100+ Free ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Practice Questions

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Question 1

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During PM, a tire with visible body ply or belt material (exposed cords/fabric) is:

Only a concern on the steer axle

An out-of-service tire defect that must be replaced

Acceptable if it holds air

Repairable with a plug

to track

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Key Facts: ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Exam

60 / 50

Total / Scored Questions

ASE Medium/Heavy Truck test series

75 min

Time Limit

ASE T8 test information

~$59

Registration Fee

ASE registration

44%

Frame & Chassis Weight

ASE T8 content area outline

4/32 in

Steer-Tire Tread Minimum

FMCSA 49 CFR Part 396 Appendix

Criterion

Scoring Method

ASE scoring policy

ASE lists T8 as a 60-question test with 50 scored multiple-choice items and a 75-minute time limit, delivered by Prometric. Scoring is criterion-referenced, so ASE sets the passing standard rather than a fixed national percentage. The official content weighting is Engine Systems 20%, Cab & Hood 10%, Electrical/Electronics 20%, Frame & Chassis 44%, and Road/Operational Test 6%, with inspection criteria grounded in FMCSA 49 CFR Part 396 periodic inspection minimum standards. This free practice bank provides 100 selected-response questions distributed across those same areas.

Sample ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Practice Questions

Try these sample questions to test your ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1During a PM inspection, an engine oil level reading taken five minutes after shutdown on a hot engine is BEST described as:

A.Always accurate because the engine is warm

B.Potentially false-high until oil drains back to the pan

C.Always false-low on a hot engine

D.Irrelevant if the low-oil lamp is off

Explanation: Oil clings to upper engine components right after shutdown, so the dipstick can read high until the oil drains back to the pan. Best practice is to wait several minutes (per OEM, often 5-15) on a hot engine before checking. A false reading leads to incorrect add/drain decisions.

2A serpentine belt shows multiple cracks across several ribs within a 1-inch span. The correct PM action is to:

A.Return to service; rib cracks are normal wear

B.Apply belt dressing and recheck in 90 days

C.Tighten the automatic tensioner further

D.Replace the belt

Explanation: Multiple cracks across the ribs within a short span indicate the belt has reached the end of its service life and can fail or slip. The belt should be replaced during the PM rather than returned to service. Belt dressing masks the condition and can accelerate failure.

3Tech A says a soft, spongy coolant hose that springs back slowly indicates internal deterioration. Tech B says oil-soaked rubber hoses should be replaced even if not currently leaking. Who is correct?

A.Both A and B

B.Tech B only

C.Tech A only

D.Neither A nor B

Explanation: A spongy hose that does not return to shape indicates internal breakdown and weakening. Oil-contaminated rubber swells and degrades, so an oil-soaked hose should be replaced even before it leaks. Both technicians are correct.

4During a charge-air cooler (CAC) inspection on a turbocharged diesel, the technician should primarily check for:

A.Coolant inside the CAC tubes

B.Cracks, leaks, and loose clamps at the CAC and connecting pipes

C.Excessive belt tension on the CAC pulley

D.Low refrigerant pressure

Explanation: A charge-air cooler carries pressurized boost air, so a PM check looks for cracks, oily streaks, and loose or deteriorated boot clamps that cause boost loss and poor performance/economy. CAC pipes are pressure connections, not coolant or refrigerant circuits.

5A small green/orange crusty deposit at a radiator hose connection during PM most likely indicates:

A.A slow external coolant seepage point

B.Normal road grime

C.Excessive coolant additive concentration

D.An exhaust leak

Explanation: Dried coolant leaves a colored crusty residue at the leak point even when no liquid is visible. This points to a slow external seepage that should be corrected before it worsens. Road grime is dark and uniform, not localized colored crust.

6The MOST appropriate PM method to verify engine coolant freeze/boil protection is to:

A.Look at the coolant color

B.Use a refractometer or properly calibrated hydrometer

C.Smell the coolant

D.Measure radiator cap diameter

Explanation: A refractometer (or calibrated coolant hydrometer) measures the glycol concentration that determines freeze and boil protection. Color is unreliable because dyes vary by brand and contamination. Protection level is a measured value, not a visual one.

7During PM, a clogged or heavily restricted air filter on a diesel engine will MOST directly cause:

A.Increased fuel economy

B.Higher oil pressure

C.Lower coolant temperature

D.High exhaust temperatures, low power, and possible black smoke

Explanation: A restricted air filter starves the engine of intake air, causing a rich condition with low power, elevated exhaust temperature, and black smoke under load. Air restriction is verified with the filter restriction gauge during PM. It does not improve economy.

8An air-filter restriction indicator that has latched at its maximum reading during PM means the technician should:

A.Service or replace the air filter, then reset the indicator

B.Reset it and ignore the reading

C.Replace the turbocharger

D.Add engine oil

Explanation: A restriction indicator latches at peak vacuum to record that the maximum allowable intake restriction was reached. The correct response is to service/replace the filter element and then reset the indicator. Resetting without service leaves the engine restricted.

9A wet, oily film on the lower engine and bell housing area during PM is BEST investigated by:

A.Assuming it is normal undercoating

B.Adding stop-leak additive

C.Cleaning the area, then running the engine to locate the active leak source

D.Replacing the oil pan immediately

Explanation: Oil migrates and tracks downward, so the visible film rarely marks the exact source. Cleaning then re-running the engine reveals the active leak (rear main, pan, cooler, etc.) so the correct component is repaired. Guessing at a part wastes time and money.

10During a diesel PM, fuel weeping at a steel injector supply line fitting should be:

A.Wiped off and returned to service

B.Corrected because high-pressure fuel leaks are a safety and fire hazard

C.Ignored if the engine still runs

D.Sealed with thread tape

Explanation: High-pressure diesel fuel leaks are a fire hazard and an out-of-service safety concern; they must be corrected, not wiped and released. Thread tape on high-pressure fuel fittings is not an acceptable repair. Continued operation risks a fuel fire.

About the ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Exam

ASE T8 is the Preventive Maintenance Inspection (PMI) test in the ASE Medium/Heavy Truck series. It certifies that a truck technician can perform a thorough, criteria-based PM inspection covering engine systems, cab and hood, electrical/electronics, frame and chassis (brakes, drivetrain, steering, tires/wheels, suspension, frame, and fifth wheel), and an on-road operational test, in line with FMCSA periodic inspection standards.

Assessment

50 scored multiple-choice (60 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items

Time Limit

75 minutes

Passing Score

Criterion-referenced (set by ASE)

Exam Fee

~$59 (ASE registration) (ASE (National Institute for Automotive Service Excellence))

ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Exam Content Outline

20%

Engine Systems

Fluid levels and leak inspection, belts and hoses, cooling system and coolant freeze/boil protection, charge-air cooler, air intake and filter restriction, exhaust and aftertreatment (DPF/DEF) leaks, and turbo/engine mounts.

10%

Cab & Hood

Cab and hood mounts, hinges and latches, windshield and glass condition, wipers and washers, required mirrors, seats and restraint systems, defroster/HVAC operation, and in-cab gauge and warning-lamp bulb checks.

20%

Electrical/Electronics

Battery, hold-down, cables and grounds, charging-system output, wiring harness condition, circuit protection, the complete DOT lamp and lighting inspection, trailer connections, warning lamps/telltales, and required safety devices.

44%

Frame & Chassis

Brake pushrod stroke and lining/drum/rotor measurement, air-system leakage and components, drivetrain leaks and U-joint/play checks, steering free-play and components, tire tread depth and condition, wheel fastener torque, suspension, frame cracks, and fifth-wheel inspection.

Road/Operational Test

On-road verification of braking balance and low-air behavior, steering control, transmission/clutch operation, gauges and warnings under load, leaks revealed by heat and load, and out-of-service determination and documentation.

How to Pass the ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Exam

What You Need to Know

Passing score: Criterion-referenced (set by ASE)
Assessment: 50 scored multiple-choice (60 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items
Time limit: 75 minutes
Exam fee: ~$59 (ASE registration)

Keys to Passing

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

ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Study Tips from Top Performers

1Spend most of your study time on Frame & Chassis: it is 44% of the test and brakes are the single largest sub-topic, so master pushrod stroke and lining/drum/rotor limits first.

2Memorize the measured criteria: 4/32-inch steer-tire and 2/32-inch other-tire tread minimums, allowable air-leakage rates, and pushrod stroke maximums by chamber size.

3Treat every item as a criteria-based PM decision: identify the defect, decide whether it is acceptable, repair-required, or out-of-service per FMCSA 396.

4Practice the full DOT lamp and air-brake test sequence so the electrical and brake checks become routine rather than memorized facts.

5Use the Tech A / Tech B questions to practice evaluating two statements independently before choosing, which mirrors how ASE writes these items.

Frequently Asked Questions

How many questions are on the ASE T8 PMI test?

ASE lists T8 as a 60-question test with 50 scored multiple-choice items; the other 10 are unscored research questions. This free practice bank provides 100 selected-response questions across the same content areas so you get broader coverage than a single official-length form.

How much time do I get and what does ASE T8 cost?

The ASE T8 test has a 75-minute time limit and a registration fee of about $59. Fees and windows can change, so confirm the current amount in your myASE account before you register or reschedule.

What is the passing score for ASE T8?

ASE scoring is criterion-referenced, meaning ASE sets the passing standard based on the knowledge required for competent work rather than a fixed national percentage or a curve. ASE reports your result as pass or not pass with diagnostic feedback by content area.

What content areas matter most on ASE T8?

The official weighting is Engine Systems 20%, Cab & Hood 10%, Electrical/Electronics 20%, Frame & Chassis 44%, and Road/Operational Test 6%. Frame & Chassis is by far the largest area, with brakes being the heaviest sub-topic, so prioritize pushrod stroke, lining/drum measurement, and air-system leakage.

What regulations should I know for ASE T8?

PM inspection criteria align with FMCSA 49 CFR Part 396 and its periodic inspection minimum standards. Know key out-of-service values such as 4/32-inch steer-tire tread, 2/32-inch other-tire tread, brake pushrod stroke limits by chamber size, and steering free-play limits.

What experience do I need to become ASE T8 certified?

ASE certification requires both passing the test and documented relevant work experience, generally two years (one year with a qualifying training-program substitution). Passing the test alone earns a test result; certification is granted once the experience requirement is also verified.

100+ Free ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) Practice Questions

ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck)

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