TEXAS CDL AIR BRAKES EXAM, PRACTICE EXAM AND
STUDY GUIDE NEWEST 2025-2026 ACTUAL EXAM 250
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
(VERIFIED ANSWERS) |ALREADY GRADED A
You are driving on a straight, level highway at 50 mph. There are no vehicles in front of you. Suddenly a
tire blew out of your vehicle, what should you do first? - answer-Stay off the brake until the vehicle has
slowed down.
Which of the following systems should receive extra attention during winter weather inspection? -
answer-Exhaust.
What happens to tar on the road pavement during hot weather? - answer-It bleeds making the road
surface slippery.
What is the best advice for drivers when a heavy fog occurs? - answer-Park the truck until the fog
disappears.
In mountain driving you will have to use a lower gear to drive safely on a grade. Which of these does
NOT affect your choice of gear? - answer-Tire thread's depth.
What should you do before driving in mountains? - answer-Know escape ramps location on your way.
Escape ramps: - answer-Should be used by any driver who loses braking power.
Which of these is true about notifying the authorities after an accident occurs? - answer-If you have a
cellular phone or CB radio you should notify the authorities before exiting the vehicle.
If you are not sure what to use to put out a hazardous material fire you should: - answer-Wait for fire
fighters.
Which of these is NOT a danger of a rough acceleration? - answer-Tire damage.
,Which of these lights cannot be checked at the same time? - answer-Turn signals, brake lights, and
fourway flashers.
You are inspecting hydraulic brakes. You should pump the brake pedal three times then apply firm
pressure to the pedal for five seconds. If the brakes are working properly, the pedal should: - answerNot
move.
Drivers of trucks and tractor-trailers with cargo must check that the cargo is well secured within the first
__ miles of the trip. - answer-50
When starting a bus on a level surface with good traction, there is often no need for: - answer-Parking
brakes.
How does the weight of the vehicle affect stopping distance? - answer-Empty trucks take longer to stop
than if loaded, but this is not the normal case for buses.
When you are starting to move up a hill from a stop: - answer-Release the parking brakes as you apply
engine power.
What is true about using a heater? - answer-When driving in winter weather, you should check that the
heater is working properly before starting your trip.
Why is damage to the exhaust system a danger? - answer-Poisonous fumes can enter the cab or sleeping
compartment.
Which of these is NOT a danger when an automatic transmission is forced into a low gear at a high
speed? - answer-A loss of steering control.
Perception distance is the distance your vehicle travels from the time: - answer-The eyes see a hazard to
the time the brain knows it is a hazard.
Extra care is needed to keep your vehicle centered in your lane because commercial vehicles: -
answerAre often wider than other vehicles.
, You should lightly apply your brakes to flash the brake lights if: - answer-You are about to exit the road
and need to slow down.
Merging to the road is safest if you: - answer-Wait for a large enough gap in traffic to enter the road.
Which of these is NOT something you should do if your headlights are not working properly? -
answerLeave on your high beams.
You are driving a truck with a manual transmission. What gear will you probably have to use to take a
long, steep downhill grade? - answer-A lower gear than you would use to climb the hill.
You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true? -
answer-Rust around wheel nuts may mean that they are loose.
You are checking your tires for a pre-trip inspection. Which of these statements is true? - answer-Tires of
mismatched sizes should not be used together in the same vehicle.
If a straight vehicle (no trailer or articulation) goes into a front wheel skid it will: - answer-Go straight
ahead even if the steering wheel is turned
If you need to leave the road in a traffic emergency, you should: - answer-Avoid braking until your speed
has dropped to about 20 mph.
Which of these statements about certain types of cargo is true? - answer-Unstable load such as hanging
meat or livestock can require extra caution on curves.
According to the driver's manual, why should you limit the use of your horn? - answer-It can startle
other drivers.
You do not have a hazardous materials endorsement on your commercials driver's license. You are asked
to deliver hazardous materials in a placarded vehicle. You should: - answer-Refuse to haul the load.
STUDY GUIDE NEWEST 2025-2026 ACTUAL EXAM 250
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
(VERIFIED ANSWERS) |ALREADY GRADED A
You are driving on a straight, level highway at 50 mph. There are no vehicles in front of you. Suddenly a
tire blew out of your vehicle, what should you do first? - answer-Stay off the brake until the vehicle has
slowed down.
Which of the following systems should receive extra attention during winter weather inspection? -
answer-Exhaust.
What happens to tar on the road pavement during hot weather? - answer-It bleeds making the road
surface slippery.
What is the best advice for drivers when a heavy fog occurs? - answer-Park the truck until the fog
disappears.
In mountain driving you will have to use a lower gear to drive safely on a grade. Which of these does
NOT affect your choice of gear? - answer-Tire thread's depth.
What should you do before driving in mountains? - answer-Know escape ramps location on your way.
Escape ramps: - answer-Should be used by any driver who loses braking power.
Which of these is true about notifying the authorities after an accident occurs? - answer-If you have a
cellular phone or CB radio you should notify the authorities before exiting the vehicle.
If you are not sure what to use to put out a hazardous material fire you should: - answer-Wait for fire
fighters.
Which of these is NOT a danger of a rough acceleration? - answer-Tire damage.
,Which of these lights cannot be checked at the same time? - answer-Turn signals, brake lights, and
fourway flashers.
You are inspecting hydraulic brakes. You should pump the brake pedal three times then apply firm
pressure to the pedal for five seconds. If the brakes are working properly, the pedal should: - answerNot
move.
Drivers of trucks and tractor-trailers with cargo must check that the cargo is well secured within the first
__ miles of the trip. - answer-50
When starting a bus on a level surface with good traction, there is often no need for: - answer-Parking
brakes.
How does the weight of the vehicle affect stopping distance? - answer-Empty trucks take longer to stop
than if loaded, but this is not the normal case for buses.
When you are starting to move up a hill from a stop: - answer-Release the parking brakes as you apply
engine power.
What is true about using a heater? - answer-When driving in winter weather, you should check that the
heater is working properly before starting your trip.
Why is damage to the exhaust system a danger? - answer-Poisonous fumes can enter the cab or sleeping
compartment.
Which of these is NOT a danger when an automatic transmission is forced into a low gear at a high
speed? - answer-A loss of steering control.
Perception distance is the distance your vehicle travels from the time: - answer-The eyes see a hazard to
the time the brain knows it is a hazard.
Extra care is needed to keep your vehicle centered in your lane because commercial vehicles: -
answerAre often wider than other vehicles.
, You should lightly apply your brakes to flash the brake lights if: - answer-You are about to exit the road
and need to slow down.
Merging to the road is safest if you: - answer-Wait for a large enough gap in traffic to enter the road.
Which of these is NOT something you should do if your headlights are not working properly? -
answerLeave on your high beams.
You are driving a truck with a manual transmission. What gear will you probably have to use to take a
long, steep downhill grade? - answer-A lower gear than you would use to climb the hill.
You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true? -
answer-Rust around wheel nuts may mean that they are loose.
You are checking your tires for a pre-trip inspection. Which of these statements is true? - answer-Tires of
mismatched sizes should not be used together in the same vehicle.
If a straight vehicle (no trailer or articulation) goes into a front wheel skid it will: - answer-Go straight
ahead even if the steering wheel is turned
If you need to leave the road in a traffic emergency, you should: - answer-Avoid braking until your speed
has dropped to about 20 mph.
Which of these statements about certain types of cargo is true? - answer-Unstable load such as hanging
meat or livestock can require extra caution on curves.
According to the driver's manual, why should you limit the use of your horn? - answer-It can startle
other drivers.
You do not have a hazardous materials endorsement on your commercials driver's license. You are asked
to deliver hazardous materials in a placarded vehicle. You should: - answer-Refuse to haul the load.
