Take Massachusetts CDL Air Brakes Test 1

QUESTION 1 / 23

If one air system in a dual air brake system is very low on pressure:

Choose one answer below.

ANone of the brakes will work at all.✓BEither the front or rear brakes will not be operating fully.✓CThere will be no noticeable affect.✓DLights on the outside of the tractor will flash.✓

QUESTION 2 / 23

When only the tractor is equipped with an Anti-Lock Braking System (ABS):

Choose one answer below.

AThere is a decreased risk of jackknifing.✓BThere is an increased risk of jackknifing.✓CThe brakes will not work as effectively as they would without ABS.✓DThe brakes will become more sensitive.✓

QUESTION 3 / 23

Air pressure should build up in a single air system within:

Choose one answer below.

A15 minutes.✓B12 minutes.✓CThree minutes.✓DOne minute.✓

QUESTION 4 / 23

If the air pressure warning light comes on, you should:

Choose one answer below.

AContinue driving normally.✓BActivate your hazard lights and continue driving.✓CCall the local law enforcement agency.✓DSafely exit the roadway and stop.✓

QUESTION 5 / 23

You should not use the parking brake:

Choose one answer below.

AIf your vehicle is stopped on a level surface.✓BIf your vehicle is stopped on a slight incline.✓CIf your vehicle's brakes are very hot.✓DIf your vehicle's other braking systems seem to be working adequately.✓

QUESTION 6 / 23

What must be on an air tank in an air-braked vehicle?

Choose one answer below.

AA check valve✓BA lock✓CA trap door✓DAn oxidizer✓

QUESTION 7 / 23

Most heavy-duty vehicles use:

Choose one answer below.

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

QUESTION 8 / 23

What color is the low air pressure warning light?

Choose one answer below.

AGreen✓BOrange✓CRed✓DPurple✓

QUESTION 9 / 23

An Anti-Lock Braking System (ABS):

Choose one answer below.

ACannot be used with air brakes.✓BShould be used on dry pavement.✓CCan assist in maintaining control when braking.✓DShould only be used if all axles have ABS.✓

QUESTION 10 / 23

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 11 / 23

In a newer vehicle, you apply the parking brake:

Choose one answer below.

ABy using a diamond-shaped yellow knob.✓BBy using a round red knob.✓CBy using a square green knob.✓DBy using a black round knob.✓

QUESTION 12 / 23

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 six months✓

QUESTION 13 / 23

When starting a vehicle with dual air brakes, pressure of ____ should be built up in the system before it is driven.

Choose one answer below.

A10 psi✓B25 psi✓C100 psi✓D200 psi✓

QUESTION 14 / 23

Do not use the parking brake when parking if:

Choose one answer below.

AThe brakes are very hot.✓BThe brakes are very cold.✓CThere is snow on the ground.✓DThere is water on the ground.✓

QUESTION 15 / 23

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

Choose one answer below.

ABraking will only be possible if there is still enough air in the tanks.✓BYou can apply the brakes 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 stay at least 100 feet away from other vehicles.✓

QUESTION 16 / 23

When operating a vehicle with a dual brake system, a driver should:

Choose one answer below.

ALet the vehicle warm up before driving to ensure that fuel reaches the engine.✓BWait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.✓CBegin driving just after the vehicle starts.✓DPump the pedal about 20 times to build pressure, then begin driving.✓

QUESTION 17 / 23

The safety valve located on the first tank opens:

Choose one answer below.

ARegularly.✓BIf there is too little pressure.✓CIf there is too much pressure.✓DAfter every stop.✓

QUESTION 18 / 23

Air brakes are:

Choose one answer below.

AAn effective tool for stopping large vehicles.✓BProhibited on large vehicles.✓COnly effective in poor weather.✓DA tool to improve fuel efficiency.✓

QUESTION 19 / 23

Vehicles with dual air brake systems:

Choose one answer below.

AHave air pressure in the braking system even when the vehicle is not running.✓BMaintain some air pressure in the braking system when the vehicle is not running.✓CMust be run to build air pressure to allow the brakes to operate properly.✓DMaintain air pressure when shut off for periods of less than four hours.✓

QUESTION 20 / 23

The parking brake should be:

Choose one answer below.

AUsed whenever you park the vehicle.✓BUsed while driving.✓CSet when driving in bad weather.✓DUsed to stop the vehicle in normal driving.✓

QUESTION 21 / 23

When traveling down a steep downgrade:

Choose one answer below.

AThe air brakes should be used.✓BShift into a lower gear, then use brakes to supplement the braking effect of the engine.✓CThe vehicle should be continually downshifted in the place of using the brakes.✓DThe vehicle should be driven on the shoulder.✓

QUESTION 22 / 23

Air tank drains:

Choose one answer below.

AAllow rain water to enter the tank.✓BAre used to drain water and compressor oil from the air tank.✓CShould never be opened.✓DMust remain open during transit.✓

QUESTION 23 / 23

Emergency brakes:

Choose one answer below.

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