MB Air Brake Test 7
- Perfect for first-time and renewal commercial applicants, and those adding endorsements
- Based on 2024 MB commercial driver's licence manual
- Triple-checked for accuracy
- Updated for October 2024
questions
correct answers to pass
passing score
- What does a service brake chamber typically not contain?
- Who has the necessary qualifications to adjust automatic slack adjusters?
- How do spring brake chambers typically apply the brakes?
- What happens if stroke surpasses the adjustment limits of a brake chamber?
- What holds together most commercial vehicles' brake chambers?
- To release the spring brakes, the spring brake chamber must receive the requisite air pressure to compress the spring. At what psi is this typically accomplished?
- What is an alternate term for the action of compressing the spring?
- What are the two types of air brake chambers?
- Compressed air can exhaust at all these places EXCEPT
- Is it acceptable for the pushrod stroke to go beyond the adjustment limit?
- Why is it possible to continue driving even when the spring brakes are applied?
- What results when you press the brake pedal, and compressed air inflates the service brake chamber?
- What does 'stroke length' typically refer to?
- What is the component that links the brake chamber's pushrod to the brake assembly?
- Under which circumstances are spring brakes designed to activate?
- Compressed air is converted into...?
- At what psi does the spring brake control valve react due to a decrease in air brake system pressure?
- What equipment is used on service and supply lines to avoid air leakages when they are not being used?
- Assuming red is reserved for the supply line according to the colour-coding adopted during manufacturing of trailer couplers, what colour represents the service line?
- How do you control the trailer supply valve to provide air to the trailer?
- Is it possible to tow trailers with spring brake priority even before the service brake air tanks are filled?
- What is the consequence of the driver neglecting to close the trailer supply valve when a trailer is not attached?
- What is the main function of the supply line?
- Does a converter dolly that connects one trailer to another have a brake system essentially identical to a trailer system?
- What is another term for trailer couplers?
- Should trailer hand valves be utilized for parking or emergency stops?
- Does the air brake system on a trailer come with air tanks and automatic spring brakes?
- Cross-connecting the service and supply lines on a combination vehicle could cause all of the following EXCEPT
- Which component is not a part of the internal structure of s-cam brakes?
- What is the first action performed by trailers with service brake priority?
- Should towing vehicles designed for pulling trailers be equipped with special valves used only for the trailer?
- Once the trailer air supply valve is closed, the tractor protection valve in the tractor also closes. What impact does this have?
- The trailer supply valve closes automatically when the air pressure in the trailer supply line falls to approximately how many psi?
- What is the most prevalent type of foundation brake found on commercial vehicles with air brake systems?
- What is the main function of trailer couplers or 'gladhands'?
- What reduces the effectiveness of both the service brakes and spring brakes to halt or hold a vehicle?
- Which of the following are types of foundation brakes?
- Most towing vehicles are equipped with 'dead end' or 'dummy' couplers. What is their purpose?
- What is one way to prevent accidentally cross-connecting the lines?
- What is the primary role of the service line?
- Which type of chamber is used on some buses and motor coaches, instead of a large spring in the brake chamber?
- Why can't the components within the wheel on the S-cam brakes easily be seen?
- What is another term for the supply line?
- In an emergency when the trailer service brakes fail, how can the trailer spring brakes be applied?
- Why are the brake-assembly components at the wheels of a vehicle generally referred to as the foundation components?
- Which of the following can lead to a rapid drop in air pressure?
- To what component of the air-brake system is the brake lining attached?
- All these people EXCEPT ________ are responsible for ensuring a vehicle adheres to HIghway Traffic Act (HTA) regulations.
- Brake lining is considered defective if it is
- What does the term "brake fade" refer to?