Air Brakes

Test your knowledge of air brake systems, components, and safety procedures. If you want to drive trucks with air brakes, you need to pass this test. Practice for free and build your confidence before test day.

Air Brakes Quiz

Why drain water from compressed air tanks?(Required)
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?(Required)
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _________ psi.(Required)
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _________ psi.(Required)
Parking or emergency brakes of trucks and buses can be legally held on by __________ pressure.(Required)
Your truck or bus has a dual brake system. If a low air pressure warning comes on for only one system, what should you do?(Required)
The air compressor stops pumping air at what psi?(Required)
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:(Required)
The safety valve is set automatically when pressure is:(Required)
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _______ psi.(Required)
If your vehicle has an alcohol evaporator, every day during cold weather you should:(Required)
During normal driving, spring brakes are usually held back by:(Required)
The braking power of the spring brakes:(Required)
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi witihin how many seconds?(Required)
The application pressure gauge shows how much air pressure you:(Required)
Your truck has a dual air system and one of the system loses its pressure. What will happen?(Required)
A straight truck or bus air brake system should not leak at the rate of more than ___________ psi per minute with the engine off and the brakes released.(Required)
Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of an alcohol?(Required)
The most common type of foundation brake found on heavy vehicles is the:(Required)
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:(Required)
If you must make an emergency stop, you should brake so you:(Required)
Excessive use of the service brakes results in overhearing which can lead to:(Required)
How should you check that your service brakes are working properly?(Required)

Name(Required)