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Pennsylvania
Pennsylvania CDL Air Brakes 1
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Q.1
Submit
Both systems in a dual air brake systems share:
Air tanks.
Hoses.
Air lines.
An air compressor.
Q.2
Submit
When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.
At least three inches
More than two inches
Up to five inches
No more than one inch
Q.3
Submit
What kind of force must emergency brakes use?
Air pressure
Mechanical
Heavy
Electrical
Q.4
Submit
During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.
1 psi
2 psi
3 psi
4 psi
Q.5
Submit
Applying the brake pedal causes air pressure to activate an electric switch and:
Turn off the brake lights.
Turn on the low pressure warning light.
Turn on the brake lights.
Turn off the low pressure warning light.
Q.6
Submit
Foundation brakes are used:
Only at the front wheels.
Only at the rear wheels.
Only at the driver’s side wheels.
At each wheel.
Q.7
Submit
Brakes may get out of adjustment:
If they are too hot.
In colder weather.
If they are used.
If they get wet.
Q.8
Submit
In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.
Q.9
Submit
When traveling down a steep downgrade, the best way to use your brakes is to:
Ride the brakes all the way down the hill.
Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.
Apply the brakes only near the bottom of the downgrade.
Apply consistent pressure to the brake pedal all the way down the hill.
Q.10
Submit
Before starting down a hill, be sure to:
Accelerate.
Switch into a high gear.
Sound your horn.
Switch into a low gear.
Q.11
Submit
Service brakes should:
Be tested once a month.
Only be tested by a trained mechanic.
Be tested before every trip.
Q.12
Submit
When using the controlled braking method in an emergency situation, you should:
Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half of your usual force.
Apply the brakes so the wheels lock.
Apply the brakes with minimal pressure.
Q.13
Submit
During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.
Q.14
Submit
Most heavy-duty vehicles use ____ air brake systems.
Single
Dual
Triple
Quad
Q.15
Submit
To use the stab braking method in an emergency situation, you should:
Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.
Apply the brakes about halfway, but keep the wheels rolling.
Fully apply the brakes, let the wheels lock up, and hold the brake pedal down, keeping the wheels locked until the vehicle stops.
Apply the emergency brake.
Q.16
Submit
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
When tank pressure falls below 5 psi.
Q.17
Submit
In a dual air brake system, a leak in one system:
Always means there are leaks in both systems.
May not affect the other system.
Is not something to worry about.
Will also affect the other system.
Q.18
Submit
Vehicles with dual air brake systems:
Maintain full-capacity air pressure in the braking systems even when the vehicle is not running.
Maintain some air pressure in the braking systems when the vehicle is not running.
Must be run to build enough air pressure to brakes to operate properly.
Do not need time to build air pressure before a trip.
Q.19
Submit
What color is the low air pressure warning light?
Green
Orange
Red
Purple
Q.20
Submit
How should you test the low pressure warning signal?
Engage and disable the parking brake.
Rapidly press and release the brake pedal.
Open the rear shut-off valves.
Uncouple and recouple all glad hands.
Q.21
Submit
While driving downhill, you should brake until you reach a speed that is ____ below your safe speed, then release the brake pedal.
5 mph
10 mph
15 mph
20 mph
Q.22
Submit
A tank endorsement is:
Only required when transporting gases.
Only required when transporting liquids.
Used when transporting both liquids and gases.
Optional when transporting hazardous materials.
Q.23
Submit
What do anti-lock brakes do?
Help a driver avoid wheel lockup
Lock up the front wheels
Prevent a vehicle from accelerating while traveling uphill
Prevent a vehicle from accelerating while traveling downhill
Q.24
Submit
When you need to stop in an emergency, you should:
Lock the wheels and skid to a stop.
Stop in a way that keeps your vehicle in a straight line.
Stop in a way that turns your vehicle.
Expect your vehicle to slow down more quickly than usual.
Q.25
Submit
When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
Slack adjuster.
Axle.
Brake drum.
Alcohol evaporator.
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