn off.
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3 . If a trailer's spring brakes do not release when you push the tractor air supply control, you should:

Check the air line connections.
Release the pintle hook.
Replace the spring brakes.
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4 . During a trip, the ____ should be open.

Rear service line shut-off valve
Rear supply line shut-off valve
Inner shut-off valves
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5 . A shut-off valve is:

A device that prevents air from escaping an air brake system.
A substitute for a pintle hook.
Another name for a glad hand.
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6 . If a tire fails, you should:

Use the brakes.
Stay off the brakes.
Swerve.
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7 . When parking, you should not use the parking brake if:

The brakes are very hot.
The brakes are very cold.
There is snow on the ground.
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8 . Braking mechanisms are located inside:

The fifth wheel.
A brake drum.
The landing gear.
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9 . Low underneath clearance can cause difficulties when driving:

Over railroad crossings.
On gravel roads.
Around corners.
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10 . Trailers built before 1975 are:

Required to have spring brakes.
Not required to have spring brakes.
Unsafe to drive.
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11 . ABS brakes:

Help you avoid wheel lockup.
Lock up your vehicle's wheels.
Prevent your vehicle from accelerating when going uphill.
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12 . During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:

10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.
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13 . During a walk-around inspection, ensure the release arm is properly seated and the safety latch or lock is:

Engaged.
Deactivated.
Polished.
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14 . When uncoupling a dolly, you should:

Unlock the pintle hook before moving the dolly out from under the rear trailer.
Move the dolly out from under the rear trailer before unlocking the pintle hook.
Raise the dolly landing gear.
Remove the dolly as quickly as possible.
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15 . ____ make up the emergency brake system.

Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems
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