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Texas
Texas CDL Air Brakes 1
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Q.1
Submit
What kind of force must emergency brakes use?
Air pressure
Mechanical
Heavy
Electrical
Q.2
Submit
Which of the following is not a part of an air brake system?
A service brake system
A parking brake system
An emergency brake system
An axle brake system
Q.3
Submit
If the low pressure warning light comes on while you are driving:
Braking will only occur if there is enough air in the tanks.
You can brake 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should continue driving, but turn the emergency flashers on to warn other motorists.
Q.4
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.5
Submit
Emergency brakes:
Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.
Q.6
Submit
Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
GPS.
A rear back-up camera.
Q.7
Submit
Most heavy-duty vehicles use:
Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.
Q.8
Submit
If the spring brakes are on, you should:
Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
Be especially careful because the brakes may fail.
Q.9
Submit
If your tractor is equipped with ABS but your trailer is not, the ABS:
Will not be effective.
Will still improve your steering control.
Will make jackknifing easier.
Will allow others to see when you brake.
Q.10
Submit
The ____ tells a driver how much pressure is in the air tanks.
Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake
Q.11
Submit
During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.
One half
One quarter
One third
One tenth
Q.12
Submit
Which type of brakes do most heavy-duty vehicles have?
Air brakes
Solid brakes
Liquid brakes
Gravity brakes
Q.13
Submit
To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.
Q.14
Submit
To stop in a vehicle that uses air brakes, the driver should:
Pull the air brake lever.
Engage the brake lever.
Push the brake pedal down.
Pull the brake pedal up.
Q.15
Submit
Pressing and releasing a brake pedal unnecessarily can:
Release air faster than it can be replaced.
Add more air to the braking system.
Make the brake pedal more sensitive.
Create a loud noise.
Q.16
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.17
Submit
During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:
3 psi in one minute.
6 psi in one minute.
8 psi in one minute.
4 psi in one minute.
Q.18
Submit
Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:
An extra set of brakes.
Voice-activated brakes.
Cruise control.
Anti-Lock Braking Systems (ABS).
Q.19
Submit
If using air tanks with manually operated drains, how often should you drain the tanks?
Every day
Once a week
Once a month
Once every 3,000 miles
Q.20
Submit
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 55 psi.
When tank pressure falls below 10 psi.
When tank pressure falls below 5 psi.
Q.21
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.22
Submit
The most common type of foundation brake used is the:
S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.
Q.23
Submit
What happens if the air pressure in a system's air tanks falls below 60 psi?
A warning light will come on.
The vehicle will not shift out of gear.
The front lights will flash.
The vehicle should stop.
Q.24
Submit
Most heavy-duty vehicles use ____ air brake systems.
Single
Dual
Triple
Quad
Q.25
Submit
Spring brakes come on:
When too much air pressure is lost.
When a control on the dashboard is activated.
When the tires have minimal tread depth.
When the brakes are noisy.
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