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200+ Free Minnesota CDL Air Brakes Test Practice Questions

Pass your Minnesota Commercial Driver License (CDL) Air Brakes Knowledge Test exam on the first try — instant access, no signup required.

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In normal stops with air brakes, you should:

A
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D
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Key Facts: Minnesota CDL Air Brakes Test Exam

80%

Minimum CDL knowledge-test passing score

49 CFR 383.135

60 psi

CDL manual low-air warning check threshold

Minnesota CDL Manual Section 5 / 49 CFR 393.51

20-45 psi

Typical spring-brake automatic application range

Minnesota CDL Manual Section 5

150 psi

Typical air-brake safety valve setting

Minnesota CDL Manual Section 5

$26.75

Minnesota commercial learner permit fee

Minnesota DVS fee schedule

14 days

Minimum CLP holding period before completing CDL process

Minnesota DVS CLP page

Study Section 5 of the Minnesota commercial driver's manual and the FMCSA air-brake knowledge areas in 49 CFR 383.111(b). Know governor cut-in and cut-out, daily tank draining, low-air warning before about 60 psi, spring-brake application around 20-45 psi, buildup and leak-test limits, ABS behavior, brake lag, downgrade braking, parking controls, foundation-brake inspection, alcohol evaporators, and the legacy front-brake limiting valve. Minnesota DVS lists CLP qualifications, a 14-day CLP holding period, a $26.75 CLP fee, CDL license fees of $65/$57/$50, $2.50 endorsement examination fees, and $10 third-and-subsequent written retests.

Sample Minnesota CDL Air Brakes Test Practice Questions

Try these sample questions to test your Minnesota CDL Air Brakes Test exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1What part pumps compressed air into a vehicle's air storage tanks?
A.Air compressor
B.Brake chamber
C.Slack adjuster
D.Alcohol evaporator
Explanation: The air compressor supplies compressed air to the reservoirs. In CDL air-brake systems, the compressor is engine driven and the rest of the brake system depends on that stored air.
2What does the air compressor governor control?
A.When the compressor pumps air into the tanks
B.How thick the brake lining is
C.Whether ABS is turned on
D.The amount of fuel in the engine
Explanation: The governor controls compressor cut-in and cut-out. It allows pumping when pressure falls and stops pumping when the tanks reach the cut-out range.
3Why must air tanks be drained?
A.To remove water and compressor oil
B.To add brake fluid
C.To test tire tread depth
D.To make ABS cycle
Explanation: Compressed air can carry moisture and oil into the tanks. Draining removes contamination that can corrode parts or freeze in cold weather.
4When should manually drained air tanks normally be drained?
A.At the end of each day of driving
B.Only once a year
C.Only after the low-air warning comes on
D.Only before a road test
Explanation: The CDL manual tells drivers to drain manual air tanks at the end of each day of driving. Regular draining reduces water and oil contamination.
5What should a driver do if the low-air warning activates while driving?
A.Stop safely as soon as possible and have the problem fixed
B.Continue normally if the truck still moves
C.Fan the brakes to silence the warning
D.Pull the parking brake immediately at highway speed
Explanation: A low-air warning means air pressure has dropped into an unsafe range. The driver should stop safely before pressure falls far enough for spring brakes to apply.
6How are spring parking brakes held in the released position?
A.By air pressure compressing the spring
B.By brake fluid pressure
C.By ABS wheel sensors
D.By engine oil pressure
Explanation: Spring brakes are fail-safe: air pressure holds the powerful springs back. If air pressure is lost, the springs apply the brakes.
7Which control normally applies the parking brakes on a straight truck or bus with air brakes?
A.The yellow parking-brake knob
B.The red trailer-air-supply knob
C.The windshield wiper switch
D.The ABS malfunction lamp
Explanation: The yellow diamond-shaped parking-brake control applies and releases the vehicle parking brakes. Pulling it out applies the spring brakes.
8What is the main purpose of a dual air brake system?
A.To keep separate primary and secondary air circuits so one failure does not remove all braking
B.To make the truck use both diesel and gasoline
C.To remove the need for air gauges
D.To replace spring brakes with hydraulic brakes
Explanation: A dual system uses separate primary and secondary circuits with their own air supply. If one circuit has trouble, the other can still provide some braking.
9What is the purpose of ABS on an air-brake vehicle?
A.To help prevent wheel lockup during hard braking
B.To shorten every stop on every surface
C.To replace the service brakes
D.To build air pressure faster
Explanation: ABS monitors wheel speed and modulates brake pressure to help wheels keep rotating. This helps the driver maintain steering control during hard braking.
10What is brake lag?
A.The delay between pressing the pedal and the brakes applying fully
B.A low-fuel warning
C.The time it takes to drain air tanks
D.A method for adjusting slack adjusters
Explanation: Air takes time to travel through lines and apply brake chambers, so air brakes have brake lag. Drivers must account for this added delay in stopping distance.

About the Minnesota CDL Air Brakes Test Exam

The Minnesota CDL Air Brakes Knowledge Test covers Section 5 of the Minnesota commercial driver's manual for drivers who operate trucks, buses, or other commercial motor vehicles equipped with air brakes. The test focuses on air compressor and governor operation, storage tanks and draining, low-air warnings, air pressure buildup and leak tests, spring and parking brakes, dual air systems, ABS, brake lag, emergency braking, slack adjusters, foundation brakes, inspection procedures, alcohol evaporators, cold-weather moisture control, and older front brake limiting valves. DVS administers Minnesota CDL written testing under FMCSA CDL standards.

Assessment

Multiple-choice CDL written knowledge exam covering air-brake systems and Minnesota commercial driver's manual Section 5 air-brake knowledge. Federal rules require applicants who fail the air-brake knowledge portion to receive an air-brake restriction if issued a CLP or CDL, and removing air-brake restrictions requires the air-brake knowledge test plus the required air-brake pre-trip or skills-test condition.

Time Limit

Set by Minnesota DVS testing administration; no separate public Air Brakes time limit found in official sources

Passing Score

80% minimum

Exam Fee

Commercial learner permit $26.75; Class A $65, Class B $57, Class C $50; endorsement examination fee $2.50; third and subsequent written retests after failing the first two are $10 (Minnesota Driver and Vehicle Services (DVS))

Minnesota CDL Air Brakes Test Exam Content Outline

49 CFR 383.111(b)

Air Brake System Parts

Compressor, governor, tanks, drains, alcohol evaporator, safety valve, brake pedal, foundation brakes, slack adjusters, air gauges, low-air warning, spring brakes, parking controls, and ABS.

Core Section 5 domain

Dual Air Brake Systems

Primary and secondary systems, pressure gauges, redundancy, spring brakes, parking controls, one-way check valves, and safe response when one circuit loses pressure.

49 CFR 383.111(b)(5)-(6)

Inspecting Air Brakes

Governor cut-out and cut-in, air buildup rate, static and applied leak checks, low-air warning, spring-brake pop-out, parking-brake and service-brake tests, and wheel-end inspection.

49 CFR 383.111(b)(7)

Using Air Brakes

Brake lag, normal stops, controlled braking, stab braking, ABS stops, brake fade, long downgrades, emergency braking, parking, and cold-weather moisture control.

How to Pass the Minnesota CDL Air Brakes Test Exam

What You Need to Know

  • Passing score: 80% minimum
  • Assessment: Multiple-choice CDL written knowledge exam covering air-brake systems and Minnesota commercial driver's manual Section 5 air-brake knowledge. Federal rules require applicants who fail the air-brake knowledge portion to receive an air-brake restriction if issued a CLP or CDL, and removing air-brake restrictions requires the air-brake knowledge test plus the required air-brake pre-trip or skills-test condition.
  • Time limit: Set by Minnesota DVS testing administration; no separate public Air Brakes time limit found in official sources
  • Exam fee: Commercial learner permit $26.75; Class A $65, Class B $57, Class C $50; endorsement examination fee $2.50; third and subsequent written retests after failing the first two are $10

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Minnesota CDL Air Brakes Test Study Tips from Top Performers

1Memorize the key air-brake numbers: governor cut-in/cut-out, 60 psi low-air warning, 20-45 psi spring-brake application, 150 psi safety valve, 85-to-100 psi buildup, and leak-rate limits.
2Practice explaining each in-cab air-brake inspection step out loud in the order used by the Minnesota commercial driver's manual.
3Keep air-brake knowledge separate from combination-only detail unless the question involves trailer air supply or combination leak-test limits.
4Understand spring brakes conceptually: air holds them released, and loss of air lets the springs apply.
5Review ABS and emergency braking carefully; ABS helps maintain control but does not cancel speed, following distance, or surface-condition limits.
6Pay special attention to cold-weather moisture control because Minnesota winter conditions make tank draining, air dryers, and alcohol evaporators practically important.

Frequently Asked Questions

Who administers the Minnesota CDL Air Brakes test?

Minnesota Driver and Vehicle Services administers CDL written knowledge testing through DVS exam stations and approved testing locations, using the Minnesota commercial driver's manual as the study source.

What score do I need to pass?

FMCSA rules require at least 80% correct on each CDL knowledge test, including the air-brake knowledge portion.

Is air brakes an endorsement in Minnesota?

Air brakes are handled as a CDL restriction issue, not a standard endorsement like passenger, school bus, tank, doubles/triples, or hazmat. Minnesota lists L as not valid for CMVs with air brakes and Z as air-over-hydraulic brake system only.

How much does the Minnesota CDL process cost?

DVS lists a $26.75 commercial learner permit fee, CDL license fees of $65 for Class A, $57 for Class B, and $50 for Class C, a $2.50 endorsement examination fee, and a $10 third-and-subsequent written retest fee after failing the first two.

Does passing the Air Brakes knowledge test remove the L restriction by itself?

Passing the knowledge test is necessary, but federal rules also require the proper air-brake pre-trip inspection and required skills-test condition when removing or avoiding an air-brake restriction.

What should I study for the Minnesota CDL Air Brakes test?

Study Section 5, Air Brakes, in the Minnesota commercial driver's manual. If you will operate a combination vehicle with air brakes, review combination-vehicle air-brake material as context without replacing Section 5.