Texas CDL Air Brakes QUESTIONS AND
CORRECT DETAILED ANSWERS
Air brake systems combine what three different systems? - ANSWER>>Service
brakes, parking brakes and emergency brakes.
When should you drain the air tanks? - ANSWER>>After every working day.
Why drain water from the compressed air tanks? - ANSWER>>Water can freeze in
cold weather and cause brake failure.
Air brake equipped vehicles must have: - ANSWER>>A supply pressure gauge and
warning signal when psi drops below 60.
What can legally hold a parking or emergency brake in position for a truck, truck
tractor or bus? - ANSWER>>Spring pressure.
What makes the total stopping distance for air brakes longer than that for
hydraulic brakes? - ANSWER>>Brake lag distance.
The first thing you should do when the low air pressure warning comes on? -
ANSWER>>Stop and safely park ASAP.
The braking power of the spring brakes: - ANSWER>>Depends on the adjustment
of the service brakes.
The air compressor governor controls what? - ANSWER>>When air is pumped into
the air tanks.
The application pressure gauge shows the driver how much pressure: -
ANSWER>>Is being applied to the brakes.
, When you apply pressure to the brake pedal, you are... - ANSWER>>Pushing
against a spring and against air pressure to the brakes.
The air compressor is connected to the engine through... - ANSWER>>Gears or a
V-belt
Which type of brake is the most common in commercial vehicles? - ANSWER>>S-
cam brake
An application pressure gauge... - ANSWER>>Shows how much air pressure you
are applying to the brakes.
All vehicles with air brakes are required to have a low pressure warning signal.
This could be... - ANSWER>>A red light, wig wag mechanical arm or a buzzer.
To test service brakes you should... - ANSWER>>Release the parking brake, move
forward slowly and depress brakes.
Stab braking occurs when you... - ANSWER>>1. Press on a brake pedal as hard as
you can. 2. Release the brakes when the wheels lock up. 3. Apply the brakes when
the wheels start rolling.
Air brakes take longer to stop than hydraulic brakes because... - ANSWER>>It
takes longer for the air to flow through the lines.
The proper way to go down long grades is to... - ANSWER>>Apply brakes just hard
enough to reduce speed to 5 mph below safe speed then release until back to
safe speed and repeat process.
When should you avoid using the parking brake? - ANSWER>>When the brakes
are hot.
CORRECT DETAILED ANSWERS
Air brake systems combine what three different systems? - ANSWER>>Service
brakes, parking brakes and emergency brakes.
When should you drain the air tanks? - ANSWER>>After every working day.
Why drain water from the compressed air tanks? - ANSWER>>Water can freeze in
cold weather and cause brake failure.
Air brake equipped vehicles must have: - ANSWER>>A supply pressure gauge and
warning signal when psi drops below 60.
What can legally hold a parking or emergency brake in position for a truck, truck
tractor or bus? - ANSWER>>Spring pressure.
What makes the total stopping distance for air brakes longer than that for
hydraulic brakes? - ANSWER>>Brake lag distance.
The first thing you should do when the low air pressure warning comes on? -
ANSWER>>Stop and safely park ASAP.
The braking power of the spring brakes: - ANSWER>>Depends on the adjustment
of the service brakes.
The air compressor governor controls what? - ANSWER>>When air is pumped into
the air tanks.
The application pressure gauge shows the driver how much pressure: -
ANSWER>>Is being applied to the brakes.
, When you apply pressure to the brake pedal, you are... - ANSWER>>Pushing
against a spring and against air pressure to the brakes.
The air compressor is connected to the engine through... - ANSWER>>Gears or a
V-belt
Which type of brake is the most common in commercial vehicles? - ANSWER>>S-
cam brake
An application pressure gauge... - ANSWER>>Shows how much air pressure you
are applying to the brakes.
All vehicles with air brakes are required to have a low pressure warning signal.
This could be... - ANSWER>>A red light, wig wag mechanical arm or a buzzer.
To test service brakes you should... - ANSWER>>Release the parking brake, move
forward slowly and depress brakes.
Stab braking occurs when you... - ANSWER>>1. Press on a brake pedal as hard as
you can. 2. Release the brakes when the wheels lock up. 3. Apply the brakes when
the wheels start rolling.
Air brakes take longer to stop than hydraulic brakes because... - ANSWER>>It
takes longer for the air to flow through the lines.
The proper way to go down long grades is to... - ANSWER>>Apply brakes just hard
enough to reduce speed to 5 mph below safe speed then release until back to
safe speed and repeat process.
When should you avoid using the parking brake? - ANSWER>>When the brakes
are hot.
