AB Air Brake Test 6
- Perfect for first-time and renewal commercial applicants, and those adding endorsements
- Based on 2024 AB commercial driver's licence manual
- Triple-checked for accuracy
- Updated for December 2024
questions
correct answers to pass
passing score
- If the weight of a vehicle is doubled, how much braking power is required?
- For which licensing class is an air brake endorsement not required?
- What is transformed into heat energy by the brakes?
- Are students expected to prove they can confirm correct brake adjustment during the course?
- Who has the responsibility of administering the air brake knowledge test?
- How much would the braking force need to increase if both weight and speed of a vehicle are doubled?
- What happens to the heat generated in the brakes during braking?
- Besides air pressure purge, what else is it referred to as?
- At what pressure value does the air brake system's governor cut out?
- From where is the air compressor directly powered?
- What is the main function of air dryers in an air brake system?
- When would the contaminants drain most effectively from an air brake system?
- Which brake system generates more force?
- What is the purpose of a lanyard pull cable in an air brake system?
- What is the role of Inline Alcohol Injectors in an air brake system?
- How is compressed air defined in the context of air brakes?
- What component regulates the air compressor as needed to maintain air pressure?
- How does the air brake system compensate for a small air leak?
- Which of these is not a reason for the slow build-up of air pressure?
- Who should ensure the proper functioning of air brakes?
- Which statement is incorrect about air brakes?
- How is air pressure typically measured in an air brake system?
- The governor cuts in at _______ below the cut–out pressure.
- Where are the drain valves located in an air brake system?
- Where would the driver be when control and quick release valves exhaust forcefully?
- How is the air pressure monitored in an air brake system?
- What does a kilopascal (kPa) measure in air brake systems?
- After running the engine at 1200 rpm, how long will it take the compressor to build from 50 to 90 PSI?
- Is it required to wear personal protective equipment when servicing air brake systems?
- Which of the following statements is not true about air brakes?
- What is an alternative name for the supply tank in air brake systems?
- Which is false about the supply tank in air brake systems?
- How often should the supply tanks in an air brake system be drained?
- What is the role of the supply circuit in an air brake system?
- Why is the presence of safety valves necessary in an air brake system?
- Before performing any air brake system maintenance, should the air tanks be drained?
- After air is pressurized by the air compressor, where is it pumped to?
- What is the function of brake chambers in a commercial vehicle's braking system?
- What is the primary role of a check valve in a commercial vehicle's air brake system?
- Why is it important to only use the right kind of air brake antifreeze in the alcohol evaporator or alcohol injectors of the air brake system?
- How many air lines typically connect to the trailer in an air brake system?
- In an air brake system, does each axle group in a power unit have its own independent service brake circuit?
- Besides the steering axle, for which other axle does a power unit have a service circuit?
- Upon what is a service tank's capacity established?
- What is the most common size of brake chambers for load-bearing axles?
- What component is not part of the service brake circuit?
- How would you know if a trailer should not have alcohol-based antifreeze?
- What is installed near the brake chambers to cut down on lag time?
- How many full-service brake applications should the capacity of the air tank be able to sustain?
- At what point can the tanks in an air brake system be properly drained?