Take Texas CDL Air Brakes Test 2

QUESTION 1 / 25

The air pressure in a dual air brake system should build from 85 to 100 psi within:

Choose one answer below.

ATwo minutes.✓B15 seconds.✓C10 minutes.✓D45 seconds.✓

QUESTION 2 / 25

Failing to drain the tanks in an air brake system can result in:

Choose one answer below.

AWater freezing and causing brake failure.✓BSquishy brakes.✓CToo much air collecting.✓DToo much fuel being carried.✓

QUESTION 3 / 25

If the brake pads rub against the brake drums and create too much heat:

Choose one answer below.

AThe brakes will stick.✓BThe brakes will become extra sensitive.✓CThe brakes may stop working.✓DThe air compressor will kick on to cool the brakes.✓

QUESTION 4 / 25

Vehicles with dual air brake systems:

Choose one answer below.

AMaintain full-capacity air pressure in the braking systems even when the vehicle is not running.✓BMaintain some air pressure in the braking systems when the vehicle is not running.✓CMust be run to build enough air pressure to brakes to operate properly.✓DDo not need time to build air pressure before a trip.✓

QUESTION 5 / 25

A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.

Choose one answer below.

AGreen✓BYellow✓COrange✓DWhite✓

QUESTION 6 / 25

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

Choose one answer below.

A3 psi✓B5 psi✓C7 psi✓D9 psi✓

QUESTION 7 / 25

The brake pedal is part of which braking system?

Choose one answer below.

AThe service brake system✓BThe parking brake system✓CThe emergency brake system✓DThe auxiliary brake system✓

QUESTION 8 / 25

Most heavy-duty vehicles use ____ air brake systems.

Choose one answer below.

ASingle✓BDual✓CTriple✓DQuad✓

QUESTION 9 / 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 10 / 25

Where is the safety relief valve usually located?

Choose one answer below.

ANear the rear brake✓BNear the front brake✓CIn an air tank✓DOn the dashboard✓

QUESTION 11 / 25

The application pressure gauge:

Choose one answer below.

AShows how much air pressure is being applied to the brakes.✓BShows the temperature of air being used in the braking system.✓CShows the pressure of the air coming from the compressor.✓DShows the number of times the brakes have been used.✓

QUESTION 12 / 25

In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

Choose one answer below.

AYou will be unable to move the vehicle.✓BA separate air tank can be used to release the spring brakes for a short period of time.✓CYou can use the spring brakes to continue driving normally.✓DThe air tanks will automatically refill to a safe air pressure level.✓

QUESTION 13 / 25

If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. The belt should be:

Choose one answer below.

ALoosely attached.✓BTight.✓CCracked.✓DFrayed.✓

QUESTION 14 / 25

How is water and compressor oil removed from the bottom of an air storage tank?

Choose one answer below.

AThe water and oil are siphoned out of the tank.✓BA drain valve is opened to remove the water and oil from the tank.✓CThe water and oil are removed automatically as the brakes are used.✓DA sponge is used to soak up the water and oil.✓

QUESTION 15 / 25

When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.

Choose one answer below.

AAt least three inches✓BMore than two inches✓CUp to five inches✓DNo more than one inch✓

QUESTION 16 / 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 17 / 25

What color are ABS malfunction lamps?

Choose one answer below.

AOrange✓BYellow✓CGreen✓DBlue✓

QUESTION 18 / 25

Applying the brake pedal causes air pressure to activate an electric switch and:

Choose one answer below.

ATurn off the brake lights.✓BTurn on the low pressure warning light.✓CTurn on the brake lights.✓DTurn off the low pressure warning light.✓

QUESTION 19 / 25

Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.

Choose one answer below.

A10 psi✓B25 psi✓C50 psi✓D100 psi✓

QUESTION 20 / 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 21 / 25

While driving, spring brakes are generally held in place by:

Choose one answer below.

AAir pressure.✓BChocks.✓CFoundation brakes.✓DSturdy ties.✓

QUESTION 22 / 25

When the brake pedal is pushed down, air brakes work:

Choose one answer below.

AImmediately.✓BAfter a short delay.✓CAfter about a minute.✓DOnly if it is warm outside.✓

QUESTION 23 / 25

During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:

Choose one answer below.

A10 psi in a minute.✓B8 psi in a minute.✓C6 psi in a minute.✓D4 psi in a minute.✓

QUESTION 24 / 25

The air storage tanks:

Choose one answer below.

AHold only enough air for one braking cycle.✓BHold enough air for brakes to be used several times if the compressor stops working.✓CDo not hold air unless there is an emergency.✓DHold enough air for more than 1,000 braking cycles.✓

QUESTION 25 / 25

When using the controlled braking method in an emergency situation, you should:

Choose one answer below.

AApply the brakes as hard as possible without locking the wheels.✓BApply the brakes with about half of your usual force.✓CApply the brakes so the wheels lock.✓DApply the brakes with minimal pressure.✓