Air Breaks Flashcards
Your truck or bus has a dual air break system. If low air pressure warning comes on for only one system, what should you do?
Stop. Safely park, and continue only after the system is fixed
If your vehicle has an alcohol evaporator, everyday during cold weather you should?
Check and fill the alcohol level
Compressed air is stored in the
I’m the storage tank
A straight truck or bus air break system should not leak at a rate of…. Per minutes with the engine off and the breaks released
2PSI per minute
When a safety valve releases air it means that..
-the pressure has exceeded 150 psi
-too much air is in the air compressor
-something is wrong, and you should have it checked by a mechanic
All of the above
You should know your breaks are fading when
You have to push harder on the break pedal to control your speed and to downgrade
The air compressor governor controls
When the air compressor pumps air into the storage tanks
An air tanks is equipped with a drain valve to remove
Water and oil
To check the slack adjuster on S cam breaks, you should
Wear gloves and pull hard on each slack adjuster
To check the free play of manual slack adjusters on a cam breaks you should
Park on level ground, chock the wheels and release the parking breaks
The application pressure valve shows the driver how much pressure
Is being applied to the breaks
If your air compressor stops working
You will still have air pressure in your tanks
Your vehicle single break system needs adjustment if
If the compressor cuts out between 70 to 90 psi
Air breaks take longer to stop that hydraulic breaks because
It takes longer for air to flow through the line
When low pressure warning is activated, you should
Bring the vehicle to a safe stop while you can still control the breaks
If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to
Release the spring breaks to move a short distance
Slack adjusters….
Can be adjusted manually or automatically
You should not use the parking breaks
When parking breaks are hot
What can legally hold a parking or emergency break in position for a truck, truck tractor or bus?
Spring pressure
In air break vehicles the parking breaks should be used when
Whenever the vehicle is parked
The air pressure governor controls
When air is pumped into the air tanks
The most common types of foundation breaks found in heavy vehicles is the
S-cam drum
If the air compressor should develop a leak, what keeps the air in the tanks
The one way check valve
The proper way to go down long grades is to……?
Use a low gear and apply light pressure on the breaks
