Air Brakes Flashcards
A low air pressure warning signal should activate:
When tank pressure falls below 60 psi.
Why should you regularly drain the air tanks?
Because compressed air contains some water and the water collects in the tanks
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to
indicate when the ABS is not working.
Yellow
A dual air brake system:
Consists of two separate air brake systems that share a single set of controls.
A safety valve is set to open at ____ pounds per square inch (psi).
150
Air pressure should build up in a single air system within:
Three minutes.
Some air brake systems use alcohol:
To reduce the risk of ice forming in air brake valves.
Spring brakes come on:
When too much air pressure is lost.
On trucks and buses, where are ABS malfunction lamps located?
On the instrument panel
Before driving a vehicle with a dual air brake system, you must wait for the air compressor to
build a minimum of ____ in both the primary and secondary systems.
100 psi
Anti-Lock Braking Systems (ABS):
Are equipped in addition to other braking systems and do not reduce normal braking
power.
If using air tanks with manually operated drains, how often should you drain the tanks?
Every day
The parking brake should be:
Used whenever you park your vehicle.
If the brake pads rub against the brake drums and create too much heat:
The brakes may stop working.
A low air pressure warning signal:
Is required on vehicles with air brakes.
Foundation brakes are used:
At each wheel.
The air compressor governor controls:
When the air compressor pumps air into the air storage tanks.
When traveling down a steep downgrade:
Shift into a lower gear, then use brakes to supplement the braking effect of the engine.
To confirm that a trailer has ABS, you can:
Look under the trailer for wheel speed sensors coming from the back of the brakes.
Dollies equipped with ABS are required to have malfunction lamps located where?
On the left side