The ASE T8 Preventive Maintenance Inspection (PMI) test has 50 scored questions in five content areas, plus 10 unscored questions, and you get 75 minutes for all 60. Frame and chassis is by far the biggest area at 22 questions (44.0%), and its task list spans brakes, drivetrain, steering, tires and wheels, and suspension, frame and fifth wheel. Engine systems and electrical/electronics have 10 questions each (20.0%), cab and hood has 5 (10.0%), and the road/operational test has 3 (6.0%). The 169 tasks are inspection work across the whole truck: what to check, how to check and record it, and when a finding calls for action. Questions are four-option multiple choice, including Technician A / Technician B, cause, procedure and EXCEPT items. T8 is one of the seven tests, T2 to T8, that ASE requires for Master Medium/Heavy Truck Technician. A pass plus 2 years of documented work experience certifies you for 5 years.
01The test specification
The ASE test specification for ASE T8 Preventive Maintenance Inspection (PMI) splits the 50 scored questions across five content areas. ASE adds 10 unscored questions for research, and you have 75 minutes for all of them. Each area links to five free questions.
| Area | Content area | Scored questions |
|---|---|---|
| A | Engine Systems | 10 (20%) |
| B | Cab and Hood | 5 (10%) |
| C | Electrical/Electronics | 10 (20%) |
| D | Frame and Chassis | 22 (44%) |
| E | Road/Operational Test | 3 (6%) |
| Total | 50 |
02What is the ASE T8 Preventive Maintenance Inspection test?
T8 is ASE's Preventive Maintenance Inspection (PMI) test, part of its Medium/Heavy Truck series. The other tests in the series are each named for one system, such as T4 Brakes or T6 Electrical/Electronic Systems. T8 covers the whole truck at inspection level. Its task list reads like a PM checklist: check, inspect, measure, record, lubricate, and decide what action a finding needs. It runs from the engine compartment and the cab through the electrical system, brakes, drivetrain, steering, tires, suspension, frame and fifth wheel, and ends with a road test. Several tasks cover tractor and trailer equipment, such as the tractor protection valve, gladhands, the trailer power cord and the fifth wheel.
The test has 50 scored questions and 10 unscored ones, 60 in all, and you get 75 minutes. Every question is multiple choice with four options, (A) to (D). ASE uses the unscored questions to gather statistics for future tests, and you cannot tell which ones they are, so answer every question.
Passing is one half of certification. ASE also asks you to document relevant work experience, which for the Medium/Heavy Truck tests is 2 years, and its study guide says suitable vocational training can count toward it; the details are at workexp.ase.com. The study guide does not publish a passing score. Once certified, you hold the certification for 5 years, and you renew it with a shorter recertification test, which for T8 is 25 questions in 30 minutes.
ASE marks seven tests in the series, T2 to T8, as required for recognition as an ASE Certified Master Medium/Heavy Truck Technician. T1 Gasoline Engines is in the same study guide but is not one of the required tests.
03What does each content area cover?
The task list has 169 tasks. Most of them follow one pattern: look at a part or system, measure or test it where that applies, record what you find, and decide whether it needs action. A few tasks appear in more than one area, such as the safety and records checks at the start of areas A and B.
Area A: Engine Systems (10 questions)
Twenty-nine tasks. You start by identifying how the truck is powered (gasoline, diesel, alternative fuel or high-voltage electric) and working to the maker's safety procedures with the right protective gear. You review earlier repair records, the driver's condition reports, service bulletins and recalls, and pull active and inactive codes, trip data and telematics. With the engine running you listen for noises and vibration, watch for smoke, and write down idle speed, oil pressure and PTO speed. You inspect the vibration damper, belts and pulleys, engine mounts, oil level, engine wiring, and leaks of oil, coolant, air, DEF and fuel with the engine off and running. Fuel tasks cover tanks and anti-siphon devices, the water separator, filter changes, and priming and bleeding. Air and exhaust tasks cover crankcase ventilation, exhaust and aftertreatment parts (DPF, DOC, SCR) for leaks, routing and tampering, the intake side with its restriction indicator and charge air cooler, turbochargers with wastegate or VGT, air filters, EGR and its cooler, and the clean air decal. Cooling tasks cover the fan clutch and shroud, radiator, pressure testing the system and cap, hoses, the surge tank, coolant type, pH, SCA level and freeze point, draining and refilling, and the water pump. The area ends with an oil and filter change, looking at the drained oil for coolant or fuel, cleaning magnetic plugs and taking an oil sample.
Area B: Cab and Hood (5 questions)
Thirty-two tasks, the most per question of any area. Inside the cab you check the key, switch and locks, warning lights (ABS, traction control and ADAS among them), gauges, PTO and idle controls, HVAC controls, switches, accessories and horns. You repeat the records and codes review, this time from the electronic modules. Safety items include flares, spare fuses, reflective triangles, the fire extinguisher and required decals, seat belts, seat tethers and sleeper restraints, and the SRS warning light and codes. Paperwork counts too: permits, registration and inspection papers, and a securely mounted, connected ELD. You inspect the windshield, wipers and washers, seats, windows, steps, grab handles and mirrors, and record any physical damage. Body tasks cover lubricating hinges, latches and grease fittings, cab mounts, tilt cab hydraulics and safety devices, the pedals, cab air suspension and ride height, and the bumper, fenders and fairings. The area closes with the A/C condenser, compressor and lines (service port caps included), HVAC condition and filters, and the auxiliary power unit.
Area C: Electrical/Electronics (10 questions)
Fifteen tasks. You identify any high-voltage battery, cable or component and follow the maker's safety procedures and protective gear rules. On the 12-volt side you inspect battery boxes, covers, hold-downs, cables and routing, record open circuit voltage, identify the battery type (lead-acid, AGM and others) and run load and capacitance tests. You inspect the starter and its cables, crank the engine to listen for noise and drag, inspect the alternator and its wiring, and run charging tests such as voltage, current output and diode checks. The rest covers interior and exterior lights with headlight aim, the trailer power cord, camera and radar mounting, and fuse blocks and power distribution modules.
Area D: Frame and Chassis (22 questions)
Eighty-two tasks, nearly half the list, in four groups. ASE prints the 22 questions for the area as a whole and does not split them by group.
Brakes (29 tasks) starts with air brakes: parking brake operation, recording governor cut-in and cut-out pressures, the air dryer with its purge valve and heater, leak checks on the service and parking systems, draining tanks and testing one-way and double check valves, low air warnings, the spring brake or emergency control valve, the tractor protection valve, build-up time, the trailer hand valve, and ABS and traction control self-tests. Then air lines and gladhands, chambers, recording lining and pad thickness, drums and rotors, automatic slack adjusters, S-cams, air disc calipers, and lubrication. The hydraulic tasks cover the master cylinder, lines and hoses, the parking brake, pedal feel, calipers and wheel cylinders, boosters, drum adjustment and the backup assist system.
Drivetrain (19 tasks) covers the release bearing and clutch brake, clutch linkage and air-actuated clutches, clutch hydraulics and adjustment, then the transmission and transfer case: housings, seals, coolers and lines, wiring, breather, mounts and fluid. You inspect U-joints, yokes, driveshafts, center bearings and phasing, axle housings and breathers, check and change axle oil, check the PTO, change transmission fluid, and take oil samples from the transmission and drive axles.
Steering, tires and wheels (18 tasks) covers steering wheel free play and gear lash, the power steering pump, hoses, fluid and filter, the gear or rack, steering shafts and linkage down to the wheel stops, kingpins and thrust bearings, wheel bearings and hubs (unitized and other extended service types included), hub oil in non-drive axles, and end play. Tire and wheel tasks cover wear patterns, mismatched duals, sidewall damage, valve stems, TPMS, recording tread depth and pressure, loose lugs, slipped wheels, retorquing, and cracked wheels.
Suspension, frame and fifth wheel (16 tasks) covers spring suspension parts and U-bolt torque, shocks, air suspension and ride height, tag and pusher axles, and tandem axle spacing. The fifth wheel tasks cover mounts, sliders, locks and stops, testing and adjusting the locking device (air and manual), and cleaning, inspecting and lubricating the plate. The rest covers the pintle hook, mud flaps and reflectors, frame members and huck bolts, body mounting hardware, cargo ramps and lift gates, the rear impact guard and air deflectors, and automatic tire chains.
Area E: Road/Operational Test (3 questions)
Eleven tasks done on the road: the clutch and shifting, automatic or automated manual transmissions, instruments, gauges and lights, steering play and centering, the road speed limiter, cruise control, exhaust leaks, noise and smoke, parking and service brakes, the engine brake, exhaust brake or retarder, backup cameras and alarms, and ADAS operation and codes.
04What kind of questions are on it?
ASE's study guide has eight sample questions for T8, and they mix four styles.
Rules and limits. One sample asks for the smallest steer tire tread depth that federal DOT standards allow. Inspection tasks such as recording tread depth or air pressure warnings come with numbers, so learn the limits behind them, not only the procedure.
Cause of a finding. Two samples give you something seen during an inspection or reported by a driver and ask what could cause it: a fan that strikes its shroud when the truck pulls hard, and drive axle oil that looks milky. A third shows an illustration with a labeled part that is swollen and asks what that could lead to. Practice linking what you find on a PM to the fault behind it.
Procedure. Two samples ask how to do a check correctly: how much pressure to use when pressure testing a cooling system, and how to set up a load test on a truck with more than one battery. The right answer is the correct way to run the test, so know why each step matters.
Technician A / Technician B. One sample gives two statements about air brake pressures, the low air warning and when the parking brakes apply on their own, and asks who is right. See how to answer Technician A / B questions.
Reading traps
One sample is an EXCEPT question about a dash gauge for air intake restriction, flagged by a line telling you to read carefully. Three options could cause the reading and you pick the one that could not. Read EXCEPT questions twice before you answer.
05Where should your study time go?
Area D is 22 of the 50 scored questions (44.0%), more than any two other areas combined. Engine systems and electrical/electronics add 10 each, so A, C and D together are 42 of 50 (84.0%). Cab and hood (5) and the road test (3) make up the other 8 (16.0%).
Start with area D, and within it, brakes: with 29 of the area's 82 tasks it is the longest group, though ASE does not say how many questions it carries. Air brake checks with a recorded number (governor settings, build-up time, low air warnings, lining thickness) are worth learning cold. Area C has only 15 tasks for 10 questions, so know every task on that short list well. Area B is the reverse, 32 tasks for 5 questions: cover it for breadth. Many road test tasks repeat checks from other areas (gauges, steering play, brakes, smoke), so studying those areas also prepares you for area E.
Use the task list as a checklist and mark each task you could explain. For each one, know what you are checking, how you measure or record it, and what result calls for action. ASE says every question represents one or more tasks, though not every task appears on every version of the test. Pace: 60 questions in 75 minutes is 1 minute 15 seconds each.
06Registering, retesting and recertifying
You register and pay through ase.com. ASE charges a $34 registration fee per order plus $62 for each test, so T8 on its own comes to $96. Each extra test in the same order adds $62. ASE sets the fees and registration dates, so check ase.com before you book. The full breakdown is in ASE test fees and registration.
The test is delivered on screen. ASE offers a free demo of its testing platform at ase.com/free-test-drive, and the study guide notes that every ASE test has a pop-up English to Spanish glossary for native Spanish speakers. More on the format: how ASE tests work.
If you do not pass, ASE makes you wait 30 days before you can take the test again. Use the month on frame and chassis first, since it carries 22 of the 50 scored questions.
After you pass, the certification runs for 5 years. To renew it you take the T8 recertification test, 25 questions in 30 minutes; you are eligible for it only after passing the full certification test once.
07Questions people ask
- How many questions are on the ASE T8 test?
- 60 questions in 75 minutes: 50 scored and 10 unscored. The 50 scored questions are spread over five content areas, from 22 on frame and chassis to 3 on the road/operational test. You cannot tell which 10 are unscored, so answer all 60. That is 1 minute 15 seconds per question.
- What is the biggest content area on ASE T8?
- Frame and Chassis, with 22 of the 50 scored questions (44.0%). It covers brakes, drivetrain, steering, tires and wheels, and suspension, frame and fifth wheel, and ASE does not split the 22 questions between those groups. Engine systems and electrical/electronics have 10 each, cab and hood 5, and the road/operational test 3.
- Does ASE T8 count toward Master Medium/Heavy Truck Technician?
- Yes. ASE requires seven tests, T2 to T8, for recognition as an ASE Certified Master Medium/Heavy Truck Technician. T1 Gasoline Engines is in the same series but is not required. Each certification also needs 2 years of documented work experience.
- How long is the ASE T8 recertification test?
- The T8 recertification test has 25 questions in 30 minutes, against 60 questions in 75 minutes for the certification test. You can take it only after passing the full T8 certification test once, and it renews a certification that lasts 5 years.
- How much does the ASE T8 test cost?
- ASE charges $62 per test plus a $34 registration fee per order, so T8 on its own is $96. A second test in the same order adds $62. Check ase.com before you book, since fees can change.
- Is ToolboxPrep affiliated with ASE?
- ToolboxPrep is an independent study site, not affiliated with or endorsed by ASE (the National Institute for Automotive Service Excellence). Our questions are original, written from ASE’s published test specifications and task lists and other public sources. They are not actual ASE test questions and not recalled or “brain dump” questions. ASE is a trademark of its owner, and we never use the ASE logo. Standards and service information are cited, not reproduced.
08Sources
- ASE Medium/Heavy Truck Tests study guide, 2026: the T8 test specification, question counts, testing time, the recertification length, the 2-year work experience requirement, the Master Medium/Heavy Truck test list, the task list this page paraphrases and the sample-question formats
- ASE (ase.com): the $34 registration fee per order, the $62 fee per test, the 5-year certification period and the 30-day retest wait
The content areas and question counts were checked against ASE's published study guide on October 17, 2026, and the task descriptions paraphrase its task list. ASE's study guide is the final word. If you find one of ours out of date, tell us.
Related: free practice questions · ten free T8 questions · How ASE tests work · ASE test fees and registration
09Practice for this test
ToolboxPrep T8 practice tests are weighted to the specification above, area by area, and every answer is explained, all four options. You can try five sample questions with no account.
Ten free questions per test, no account: free practice questions. How our questions are written and checked: how our questions are made.
ToolboxPrep is an independent study site, not affiliated with or endorsed by ASE (the National Institute for Automotive Service Excellence). Our questions are original, written from ASE’s published test specifications and task lists and other public sources. They are not actual ASE test questions and not recalled or “brain dump” questions. ASE is a trademark of its owner, and we never use the ASE logo. Standards and service information are cited, not reproduced.