CDL · Vehicle inspection
How should you check that the service brake is working?
Correct answer: Roll forward at about 5 mph and press the brake pedal firmly.
Answer options
- ASet the trailer parking brake and gently try to drive forward against it
- BIn a low gear, pump the pedal three times and then keep it pressed for five seconds
- CRoll forward at about 5 mph and press the brake pedal firmly Correct
Why
With normal air pressure built up and the parking brake released, roll ahead at roughly 5 mph and press the pedal firmly. The vehicle should stop without pulling to one side, feeling odd or responding late.
About this question
Topic: Vehicle inspection License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Inspecting Your Vehicle (32 questions). Take the full set and check your score.
Practice Inspecting Your VehicleMore questions from Inspecting Your Vehicle
- Which of the following should parts of the exhaust system never do?
- As you look over the tires during a pre-trip inspection, which statement is accurate?
- What problem can let toxic carbon monoxide gas get into the cab?
- Should radial tires and bias-ply tires be used together on one vehicle?
- When checking the engine compartment before a trip, which item are you NOT expected to inspect?
- How often should the service brakes be checked?
- Which of the following counts as a defect in the suspension system?
- Above all, why should you inspect your vehicle?
Practice on your phone.
Practice here in your browser, or use the app with the same questions and explanations. It's free on the App Store.