CDL COMBINATION VEHICLES
ENDORSEMENT PRACTICE ASSESSMENT
2026 FULL QUESTIONS SOLUTION
BLUEPRINT
● What is the safest way to turn right from a two-way road? Answer:
Turn wide as you complete the turn
● To test the tractor protection valve, charge the trailer air brake system,
turn off the engine, and Answer: Step on and off the brake pedal several
times
● Even before ABS were required, some vehicles already had them.
How can you check if your vehicle has ABS Answer: Look under the
vehicle fro the electronic control unit (ECU) and wheel speed sensor
wires coming from the back of the brakes
● Before you start to uncouple, you must Answer: make sure the ground
is solid and can support the weight of the trailer
● After coupling, make sure that the air lines a re not crossed. How
should you do this? Answer: Adjusting the air supply knob to send air to
the trailer brakes. Turn off the engine once the air pressure normalizes.
Then listen for the sound of escaping air as the brakes are released.
ENDORSEMENT PRACTICE ASSESSMENT
2026 FULL QUESTIONS SOLUTION
BLUEPRINT
● What is the safest way to turn right from a two-way road? Answer:
Turn wide as you complete the turn
● To test the tractor protection valve, charge the trailer air brake system,
turn off the engine, and Answer: Step on and off the brake pedal several
times
● Even before ABS were required, some vehicles already had them.
How can you check if your vehicle has ABS Answer: Look under the
vehicle fro the electronic control unit (ECU) and wheel speed sensor
wires coming from the back of the brakes
● Before you start to uncouple, you must Answer: make sure the ground
is solid and can support the weight of the trailer
● After coupling, make sure that the air lines a re not crossed. How
should you do this? Answer: Adjusting the air supply knob to send air to
the trailer brakes. Turn off the engine once the air pressure normalizes.
Then listen for the sound of escaping air as the brakes are released.
