MICHIGAN CDL - AIR BRAKES
QUESTIONS & ANSWERS(RATED
A+)
A low air pressure warning signal should activate: - ANSWERWhen tank pressure
falls below 60 psi.
In an air brake system, a low air pressure warning signal must come on if air
pressure in the tanks falls below 60 psi. This warning signal may come in the form of
a light, a buzzer, or a wig wag.
Why should you regularly drain the air tanks? - ANSWERBecause compressed air
contains some water and the water collects in the tanks.
Compressed air usually contains a certain amount of moisture and compressor oil,
which can build up in the air storage tanks and damage the brake system. The tanks
should be drained to clean out these accumulations. On a tank with a manual drain
valve, draining should be performed at the end of each day of driving.
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction
lamps to indicate when the ABS is not working. - ANSWERYellow
Vehicles with ABS have yellow malfunction lamps to alert drivers when the braking
systems are not working. Be sure you know where the malfunction lamp on your
vehicle is before beginning a trip.
A dual air brake system: - ANSWERConsists of two separate air brake systems that
share a single set of controls.
A dual air brake system is made up of two separate air brake systems. The systems
share a single set of brake controls, but each has its own air tanks, hoses, and lines.
One system typically operates the regular brakes on the rear axle or axles while the
other system operates the regular brakes on the front axle.
On trucks and buses, where are ABS malfunction lamps located? - ANSWEROn the
instrument panel
Tractors, trucks, and buses with Anti-Lock Braking Systems (ABS) have yellow
malfunction lamps located on their instrument panels. Trailers have yellow ABS
malfunction lamps on their left side, either on the front or rear corner.
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.
- ANSWER100 psi
, Before driving a vehicle with a dual air brake system, you should wait for the air
compressor to build up at least 100 psi in both the primary and secondary systems.
A safety valve is set to open at ____ pounds per square inch (psi). - ANSWER150
The safety valve protects air tanks and the rest of an air brake system from
accumulating too much air pressure. The safety valve is usually set to open at 150
psi.
Air pressure should build up in a single air system within: - ANSWERThree minutes.
In single air systems, air pressure should build from approximately 50 to 90 psi within
three minutes.
Some air brake systems use alcohol: - ANSWERTo reduce the risk of ice forming in
air brake valves.
Some air brake systems contain an alcohol evaporator. This device introduces
alcohol into the braking system to inhibit the formation of ice.
Spring brakes come on: - ANSWERWhen too much air pressure is lost.
Spring brakes come on automatically when air pressure drops to an unsafe psi level.
Instead of waiting for the spring brakes to automatically activate, you should safely
exit the road as soon as you notice the low pressure warning signal and bring your
vehicle to a stop while you are still able to control the brakes.
Anti-Lock Braking Systems (ABS): - ANSWERAre equipped in addition to other
braking systems and do not reduce normal braking power.
ABS is equipped in addition to a vehicle's normal braking system and it neither
increases nor decreases the vehicle's braking capability. ABS activates during hard
applications of the brake pedal in order to prevent wheels from locking up.
If using air tanks with manually operated drains, how often should you drain the
tanks? - ANSWEREvery day
To prevent the build up of oil and water in a vehicle's air tanks, manually operated
air tank drains should be used at the end of each day of driving.
The parking brake should be: - ANSWERUsed whenever you park your vehicle.
The parking brake in a vehicle with air brakes should be used every time the vehicle
is parked.
If the brake pads rub against the brake drums and create too much heat: -
ANSWERThe brakes may stop working.
QUESTIONS & ANSWERS(RATED
A+)
A low air pressure warning signal should activate: - ANSWERWhen tank pressure
falls below 60 psi.
In an air brake system, a low air pressure warning signal must come on if air
pressure in the tanks falls below 60 psi. This warning signal may come in the form of
a light, a buzzer, or a wig wag.
Why should you regularly drain the air tanks? - ANSWERBecause compressed air
contains some water and the water collects in the tanks.
Compressed air usually contains a certain amount of moisture and compressor oil,
which can build up in the air storage tanks and damage the brake system. The tanks
should be drained to clean out these accumulations. On a tank with a manual drain
valve, draining should be performed at the end of each day of driving.
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction
lamps to indicate when the ABS is not working. - ANSWERYellow
Vehicles with ABS have yellow malfunction lamps to alert drivers when the braking
systems are not working. Be sure you know where the malfunction lamp on your
vehicle is before beginning a trip.
A dual air brake system: - ANSWERConsists of two separate air brake systems that
share a single set of controls.
A dual air brake system is made up of two separate air brake systems. The systems
share a single set of brake controls, but each has its own air tanks, hoses, and lines.
One system typically operates the regular brakes on the rear axle or axles while the
other system operates the regular brakes on the front axle.
On trucks and buses, where are ABS malfunction lamps located? - ANSWEROn the
instrument panel
Tractors, trucks, and buses with Anti-Lock Braking Systems (ABS) have yellow
malfunction lamps located on their instrument panels. Trailers have yellow ABS
malfunction lamps on their left side, either on the front or rear corner.
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.
- ANSWER100 psi
, Before driving a vehicle with a dual air brake system, you should wait for the air
compressor to build up at least 100 psi in both the primary and secondary systems.
A safety valve is set to open at ____ pounds per square inch (psi). - ANSWER150
The safety valve protects air tanks and the rest of an air brake system from
accumulating too much air pressure. The safety valve is usually set to open at 150
psi.
Air pressure should build up in a single air system within: - ANSWERThree minutes.
In single air systems, air pressure should build from approximately 50 to 90 psi within
three minutes.
Some air brake systems use alcohol: - ANSWERTo reduce the risk of ice forming in
air brake valves.
Some air brake systems contain an alcohol evaporator. This device introduces
alcohol into the braking system to inhibit the formation of ice.
Spring brakes come on: - ANSWERWhen too much air pressure is lost.
Spring brakes come on automatically when air pressure drops to an unsafe psi level.
Instead of waiting for the spring brakes to automatically activate, you should safely
exit the road as soon as you notice the low pressure warning signal and bring your
vehicle to a stop while you are still able to control the brakes.
Anti-Lock Braking Systems (ABS): - ANSWERAre equipped in addition to other
braking systems and do not reduce normal braking power.
ABS is equipped in addition to a vehicle's normal braking system and it neither
increases nor decreases the vehicle's braking capability. ABS activates during hard
applications of the brake pedal in order to prevent wheels from locking up.
If using air tanks with manually operated drains, how often should you drain the
tanks? - ANSWEREvery day
To prevent the build up of oil and water in a vehicle's air tanks, manually operated
air tank drains should be used at the end of each day of driving.
The parking brake should be: - ANSWERUsed whenever you park your vehicle.
The parking brake in a vehicle with air brakes should be used every time the vehicle
is parked.
If the brake pads rub against the brake drums and create too much heat: -
ANSWERThe brakes may stop working.
