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Free Practice Questions for CT CDL Air Brakes

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Key Facts: CT CDL Air Brakes Exam

25 / 20

Questions on the Connecticut air brakes test, and correct answers needed to pass

CT DMV commercial learner's permit page

55 psi

Pressure before which a visible low air warning must come on

Connecticut CDL Manual Section 5.1.11

20-45 psi

Range in which spring brakes come fully on

Connecticut CDL Manual Section 5.1.14

3 / 4 psi

Maximum applied air loss in one minute for a single / combination vehicle

Connecticut CDL Manual Section 5.3.3

32 ft

Added air brake lag distance at 55 mph on dry pavement

Connecticut CDL Manual Section 5.4.4

4 parts

Air brake check you must explain and demonstrate on the vehicle inspection test

Connecticut CDL Manual Section 11.1.2

Prepare for the Connecticut CDL Air Brakes test with independent practice on Section 5 of the CT DMV manual. The test has 25 questions and needs 20 correct. Key facts from the Connecticut manual include a governor cut-out around 125 psi and cut-in around 100 psi, a low air warning before 55 psi, spring brakes at 20 to 45 psi, leakage limits of 2/3 psi (static) and 3/4 psi (applied) per minute, and about 32 feet of brake lag at 55 mph.

Sample CT CDL Air Brakes Practice Questions

Try these sample questions to review concepts for the CT CDL Air Brakes exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 216+ question experience with AI tutoring.

1According to the Connecticut DMV commercial learner's permit page, what is the format of the Air Brakes knowledge test?
A.20 questions, with 16 correct needed
B.25 questions, with 20 correct needed
C.30 questions, with 24 correct needed
D.50 questions, with 40 correct needed
Explanation: CT DMV says the air brakes endorsement test has 25 questions, and you need 20 correct to pass (80 percent). Most other endorsement tests have 20 questions with 16 correct needed.
2Under the restriction rules in Section 1 of the Connecticut CDL Manual, which situation puts the L restriction (no air brake equipped CMV) on a license?
A.Taking the skills test in a bus with an automatic transmission
B.Failing the general knowledge test on the first try
C.Testing in a vehicle that has both air brakes and ABS
D.Failing or skipping the air brake knowledge test
Explanation: Section 1 says that if an applicant does not take or fails the air brake component of the knowledge test, or performs the skills test in a vehicle not equipped with air brakes, the CLP or CDL must show the L restriction. Air brakes include any system operating fully or partly on the air brake principle.
3An applicant passes the air brakes knowledge test but takes the skills test in a vehicle with air-over-hydraulic brakes. Which restriction does the Connecticut CDL Manual say applies?
A.Z, no full air brake equipped CMV
B.L, no air brake equipped CMV
C.E, no manual transmission CMV
D.K, intrastate operation only
Explanation: Section 1 says that if an applicant performs the skills test in a vehicle with air-over-hydraulic brakes, the CDL must restrict the driver from CMVs equipped with any braking system operating fully on the air brake principle. Connecticut lists this as Z (no commercial vehicles with full air brake system).
4Section 1.1.1 of the Connecticut CDL Manual lists the air brakes knowledge test. When does it say you must take it?
A.Only if you will pull a trailer that has air brakes of its own
B.Only for a Class A license, never for B or C
C.If your vehicle has air brakes, including air over hydraulic
D.Only if you will carry hazardous materials
Explanation: The manual says the air brakes test is one you must take if your vehicle has air brakes, including air-over-hydraulic brakes. If you want to pull a trailer with air brakes, you also need to study Section 6, Combination Vehicles.
5You passed the written air brakes test, but the bus you bring to your Connecticut skills test has hydraulic brakes. According to Section 1.1.2 of the manual, what happens?
A.The examiner will reschedule the test at no cost
B.You keep full air brake privileges because you passed the written test
C.The test is cancelled until you get an air-brake bus
D.You will receive a CDL restricted to vehicles without air brakes
Explanation: The manual says that if you have taken and passed the written air brake test, the vehicle used for the skills test must be equipped with air brakes; otherwise you will receive a CDL restricted to vehicles without air brakes.
6According to Section 11.1.2 of the Connecticut CDL Manual, what happens if you fail to explain and demonstrate all four parts of the air brake check on the vehicle inspection test?
A.You lose points but can still pass
B.It is an automatic failure of the vehicle inspection test
C.The examiner completes the missing parts and scores you on the rest
D.You may retake only the missed part the same day
Explanation: Section 11.1.2 says that failing to explain and demonstrate all four parts of the air brake check correctly results in an automatic failure of the CDL vehicle inspection test. The parts are the air gauge and governor cutoff check, the air leakage rate test, the air warning device test, and the emergency brake test.
7During the emergency brake part of the Section 11 air brake check, your test vehicle's valves are not designed to pop out. What does the Connecticut CDL Manual say you must do?
A.Listen for air discharging, which shows the parking brakes applied
B.Skip that step entirely, because it does not apply to your type of vehicle
C.Pull the valve out by hand at 60 psi
D.Ask the examiner to choose a different vehicle
Explanation: If the valves are not designed to pop out, you need to listen for air discharging from the system, which indicates the parking (or emergency) brakes have been applied. If the vehicle has a backup air system, explain that it has one and that the valves will not pop out.
8Under CGS 14-275(c)(4), how must the air brake system be supplied on a new Connecticut school bus built since February 1, 1974?
A.From the same tank as the door and wiper controls
B.From a separate air reservoir used only for the brakes
C.From a vacuum booster rather than compressed air
D.From two compressors running at the same time
Explanation: CGS 14-275(c)(4) says each new school bus with a vehicle air brake system, from February 1, 1974, must have its brake system operated from a separate air reservoir tank, not the tank used for other compressed-air or vacuum-operated devices.
9Section 5 of the Connecticut CDL Manual says air brakes are really three different braking systems. Which three?
A.Service brake, parking brake, and emergency brake
B.Primary, secondary, and tertiary brakes
C.Front, rear, and trailer brakes
D.Foot brake, hand valve, and engine retarder
Explanation: The manual says air brakes are really three systems: the service brake (pedal during normal driving), the parking brake (parking brake control), and the emergency brake, which uses parts of the service and parking systems to stop the vehicle in a brake system failure.
10According to Section 5 of the Connecticut CDL Manual, what does the emergency brake system use to stop the vehicle in a brake system failure?
A.A separate set of drums on the front axle
B.An electric motor that clamps the driveshaft
C.The engine retarder and transmission only
D.Parts of the service and parking brake systems
Explanation: The manual says the emergency brake system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure. Spring brakes are the usual way this is done.

About the CT CDL Air Brakes Exam

The Connecticut CDL Air Brakes Knowledge Test is the CT DMV test for drivers of commercial vehicles with air brakes, including buses and trucks with air-over-hydraulic systems. It covers Section 5 of the Connecticut Commercial Driver's License Manual: air brake system parts, dual air systems, inspecting air brakes, and using air brakes. This free bank by OpenExamPrep offers independent practice on that material, the Section 11 air brake check, and Connecticut's L and Z restriction rules.

Exam sponsor: Connecticut Department of Motor Vehicles (CT DMV). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Connecticut applicants take the 25-question air brakes knowledge test on Section 5 of the Connecticut CDL Manual if their vehicle has air brakes, including air over hydraulic. Failing or skipping it, or taking the skills test in a vehicle without air brakes, brings the L restriction; a skills test in an air-over-hydraulic vehicle brings the Z restriction. The vehicle inspection test includes a four-part air brake check, and failing to explain and demonstrate all four parts is an automatic failure. This bank is an independent English-language multiple-choice study aid, not an official CT DMV test copy or simulation.

Time Limit

not-published

Passing Score

80% (20 of 25 correct)

Exam / Certification Fees

$5 air brakes test; $16 general knowledge test; $20 CLP; $30 skills test

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Manual Section 5.1

Air Brake System Parts

Compressor and governor, tanks and drains, safety valve, foundation brakes, gauges, low air warnings, limiting valves, spring brakes, parking controls, and ABS.

Manual Section 5.2

Dual Air Brake Systems

Primary and secondary systems, the 100 psi minimum before driving, warning thresholds, and single-system failures.

Manual Sections 5.3 and 11.1.2

Inspecting Air Brake Systems

Slack adjusters, drums and linings, governor checks, leakage tests, warning and spring brake tests, buildup rates, brake tests, and the four-part skills-test check.

Manual Section 5.4

Using Air Brakes

Normal and emergency stops, ABS, brake lag and stopping distance, fade, downgrade technique, low air response, and parking.

Manual Section 1; CT DMV; CGS 14-275

Connecticut Air Brake Licensing Rules

Test format, L and Z restrictions, testing in an air-brake vehicle, and the school bus brake reservoir rule.

Preparing for the CT CDL Air Brakes Exam

What You Need to Know

  • Passing score: 80% (20 of 25 correct)
  • Assessment: Connecticut applicants take the 25-question air brakes knowledge test on Section 5 of the Connecticut CDL Manual if their vehicle has air brakes, including air over hydraulic. Failing or skipping it, or taking the skills test in a vehicle without air brakes, brings the L restriction; a skills test in an air-over-hydraulic vehicle brings the Z restriction. The vehicle inspection test includes a four-part air brake check, and failing to explain and demonstrate all four parts is an automatic failure. This bank is an independent English-language multiple-choice study aid, not an official CT DMV test copy or simulation.
  • Time limit: not-published
  • Exam / certification fees: $5 air brakes test; $16 general knowledge test; $20 CLP; $30 skills test Official sources

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CT CDL Air Brakes: Suggested Study Strategy

1Read Section 5 of the Connecticut CDL Manual (R-295 Rev. 12/2024) and the air brake check in Section 11.1.2.
2Memorize the manual's pressures: cut-out around 125 psi, cut-in around 100 psi, safety valve at 150 psi, low air warning before 55 psi, spring brakes at 20 to 45 psi, and at least 100 psi in both dual systems before driving.
3Know the leakage limits: static loss under 2 psi per minute (single) or 3 psi (combination); applied loss no more than 3 psi (single) or 4 psi (combination).
4Practice explaining all four parts of the air brake check: governor cutoff, leakage rate, warning devices, and emergency brake pop-out.

Frequently Asked Questions

How many questions are on the Connecticut CDL Air Brakes test?

CT DMV lists the air brakes test at 25 questions. You need 20 correct answers (80 percent) to pass.

When do I need the air brakes test in Connecticut?

Section 1 of the Connecticut CDL Manual says you must take the air brakes test if your vehicle has air brakes, including air over hydraulic brakes. If you pass it, your skills test vehicle must have air brakes, or your CDL will be restricted to vehicles without air brakes.

What are the L and Z restrictions on a Connecticut CDL?

L (vehicles without air brakes) is added if you fail or do not take the air brake knowledge test, or take the skills test in a vehicle without air brakes. Z (no commercial vehicles with full air brake systems) is added if you take the skills test in a vehicle with air-over-hydraulic brakes.

What low air warning pressure does the Connecticut manual use?

Section 5 of the Connecticut CDL Manual says a visible low air warning must come on before tank pressure falls below 55 psi (or half the governor cut-out pressure on older vehicles). It also notes that large buses commonly signal at 80 to 85 psi.

Is this practice test an official CT DMV examination?

No. This is independent practice by OpenExamPrep, written in English multiple-choice format from the Connecticut CDL Manual and CT DMV pages. It is a study aid, not an official CT DMV test copy or simulation, and it does not replace the skills test.