1 . When driving a trailer with ABS, you should:

Not depress the brakes as much as you would when driving a vehicle without ABS.
Use extra braking force to ensure the ABS kicks in.
Brake as you would when driving a vehicle without ABS.
Try to not brakes as often as you would when driving a vehicle without ABS.
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2 . What is another name for the service line?

The control line
The utility line
The open line
The parallel line
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3 . An air supply control in its "emergency" position will:

Turn on the air supply.
Apply the trailer emergency brakes.
Prevent a skid.
Accelerate the vehicle.
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4 . The trailer hand valve should not be used while you are driving because:

It will disconnect from the vehicle.
You will stop the vehicle too quickly.
It can cause a skid.
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5 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:

Air pressure drops to a level between 20 and 45 psi.
You are experiencing a trailer jackknife.
Wheels have regained traction after a skid.
Air pressure is above 45 psi.
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6 . In a combination rig, it is best to make:

Quick, sudden stops.
Sharp turns.
Quick accelerations.
Slow, planned stops.
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7 . When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.

The Anti-Lock Braking System
The emergency braking system
The trailer service brakes
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8 . In a double or triple combination, the ____ trailer should be directly behind the cab.

Lightest
Heaviest
Smallest
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9 . What is the Johnson bar?

A hand valve that works the trailer brakes
A valve that indicates the fuel level
A valve that limits the amount of cargo
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10 . When should the trailer hand valve be used?

Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid
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11 . To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:

Pump the air brakes to activate the ABS.
Look into the back of the fifth wheel.
Check for wheel speed sensors coming from the back of the brakes.
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12 . If color-coded, which color is used to identify service lines?

White
Yellow
Blue
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13 . Push in the trailer air supply control to:

Activate the emergency brakes.
Deactivate the air brakes.
Sound the horn.
Supply the trailer with air.
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14 . A trailer that is too high:

May not couple correctly.
Will couple securely.
Is not an issue.
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15 . When coupling a trailer:

Make sure to couple matching glad hands.
Any glad hand can be connected to any other glad hand.
It is best to leave one glad hand unattached.
Only one set of glad hands should be connected.
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16 . If the trailer begins to skid, it is best to:

Release the brakes.
Accelerate.
Quickly turn the steering wheel one way, then the other.
Brake.
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17 . One way to prevent a rollover is to:

Move cargo to the left side of the rig.
Keep cargo centered on the rig.
Move cargo to the right side of the rig.
Keep cargo as far from the ground as possible.
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18 . Look for matching colors when coupling glad hands. Service lines are often:

Green.
Orange.
Red.
Blue.
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19 . If your trailer begins to drift off course while you are backing, you should:

Continue trying to back up without stopping.
Turn the top of your steering wheel in the direction of the drift.
Turn the top of the steering wheel in the direction opposite of the drift.
Return the steering wheel to the 12 o’clock position.
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20 . The trailer hand valve:

Should always be used for parking.
Should only be used for parking on a downhill.
Should never be used for parking.
Should only be used when transporting cargo.
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