Ontario Air Brake Test - Quiz 04 (30) Flashcards
You should begin a test of the low air pressure warning device with the pressure above…?
621 kPa (90 psi)
When applying a test to the spring brakes, the test is only passed if…?
The vehicle only rocks slightly
a. The wheels do not turn the more than three quarters of a revolution
b. The vehicle only rocks slightly
c. The wheels do not turn more than two revolutions
d. The vehicle does not travel forward more than 2 m
A straight truck, tractor or bus must not lose air pressure with the brakes fully applied at a rate of more than…?
21 kPa (3 psi) per minute
a. 21 kPa (3 psi) per minute
b. 37 kPa (5.3 psi) per minute
c. 34 kPa (5 psi) per minute
d. 25 kPa (3.6 psi) per minute
The amount of moisture discharged from tanks other than the supply tank should be…?
Less than that from the supply tank
a. Less than that from the supply tank
b. The same as that from the supply tank
c. Any of these
d. More than that from the supply tank
The outer cover of an air line has been damaged, but there is no leak to the inner tube. What action should you take?
Have the line replaced
a. Make a note to monitor it
b. None
c. Have the line replaced
d. Wrap the damaged area with tape
You should make sure that air tanks are securely attached to the vehicle by…?
Pulling on them
a. Looking at them
b. Any of these
c. Pulling on them
d. Tapping them
When checking air brake chambers, you should be looking out for…?
All of these things
a. Non-manufactured holes
b. Mismatched slack adjuster lengths
c. Cracks
If a vehicle has a foundation brake defect, the Ontario Highway Traffic Act specifies that it may not…?
Be operated on any road or highway
a. Be operated on any high speed road
b. Be operated on any road or highway
c. Be operated on the road except to be taken to be fixed
d. Be operated in urban areas
The low air pressure warning device is defective if it fails to activate at a minimum level of…?
380 kPa (55 psi)
a. 380 kPa (55 psi)
b. 480 kPa (69 psi)
c. 180 kPa (26 psi)
d. 280 kPa (40 psi)
If air brake chambers on different sides of an axle are different sizes, this may cause…?
Braking imbalances
a. Skidding
b. Braking imbalances
c. Tire wear
d. Reduced braking force
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…?
Two minutes
Brake lining is the friction material that is fastened to…?
The brake shoe
The discovery of a small quantity of oil is only no cause for concern if it comes from…?
The supply tank
Air compressors should always be inspected with…?
The engine off
An air pressure buildup time test should be made with the engine idling between…?
600 - 900 RPM
The amount of air loss from a system should be measured with the brake fully applied for how long?
One minute
A tractor protection valve should be tested by disconnecting the trailer service line and then…?
Applying the brake pedal
When checking a vehicle’s brake drums, you should be looking out for…?
Cracks
Actual cut-out pressure must never be higher than…?
1000 kPa (145 psi)
A tractor hauling two or more trailers must not lose air pressure with the brakes fully applied at a rate of more than…?
41 kPa per minute
The minimum pressure for compressor cut-in is…?
552 kPa (80 psi)
When testing the spring brakes on a towing vehicle and trailer, it is preferable to perform the test on…?
The towing vehicle
You must never make an inspection of your brakes unless…?
All of these apply
a. All of these apply
b. Wheel chocks or blocks are in place
c. The spring brakes are applied
d. The vehicle is on level ground
Brake lining can be contaminated by…?
Grease and Oil
