TEXAS CDL AIR BRAKES EXAM | QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS | LATEST EXAM UPDATE
Air Brakes... - CORRECT ANSWER - Use compressed air to make the brakes
work- good for stopping large and heavy vehicles
3 Different Braking Systems - CORRECT ANSWER - Service Brake, Parking
Brake, and Emergency Brake
Service Brake System - CORRECT ANSWER - applies and releases the brakes
by using the brake pedal during normal driving
Parking Brake System - CORRECT ANSWER - Applies and releases the parking
brakes when you use the parking brake control
Emergency Brake System - CORRECT ANSWER - Uses parts of the service and
parking brake system to stop the vehicle in event of a brake system failure.
Air Compressor - CORRECT ANSWER - pumps air into the storage tanks
How is the air compressor connected to the engine? - CORRECT ANSWER -
Through gears or a v-belt.
If the compressor has its own oil supply - CORRECT ANSWER - check the oil
every day before driving
,Air Compressor Governor - CORRECT ANSWER - Controls when the air
compressor will pump air into the air storage tanks
Air Tank pressure cut out level - CORRECT ANSWER - 125 psi (pounds per
square inch)
When air tank pressure rises to the "cut-out" level - CORRECT ANSWER - the
governor stops the compressor from pumping air
Air Tank pressure cut in level - CORRECT ANSWER - 100 psi
When does the compressor start pumping again? - CORRECT ANSWER - When
the air tank pressure falls to the cut in level
Air storage tanks - CORRECT ANSWER - Hold Compressed Air- enough air to
allow the brakes to be used several times
Air Tank Drains - CORRECT ANSWER - Allows the storage tanks to be drained
of oil and water, to prevent frozen air lines/brake failure.
What is bad for the air brake system? - CORRECT ANSWER - compressed air
usually has some water and some compressor oil in it
Manually and Automatically - CORRECT ANSWER - Two ways to drain air
tanks- drain valve in bottom
, Manually draining - CORRECT ANSWER - Quarter turn or pulling a cable-
every day
Automatic Draining - CORRECT ANSWER - Water and oil are automatically
drained for you
Automatic tank drains also have - CORRECT ANSWER - electric heating
devices- prevent freezing of drain in cold weather
Alcohol Evaporator - CORRECT ANSWER - puts alcohol into the air system to
reduce the risk of ice
-Check and fill up as necessary, every day in cold weather
Safety Valve - CORRECT ANSWER - protects the tank and system from too
much pressure
usually set to open at 150 psi
Brake Pedal - CORRECT ANSWER - AKA foot valve or treadle valve
Pushing down brake pedal harder - CORRECT ANSWER - applies more air
pressure
Foundation Brakes - CORRECT ANSWER - Used at each wheel. Most common
being the S-Cam drum Brake
Brake Drums - CORRECT ANSWER - Each vehicle's axle- shes and lining push
against drum, causes friction and slows vehicle down
VERIFIED AND WELL DETAILED ANSWERS | LATEST EXAM UPDATE
Air Brakes... - CORRECT ANSWER - Use compressed air to make the brakes
work- good for stopping large and heavy vehicles
3 Different Braking Systems - CORRECT ANSWER - Service Brake, Parking
Brake, and Emergency Brake
Service Brake System - CORRECT ANSWER - applies and releases the brakes
by using the brake pedal during normal driving
Parking Brake System - CORRECT ANSWER - Applies and releases the parking
brakes when you use the parking brake control
Emergency Brake System - CORRECT ANSWER - Uses parts of the service and
parking brake system to stop the vehicle in event of a brake system failure.
Air Compressor - CORRECT ANSWER - pumps air into the storage tanks
How is the air compressor connected to the engine? - CORRECT ANSWER -
Through gears or a v-belt.
If the compressor has its own oil supply - CORRECT ANSWER - check the oil
every day before driving
,Air Compressor Governor - CORRECT ANSWER - Controls when the air
compressor will pump air into the air storage tanks
Air Tank pressure cut out level - CORRECT ANSWER - 125 psi (pounds per
square inch)
When air tank pressure rises to the "cut-out" level - CORRECT ANSWER - the
governor stops the compressor from pumping air
Air Tank pressure cut in level - CORRECT ANSWER - 100 psi
When does the compressor start pumping again? - CORRECT ANSWER - When
the air tank pressure falls to the cut in level
Air storage tanks - CORRECT ANSWER - Hold Compressed Air- enough air to
allow the brakes to be used several times
Air Tank Drains - CORRECT ANSWER - Allows the storage tanks to be drained
of oil and water, to prevent frozen air lines/brake failure.
What is bad for the air brake system? - CORRECT ANSWER - compressed air
usually has some water and some compressor oil in it
Manually and Automatically - CORRECT ANSWER - Two ways to drain air
tanks- drain valve in bottom
, Manually draining - CORRECT ANSWER - Quarter turn or pulling a cable-
every day
Automatic Draining - CORRECT ANSWER - Water and oil are automatically
drained for you
Automatic tank drains also have - CORRECT ANSWER - electric heating
devices- prevent freezing of drain in cold weather
Alcohol Evaporator - CORRECT ANSWER - puts alcohol into the air system to
reduce the risk of ice
-Check and fill up as necessary, every day in cold weather
Safety Valve - CORRECT ANSWER - protects the tank and system from too
much pressure
usually set to open at 150 psi
Brake Pedal - CORRECT ANSWER - AKA foot valve or treadle valve
Pushing down brake pedal harder - CORRECT ANSWER - applies more air
pressure
Foundation Brakes - CORRECT ANSWER - Used at each wheel. Most common
being the S-Cam drum Brake
Brake Drums - CORRECT ANSWER - Each vehicle's axle- shes and lining push
against drum, causes friction and slows vehicle down
