Rhode Island CDL Air Brake Test (RI) 2026

5 out of 5 (40 votes)
80% Passing score
20 Questions
4 Mistakes allowed
We know the importance of thorough preparation when it comes to earning your CDL air brakes endorsement. Our Rhode Island CDL air brakes practice test offers a comprehensive set of 20 multiple-choice questions designed to cover every aspect of air brake systems. The questions you'll encounter dive deep into the key components like compressors, reservoirs, and brake chambers, ensuring you understand their functions and the operational principles behind them. Safety protocols are also a major focus, providing you with the knowledge needed to handle these systems effectively and safely. One unique feature of air brakes is the brake lag time, a critical factor you must account for when calculating stopping distances. Our RI DMV practice test includes questions specifically about this, helping you grasp how to adjust your driving to accommodate this lag and maintain safety on the road. The format of our Rhode Island DMV air brake test mirrors the actual written permit test, utilizing multiple-choice and true or false questions. This similarity helps you get used to the process of eliminating incorrect answers, honing your skills to find the correct ones with confidence. All questions are based on the official RI driver's manual, the very same resource used for the real DMV permit test. This ensures that the material you study here is relevant and accurate, directly reflecting what you will face on test day. At the end of the Rhode Island practice permit test, you'll receive a detailed summary of your performance. This summary highlights the questions you answered incorrectly, providing the correct answers to aid your learning process. This feedback loop is essential for reinforcing your understanding and identifying areas where you might need further review. Achieving a passing score on this CDL air brake test requires correctly answering at least 16 out of 20 questions. This benchmark is set to ensure you're well-prepared and confident in your ability to handle air brake systems, paving the way for safe and efficient driving practices.
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Sample Rhode Island Air Brakes Test Questions

Question 1

You should avoid applying the parking brakes while the brakes are extremely hot after descending a steep grade.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

Very hot brakes can be damaged if the parking brakes are applied immediately after a steep descent. On a level surface, use wheel chocks to secure the vehicle while the brakes cool. The parking brakes may be used after the brakes are no longer excessively hot.

Source: Rhode Island Commercial Driver License Manual — § 5.4.8, “Parking Brakes”

Question 2

During a low-speed service-brake test, pulling to either side can indicate that the brakes are not operating correctly.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

Rhode Island's inspection procedure calls for moving forward at about 5 mph, applying the service brake, and coming to a complete stop. The vehicle should stop effectively without pulling to either side. Pulling, delayed stopping, or an unusual pedal feel can indicate a brake problem that must be addressed before driving.

Source: Rhode Island Commercial Driver License Manual — § 11.1.1, “Service Brake Check”, Rhode Island Commercial Driver License Manual — § 5.3, “Test Service Brakes”

Question 3

On most large air-brake vehicles, spring brakes provide:

  1. A Parking braking only
  2. B Normal service braking only
  3. C Mechanical parking and emergency braking
  4. D The primary braking force for routine stops

Correct answer: C – Mechanical parking and emergency braking

The Rhode Island CDL manual describes spring brakes as the usual method of providing mechanically held parking and emergency brakes. Air pressure holds the powerful springs back during normal driving; releasing or losing that pressure allows the springs to apply the brakes. Spring brakes are not intended to replace the service brakes during routine stops.

Source: Rhode Island Commercial Driver License Manual — § 5.1.14, “Spring Brakes”, Rhode Island Commercial Driver License Manual — § 5.1.15, “Parking Brake Controls”

Question 4

How should you check the free play of accessible manual slack adjusters on S-cam brakes?

  1. A Apply the service brakes and attempt to move each adjuster
  2. B Drain all air pressure and adjust the brakes immediately
  3. C Park level, chock the wheels, release the parking brakes, and pull the adjusters firmly
  4. D Apply the emergency brakes and rock the vehicle

Correct answer: C – Park level, chock the wheels, release the parking brakes, and pull the adjusters firmly

Park on level ground and chock the wheels before releasing the parking brakes. Wearing gloves, pull firmly on each accessible manual slack adjuster. Movement of more than about one inch where the pushrod attaches indicates that the brake probably needs adjustment and should be properly serviced.

Source: Rhode Island Commercial Driver License Manual — § 5.3.2, “Check Slack Adjusters on S-cam Brakes”

Question 5

Which statement about the heat produced during braking is correct?

  1. A Brake drums cool almost immediately after a stop
  2. B Brakes become more effective as they overheat
  3. C A heavier vehicle makes the brakes work harder and absorb more heat
  4. D Vehicle weight has no effect on the work required from the brakes

Correct answer: C – A heavier vehicle makes the brakes work harder and absorb more heat

The heavier a vehicle is, the more work its brakes must perform to bring it to a stop, and the more heat the brakes absorb. Excessive heat can cause brake fade by reducing lining friction and expanding brake drums. Drivers must control speed and avoid overusing the service brakes, especially on long or steep downgrades.

Source: Rhode Island Commercial Driver License Manual — § 2.6.1, “The Effect of Vehicle Weight on Stopping Distance”, Rhode Island Commercial Driver License Manual — § 5.4.5, “Brake Fading or Failure”

Question 6

The air-compressor governor normally reaches cut-out pressure at about:

  1. A 80 psi
  2. B 100 psi
  3. C 125 psi
  4. D 150 psi

Correct answer: C – 125 psi

Rhode Island's CDL manual gives approximately 125 psi as the normal air-compressor cut-out pressure and approximately 100 psi as the cut-in pressure. During the test, the gauge should stop rising when the governor cuts out. Because systems vary, the vehicle manufacturer's specifications determine the exact acceptable pressures.

Source: Rhode Island Commercial Driver License Manual — § 5.3, “Check Air Compressor Governor Cut-in and Cut-out Pressures”

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