ONTARIO AIR BRAKE PRACTICE TEST 04

Our practice tests cover all the material that will be on the actual exam, including air brake system theory, air brake system components, and air brake inspection and maintenance procedures. By using our practice tests, you can identify any areas of weakness that you may have, and focus your studying efforts on those topics to reinforce your understanding.

Ontario Air Brake Test 04

When checking a vehicle's brake drums, you should be looking out for...?

a. Discoloration

b. All of these things

c. Cracks

d. Moisture

Question 1 of 30

When applying a test to the spring brakes, the test is only passed if...?

a. The wheels do not turn the more than three quarters of a revolution

b. The wheels do not turn more than two revolutions

c. The vehicle does not travel forward more than 2 m

d. The vehicle only rocks slightly

Question 2 of 30

Brake lining can be contaminated by...?

a. Grease

b. Grease and Oil

c. Water

d. Oil

Question 3 of 30

You should make sure that air tanks are securely attached to the vehicle by...?

a. Looking at them

b. Pulling on them

c. Any of these

d. Tapping them

Question 4 of 30

The application of the automatic trailer spring brakes can be confirmed by...?

a. Accelerating the vehicle hard

b. Physically pushing the trailer

c. Gently applying engine power

d. Visual inspection

Question 5 of 30

A straight truck, tractor or bus must not lose air pressure with the brakes fully applied at a rate of more than...?

a.34 kPa (5 psi) per minute

b.21 kPa (3 psi) per minute

c.25 kPa (3.6 psi) per minute

d.37 kPa (5.3 psi) per minute

Question 6 of 30

The minimum pressure for compressor cut-in is...?

a.452 kPa (65 psi)

b.602 kPa (87 psi)

c.502 kPa (72 psi)

d.552 kPa (80 psi)

Question 7 of 30

The amount of moisture discharged from tanks other than the supply tank should be...?

a. The same as that from the supply tank

b. Less than that from the supply tank

c. More than that from the supply tank

d. Any of these

Question 8 of 30

A tractor hauling two or more trailers must not lose air pressure with the brakes fully applied at a rate of more than...?

a. 34 kPa per minute

b. 41 kPa per minute

c. 44 kPa per minute

d. 37 kPa per minute

Question 9 of 30

The low air pressure warning device is defective if it fails to activate at a minimum level of...?

a.480 kPa (69 psi)

b.280 kPa (40 psi)

c.180 kPa (26 psi)

d.380 kPa (55 psi)

Question 10 of 30

Air brake chamber leaks must be inspected for with...?

a. Service brakes released and spring brakes applied

b. Spring brakes released and service brakes applied

c. Both sets of brakes applied

d. Both sets of brakes released

Question 11 of 30

Actual cut-out pressure must never be higher than...?

a.1000 kPa (145 psi)

b.972 kPa (140 psi)

c.932 kPa (135 psi)

d.902 kPa (130 psi)

Question 12 of 30

When testing the spring brakes on a towing vehicle and trailer, it is preferable to perform the test on...?

a. Either vehicle

b. The towing vehicle

c. Both vehicles

d. The trailer

Question 13 of 30

An air pressure buildup time test should be made with the engine idling between...?

a.500 – 700 RPM

b.600 – 900 RPM

c.700 – 1000 RPM

d.400 – 600 RPM

Question 14 of 30

The maximum allowable air loss for a tractor and trailer when the brakes are applied is...?

a.26 kPa (3.7 psi) per minute

b. 28 kPa (4 psi) per minute

c.32 kPa (4.5 psi) per minute

d.34 kPa (6 psi) per minute

Question 15 of 30

You must never make an inspection of your brakes unless...?

a. Wheel chocks or blocks are in place

b. The spring brakes are applied

c. All of these apply

d. The vehicle is on level ground

Question 16 of 30

When the air pressure has been reduced to below 552 kPa, it should then be able to rise from 587 kPa to 690 kPa within...?

a. Four minutes

b. One minute

c. Two minutes

d. Three minutes

Question 17 of 30

The drive belt of an air compressor should give slightly under...?

a. Firm hand pressure

b. A heavy blow

c. Finger pressure

d. Light hand pressure

Question 18 of 30

The outer cover of an air line has been damaged, but there is no leak to the inner tube. What action should you take?

a. Have the line replaced

b. Make a note to monitor it

c. Wrap the damaged area with tape

d. None

Question 19 of 30

Spring brakes should be tested by applying the brakes and...?

a. Sharply applying engine power in a high gear

b. Gently applying engine power in a low gear

c. Sharply applying engine power in a low gear

d. Gently applying engine power in a high gear

Question 20 of 30

The recommended way to test a trailer's automatic spring brakes is to...?

a. Pump the brake pedal

b. Any of these

c. Disconnect the trailer air supply line

d. Pull out the trailer supply valve

Question 21 of 30

Air compressors should always be inspected with...?

a. The engine off

b. The engine running in first gear

c. The engine running in high gear

d. The engine idling in neutral

Question 22 of 30

The amount of air loss from a system should be measured with the brake fully applied for how long?

a. 30 seconds

b. Three minutes

c. Two minutes

d. One minute

Question 23 of 30

When checking air brake chambers, you should be looking out for...?

a. Non-manufactured holes

b. Mismatched slack adjuster lengths

c. Cracks

d. All of these things

Question 24 of 30

If a vehicle has a foundation brake defect, the Ontario Highway Traffic Act specifies that it may not...?

a. Be operated in urban areas

b. Be operated on any high speed road

c. Be operated on any road or highway

d. Be operated on the road except to be taken to be fixed

Question 25 of 30

Brake lining is the friction material that is fastened to...?

a. The tire

b. The wheel rim

c. The brake drum

d. The brake shoe

Question 26 of 30

A tractor protection valve should be tested by disconnecting the trailer service line and then...?

a. Shifting into first gear

b. Driving 100 yards

c. Applying the brake pedal

d. Starting the engine

Question 27 of 30

The discovery of a small quantity of oil is only no cause for concern if it comes from...?

a. The supply tank

b. The third tank

c. The final tank

d. The second tank

Question 28 of 30

You should begin a test of the low air pressure warning device with the pressure above...?

a.721 kPa (104 psi)

b.521 kPa (75 psi)

c.421 kPa (61 psi)

d.621 kPa (90 psi)

Question 29 of 30

If air brake chambers on different sides of an axle are different sizes, this may cause...?

a. Tire wear

b. Braking imbalances

c. Reduced braking force

d. Skidding

Question 30 of 30

Ontario Air Brake Test

Our free Ontario air brake test questions and answers will prepare you to pass Ontario’s official Air Brakes knowledge test. To begin your career in trucking, you must obtain your Ontario Class A or Class D Truck Driver’s Licence. The appropriate CDL endorsements you will need are based on the type of trucking career you plan to pursue. To obtain these endorsements, you must complete a written knowledge test successfully. Making sure you are adequately prepared for your written knowledge test will prevent you from wasting time and money. Taking practice CDL tests is the best way to get ready.

Passing your air brake test doesn’t have to be a stressful experience. Follow this important tip, and you should pass the test without a problem.

Eat and Sleep Well – Before the Ontario air brake test, ensure you eat and sleep well. A drop in blood sugar while taking the test can cause issues remembering what you have studied. You will also want to get a good night’s rest before test day. Being tired will significantly reduce alertness and hinder your ability to recall important facts when taking the test.