Quiz 01 (30) Flashcards
Many vehicle manufacturers recommend draining moisture and oil from a vehicle’s air tanks at what interval?
Daily.
A braking system works by converting mechanical energy into what?
Heat.
Which of these persons can perform brake readjustments on manual and automatic slack adjusters?
Certified technicians
Spring brakes will normally start to apply when system pressure drops below…?
414 kPa (60 psi)
As you press down on the brake pedal, what happens to the valve which is attached to it?
It opens wider.
A warning device must alert the driver if the pressure in the air brake system falls to what level?
380 kPa (55 psi)
Why do air brake systems have dual-service tanks?
For safety
In an air brake system, what does the governor do?
Regulates the air pressure
Spring brakes are applied when…?
Air pressure leaves the brake chamber
In an air brake system, what purpose does the alcohol evaporator serve?
To prevent freezing
Which of these vehicles is most likely to have air brakes?
A school bus
Which is the only one of these that is part of a disc brake system?
Rotor
When draining tanks on an air brake system, which tank should be drained first?
The supply tank
The actual air brake system pressure range must never be lower than 552 kPa (80 psi) or higher than….
1000 kPa (145 psi)
The pushrod stroke is produced by compressed air entering…?
The brake chamber
Why is it important for you to know where compressed air from the air brake system on your vehicle exhausts?
Because it can be dangerous
Where will you find the air pressure gauge for an air brake system?
On the vehicle dashboard
The spring brake subsystem is designed for which of these?
Parking and emergencies
If you are driving and a warning tells you that your air pressure is low, what should you do?
Stop immediately
The air tanks for an air brake system can be found where?
Under or around the frame of the vehicle
The supply tank for an air brake system does what?
Collects moisture and oil from the air
At what pressure do safety valves on air brake systems normally open?
1035 kPa (150 psi)
If an air brake system has an air dryer, where will it be found?
Between the compressor and the supply tank
Under the Ontario Highway Traffic Act, an air brake system should never drop below what pressure?
552 kPa (80 psi)
Moisture in an air brake system can be dangerous for what reason?
All of these:
It can cause corrosion
It can freeze in cold temperatures
It can reduce the volume of air
In a normal braking situation, most modern air brake vehicles will use automatic valves to do what?
Reduce the pressure at the front wheels
Which of these can you expect from an air brake system that you will not get in a hydraulic brake system?
A split second delay
The air compressor for an air brake system draws its power from where?
The vehicle’s engine
Where will you find air brake chambers?
On each wheel
In an air brake system, the service brake subsystem is used for what?
Normal braking
