Take Pennsylvania CDL Air Brakes Test 2

QUESTION 1 / 25

Front wheel braking works:

Choose one answer below.

AOnly on packed snow.✓BUnder all conditions.✓COnly if the road is dry.✓DUnder most conditions.✓

QUESTION 2 / 25

During a static leakage test, the maximum leakage rate for a double combination vehicle 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 3 / 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 4 / 25

All air tanks must include:

Choose one answer below.

AA drain valve.✓BA lock.✓CA trap door.✓DA warning sticker.✓

QUESTION 5 / 25

If the low pressure warning signal activates while you are driving, you should:

Choose one answer below.

AContinue driving normally.✓BExit the road and park as soon as safely possible.✓CStop where you are and park.✓DPut on your hazard lights and continue driving.✓

QUESTION 6 / 25

The service brake system:

Choose one answer below.

AApplies and releases the brakes when you press the brake pedal while driving normally.✓BApplies and releases the parking brakes.✓CApplies and releases the emergency brake.✓DApplies and releases the axle brake.✓

QUESTION 7 / 25

Both systems in a dual air brake systems share:

Choose one answer below.

AAir tanks.✓BHoses.✓CAir lines.✓DAn air compressor.✓

QUESTION 8 / 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 9 / 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 10 / 25

When a brake pedal is pressed and the S-cam is turned, the S-cam:

Choose one answer below.

APresses the brake shoes against the inside of the brake drum.✓BTightens the brake drum onto the axle.✓CPresses the brake lining against the wheel.✓DReleases air from the air tanks.✓

QUESTION 11 / 25

How many air storage tanks are used in an air brake system?

Choose one answer below.

ATwo tanks✓BFour tanks✓CSix tanks✓DThe number varies.✓

QUESTION 12 / 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 13 / 25

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 14 / 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 15 / 25

What does the air compressor governor do?

Choose one answer below.

AControls when the air compressor pumps air into the air storage tanks.✓BControls how quickly air leaves the air storage tanks.✓CControls the temperature of the air entering the air storage tanks.✓DControls the temperature of the air leaving the air storage tanks.✓

QUESTION 16 / 25

What color is the low air pressure warning light?

Choose one answer below.

AGreen✓BOrange✓CRed✓DPurple✓

QUESTION 17 / 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 18 / 25

When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Choose one answer below.

ASlack adjuster.✓BAxle.✓CBrake drum.✓DAlcohol evaporator.✓

QUESTION 19 / 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 20 / 25

The parking brake should be:

Choose one answer below.

AUsed whenever you park your vehicle.✓BUsed while driving.✓CSet when driving in bad weather.✓DRemoved.✓

QUESTION 21 / 25

Why do you need to drain air tanks regularly?

Choose one answer below.

ABecause the air gets old and needs to be replaced✓BBecause compressed air contains some water which must be drained from the tanks✓CTo allow for a change in air pressure✓DTo remove bad air from the tanks✓

QUESTION 22 / 25

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 23 / 25

What kind of force must emergency brakes use?

Choose one answer below.

AAir pressure✓BMechanical✓CHeavy✓DElectrical✓

QUESTION 24 / 25

How is the parking brake released?

Choose one answer below.

ABy tapping the brake pedal three times✓BBy pushing in the brake control knob✓CBy starting the vehicle✓DBy tapping the accelerator twice✓

QUESTION 25 / 25

Air tank drains:

Choose one answer below.

AAllow rain water to enter the tanks.✓BAre used to drain water and oil from the tanks.✓CShould never be opened.✓DMust remain open while driving.✓