Take Texas CDL Air Brakes Test 1

QUESTION 1 / 25

What kind of force must emergency brakes use?

Choose one answer below.

AAir pressure✓BMechanical✓CHeavy✓DElectrical✓

QUESTION 2 / 25

Which of the following is not a part of an air brake system?

Choose one answer below.

AA service brake system✓BA parking brake system✓CAn emergency brake system✓DAn axle brake system✓

QUESTION 3 / 25

If the low pressure warning light comes on while you are driving:

Choose one answer below.

ABraking will only occur if there is enough air in the tanks.✓BYou can brake 14 times before the air in the system runs out.✓CYou should continue to drive normally and check the brake system when it is convenient.✓DYou should continue driving, but turn the emergency flashers on to warn other motorists.✓

QUESTION 4 / 25

When you need to stop in an emergency, you should:

Choose one answer below.

ALock the wheels and skid to a stop.✓BStop in a way that keeps your vehicle in a straight line.✓CStop in a way that turns your vehicle.✓DExpect your vehicle to slow down more quickly than usual.✓

QUESTION 5 / 25

Emergency brakes:

Choose one answer below.

AAre not required on trucks.✓BAre only required on trailers.✓CAre required on tractors.✓DAre optional.✓

QUESTION 6 / 25

Truck tractors with air brakes built on or after March 1, 1997 must have:

Choose one answer below.

AAn Anti-Lock Braking System (ABS).✓BBluetooth.✓CGPS.✓DA rear back-up camera.✓

QUESTION 7 / 25

Most heavy-duty vehicles use:

Choose one answer below.

ASingle air brake systems.✓BDual air brake systems.✓CTriple air brake systems.✓DQuadruple air brake systems.✓

QUESTION 8 / 25

If the spring brakes are on, you should:

Choose one answer below.

ANot use the brake pedal.✓BPress the accelerator.✓CMove the steering wheel.✓DBe especially careful because the brakes may fail.✓

QUESTION 9 / 25

If your tractor is equipped with ABS but your trailer is not, the ABS:

Choose one answer below.

AWill not be effective.✓BWill still improve your steering control.✓CWill make jackknifing easier.✓DWill allow others to see when you brake.✓

QUESTION 10 / 25

The ____ tells a driver how much pressure is in the air tanks.

Choose one answer below.

AApplication pressure gauge✓BAir compressor governor✓CSupply pressure gauge✓DDrum brake✓

QUESTION 11 / 25

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.

Choose one answer below.

AOne half✓BOne quarter✓COne third✓DOne tenth✓

QUESTION 12 / 25

Which type of brakes do most heavy-duty vehicles have?

Choose one answer below.

AAir brakes✓BSolid brakes✓CLiquid brakes✓DGravity brakes✓

QUESTION 13 / 25

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Choose one answer below.

ASet the control to normal.✓BSet the control to the off position.✓CSet the control to neutral.✓DKeep the control at the halfway mark.✓

QUESTION 14 / 25

To stop in a vehicle that uses air brakes, the driver should:

Choose one answer below.

APull the air brake lever.✓BEngage the brake lever.✓CPush the brake pedal down.✓DPull the brake pedal up.✓

QUESTION 15 / 25

Pressing and releasing a brake pedal unnecessarily can:

Choose one answer below.

ARelease air faster than it can be replaced.✓BAdd more air to the braking system.✓CMake the brake pedal more sensitive.✓DCreate a loud noise.✓

QUESTION 16 / 25

During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.

Choose one answer below.

A1 psi✓B2 psi✓C3 psi✓D4 psi✓

QUESTION 17 / 25

During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:

Choose one answer below.

A3 psi in one minute.✓B6 psi in one minute.✓C8 psi in one minute.✓D4 psi in one minute.✓

QUESTION 18 / 25

Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:

Choose one answer below.

AAn extra set of brakes.✓BVoice-activated brakes.✓CCruise control.✓DAnti-Lock Braking Systems (ABS).✓

QUESTION 19 / 25

If using air tanks with manually operated drains, how often should you drain the tanks?

Choose one answer below.

AEvery day✓BOnce a week✓COnce a month✓DOnce every 3,000 miles✓

QUESTION 20 / 25

A low air pressure warning signal should activate:

Choose one answer below.

AWhen tank pressure falls below 120 psi.✓BWhen tank pressure falls below 55 psi.✓CWhen tank pressure falls below 10 psi.✓DWhen tank pressure falls below 5 psi.✓

QUESTION 21 / 25

What do anti-lock brakes do?

Choose one answer below.

AHelp a driver avoid wheel lockup✓BLock up the front wheels✓CPrevent a vehicle from accelerating while traveling uphill✓DPrevent a vehicle from accelerating while traveling downhill✓

QUESTION 22 / 25

The most common type of foundation brake used is the:

Choose one answer below.

AS-cam drum brake.✓BC-cam drum brake.✓CG-cam disc brake.✓DP-cam disc brake.✓

QUESTION 23 / 25

What happens if the air pressure in a system's air tanks falls below 60 psi?

Choose one answer below.

AA warning light will come on.✓BThe vehicle will not shift out of gear.✓CThe front lights will flash.✓DThe vehicle should stop.✓

QUESTION 24 / 25

Most heavy-duty vehicles use ____ air brake systems.

Choose one answer below.

ASingle✓BDual✓CTriple✓DQuad✓

QUESTION 25 / 25

Spring brakes come on:

Choose one answer below.

AWhen too much air pressure is lost.✓BWhen a control on the dashboard is activated.✓CWhen the tires have minimal tread depth.✓DWhen the brakes are noisy.✓