- Based on 2025 SK commercial driver's licence manual
- Updated for January 2025
SK Air Brake Test 14
- Perfect for first-time and renewal commercial applicants, and those adding endorsements
- Triple-checked for accuracy
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- When the ABS begins to operate, your immediate reaction should be?
- Can tractors and trailers equipped with ABS be combined with those lacking ABS without affecting the ABS functionality?
- Which of these is not a part of the basic configuration of an ABS?
- What is Automatic Traction Control (ATC)?
- If the primary circuit fails and a brake application is made, where is control air from the foot valve directed to?
- In a tractor and trailer combination with spring parking brakes, what happens when the spring parking brake control valve is closed?
- Which system shares many the same sensing and control components with the automatic traction control (ATC) system?
- In a vehicle equipped with Automatic Traction Control (ATC), how is the driver alerted when wheel slip is detected?
- What does the ABS do when it detects a wheel locking up during a brake application?
- The spring parking brakes with a modulator valve perform how many functions?
- When a brake application is made and the system detects a wheel locking up, how does the ECU respond?
- Where can the system warning light for trailers with ABS typically be found?
- What best describes an anti-lock brake system (ABS)?
- Are old and new tractor and trailer systems interchangeable with respect to those with spring parking brakes?
- In a vehicle equipped with an air brake system with manual slack adjusters, can the brake pedal be pumped to compensate for brakes that are out of adjustment?
- In a vehicle equipped with Automatic Traction Control (ATC), what happens if wheel slip is detected while the vehicle's cruise control is set?
- As the air pressure drops below 85 psi, what happens to the spring parking brakes?
- How is electronic engine control activated?
- When does differential braking occur?
- If air in the primary circuit is lost, the spring-brake modulator valve allows the driver to still use the brake pedal to apply the brakes. Until when can brake applications be repeated?
- Does the air brake system remain the same even with the addition of ABS components?
- Is it possible for a trailer with a basic air brake system to be towed by a tractor with a dual air brake system?
- Which of the following typically causes brake failures?
- Select the incorrect steps when adjusting S-cam brakes with manual slack adjusters.
- What should you do at your first stop after adjusting the brakes?
- When doing a pre-trip inspection, at how many psi should the warning devices function?
- You can stay aware of the condition of your vehicle's braking system by doing all of these EXCEPT
- What is not a step to determine if an S-cam brake with manual or automatic slack adjusters needs adjustment?
- After two inches of push rod stroke, what happens to the force available at the push rod?
- When brakes are adjusted by slack adjusters, where do the shoes move?
- Identify the incorrect statement about the steps to determine if an S-cam brake with manual slack adjusters needs adjustment.
- When testing the low air pressure warning devices, why should you release the spring parking brake after pressure builds to 90 psi?
- After adjusting the manual slack adjuster, by what amount should the adjustment bolt be backed off?
- How long should the pre-trip air brake inspection take?
- Why is brake shoe adjustment necessary?
- Who should you consult regarding the adjustment procedure for various air disc brakes?
- If the S-cam brakes with automatic slack adjusters are severely out of adjustment, who should inspect them?
- What is not typically part of a brake test?
- During a leakage check, the pressure should not fall more than how many psi per minute?
- All of these can negatively affect a vehicle's braking ability EXCEPT
- When checking the S-cam brake adjustment with a manual slack adjuster, what should you ensure?
- What is the most reliable method to ensure your vehicle brakes are properly adjusted?
- What is not checked during an in-service check before a long or steep downgrade?
- When the brakes are out of adjustment, braking efficiency is reduced by all of these EXCEPT
- When is it recommended to adjust automatic slack adjusters by hand?
- How frequently should you check automatic slack adjusters?
- Who has the responsibility to ensure that the vehicle has safe, properly adjusted brakes?
- Identify the incorrect statement. During a pre-trip inspection, you should check the drive belt and pulleys for...
- For S-cam brakes, what could increase the overall push rod travel?
- What is not a required step while performing a manual wedge brake adjustment?