Massachusetts CDL Air Brakes Practice Test (MA) 2

5 out of 5 (82 votes)
80% Passing score
20 Questions
4 Mistakes allowed
If you're preparing for your commercial driver's license in Massachusetts, our MA CDL air brake practice test is an essential tool to ensure you're fully ready for the real deal. This comprehensive Mass RMV practice test is designed to closely mirror the actual RMV permit test experience, featuring 20 multiple-choice questions that cover all critical aspects of air brake systems. From understanding the components and operation to mastering safety inspections and stopping distance calculations, this test offers a thorough review of everything you need to know. Drawing directly from the official MA driver's manual, this learner's permit practice test ensures that you're studying the same material that will appear on your actual test. While the DMV doesn't allow the publication of real permit test questions and answers, our Massachusetts RMV air brake test simulates the test environment closely, using comparable phrasing and identical topics. This authentic practice experience helps you get comfortable with the test format and types of questions you'll face. To pass this air brakes CDL test, you'll need to correctly answer at least 16 of the 20 questions. The test covers essential facts, such as the use of dual air brake systems, which provide an extra layer of safety by serving as a backup if one system fails. This MA CDL air brake practice test is perfect for those who want to cover all necessary topics in one session, ensuring a well-rounded preparation. While preparing for your test, it's beneficial to supplement your Massachusetts permit practice test with additional study materials. Consider revisiting the state-certified driver's handbook, engaging in a drivers ed course, or using flashcards and road sign charts. This comprehensive approach targets all areas of the RMV permit test, providing a well-rounded preparation. Driving in MA comes with its own set of unique challenges. From navigating the bustling streets of Boston to dealing with the notorious New England weather, being well-prepared is crucial. This Massachusetts CDL air brake practice test not only prepares you for the test but also helps you become a safer, more knowledgeable driver on the roads of the Bay State.
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Sample Massachusetts Air Brakes Test Questions

Question 1

What force applies spring-type parking and emergency brakes when the air holding them back is released?

  1. A Compressed-air pressure
  2. B Mechanical spring pressure
  3. C Hydraulic-fluid pressure
  4. D Electrical current

Correct answer: B – Mechanical spring pressure

Spring brakes are applied by mechanical spring force. During normal operation, air pressure holds the springs back; releasing or losing that air allows the springs to apply the brakes. The Massachusetts CDL manual explains that this design allows parking and emergency brakes to remain applied without depending on an air supply that could leak away.

Source: Massachusetts CDL Manual – March 2025 Version — § 5.1.14, “Spring Brakes”

Question 2

With the service brakes fully applied, a combination vehicle may lose up to 4 psi in one minute without exceeding the air-leakage limit.

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

During the applied air-leakage test, fully apply and hold the foot brake for one minute. The maximum acceptable loss is 3 psi for a single vehicle or 4 psi for a combination vehicle. A combination vehicle that loses more than 4 psi in one minute has excessive leakage that must be corrected before it is driven.

Source: Massachusetts CDL Manual – March 2025 Version — § 5.3.3, “Step 7: Final Air Brake Check”

Question 3

What activates the electrical switch that turns on the brake lights in an air-brake system?

  1. A A hand-operated control
  2. B Air pressure
  3. C Hydraulic pressure
  4. D Spring pressure

Correct answer: B – Air pressure

An air-brake system uses an electrical stop-light switch operated by air pressure. When the driver applies the air brakes, pressure activates the switch and turns on the brake lights. This warns following drivers that the commercial vehicle is slowing or stopping.

Source: Massachusetts CDL Manual – March 2025 Version — § 5.1.12, “Stop Light Switch”

Question 4

Which instrument must an air-braked commercial vehicle have?

  1. A An application-pressure gauge on every brake chamber
  2. B A gauge showing the air pressure available for braking
  3. C A complete hydraulic backup-brake system
  4. D At least three air-storage tanks

Correct answer: B – A gauge showing the air pressure available for braking

Federal motor-carrier equipment rules require an air-braked commercial vehicle to have a pressure gauge and warning signal. The gauge displays the pressure available for braking. As described in the Massachusetts CDL manual, a dual system uses a gauge for each half or one gauge with two needles.

Source: Massachusetts CDL Manual – March 2025 Version — § 5.1.9, “Supply Pressure Gauges”, 49 CFR § 393.51(c) – Warning Signals, Air Pressure and Vacuum Gauges

Question 5

At approximately what pressure does the governor normally stop the air compressor from pumping?

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

Correct answer: C – 125 psi

The governor normally reaches compressor cut-out at approximately 125 psi. When tank pressure falls to about 100 psi, the governor reaches cut-in and allows the compressor to pump again. These are typical values, and the vehicle manufacturer’s specifications should be checked for the actual operating range.

Source: Massachusetts CDL Manual – March 2025 Version — § 5.1.2, “Air Compressor Governor”

Question 6

Which procedure should you use to control speed on a long, steep downgrade?

  1. A Wait until reaching 5 mph above the safe speed, then brake back to the safe speed
  2. B Use only the trailer brakes to control the combination
  3. C Maintain continuous light pressure on the service brakes
  4. D Use engine braking, then brake at the safe speed until about 5 mph below it and release

Correct answer: D – Use engine braking, then brake at the safe speed until about 5 mph below it and release

Select the proper low gear and use engine braking as the principal method of controlling speed. When the vehicle reaches its safe speed, apply the brakes firmly enough to produce a definite slowdown. Release them after slowing to approximately 5 mph below the safe speed, then repeat the procedure as necessary.

Source: Massachusetts CDL Manual – March 2025 Version — § 5.4.6, “Proper Braking Technique”

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