Ten ASE T8 Preventive Maintenance Inspection (PMI) questions in the ASE format: four options, one best answer. They are free to use, print and share, and there is nothing to sign up for on this page.
01How to use these
The questions come from the ToolboxPrep T8 bank and are spread across the test's content areas in the proportion the ASE test specification gives them: A (Engine Systems), B (Cab and Hood), C (Electrical/Electronics), D (Frame and Chassis), E (Road/Operational Test). Answer each one before opening the explanation. Every explanation covers all four options, because knowing why the wrong answers are wrong is most of the skill.
- Pace. The T8 test gives you 75 minutes for 60 questions (50 scored, 10 unscored), about 1 min 15 s a question. Try these at that pace.
- Print. The printed version shows the questions and the answer key without the explanations, so it works as a handout.
02The questions
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During a PMI with the engine running, coolant drips steadily from the small weep hole in the coolant pump housing below the pulley shaft. The pulley shows no play when rocked by hand with the engine off. Which of these is the cause?
- A worn coolant pump shaft bearing
- A leaking coolant pump shaft seal
- A leaking pump-to-block gasket
- A pressure cap that opens too early
Show the answer
B. Correct. The weep hole sits between the pump's shaft seal and its bearing, so coolant that gets past a failing seal drains out instead of washing into the bearing. A steady drip from it means the seal is leaking, and the pump is written up before the coolant ruins the bearing.
Why not the others
A. A worn bearing shows as play or roughness at the pulley, and this pulley has none. The drip from the weep hole comes from coolant getting past the shaft seal.
C. A mounting gasket leak shows at the joint between the pump and the block or cover, not from the weep hole under the shaft. Coolant from the weep hole has passed the shaft seal.
D. A cap that opens early lets coolant out to the overflow or recovery side, not out of the pump's weep hole. The drip from the weep hole points at the pump's shaft seal.
ID T8-A-002 · Task T8-A-27 (ASE task list)
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A truck's air cleaner has a latching (lockout) restriction indicator. At a PMI with the engine stopped, its window shows red. What does that mean?
- The element has torn and is passing dirt
- The element is restricted now, with the engine stopped
- The restriction reached its limit since the last reset
- The indicator failed, since it should drop back at shutdown
Show the answer
C. Correct. A latching indicator locks in the red position once intake restriction reaches its set point with the engine running, and it stays there after shutdown until it is reset by hand. Red at a PMI means the set point was reached since the last reset; the element is serviced and the indicator reset.
Why not the others
A. A torn element passes air more easily and lowers restriction, so it would not trip the indicator. Red on a latching indicator records high restriction since the last reset.
B. With the engine stopped no air flows, so there is no restriction for the indicator to read at that moment. A latched red window records restriction that reached the set point while the engine ran.
D. A latching indicator is built to stay red after shutdown so the reading can be seen at service, and it is reset by hand. Red does not mean the indicator has failed.
ID T8-A-021 · Task T8-A-15 (ASE task list)
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At a PMI, a tractor's aluminum A/C condenser, mounted ahead of the radiator, shows white, powdery corrosion where its fins meet the tubes, and fins crumble when brushed by hand. There is no oily film anywhere on the core or its fittings. What does this finding mean for the condenser?
- Poorer heat transfer, and leaks can follow
- Refrigerant already escaping through the tubes
- Surface wear only, with the core still sound
- Moisture getting inside the refrigerant circuit
Show the answer
A. Correct. Road salt and water attack the aluminum where the fins are bonded to the tubes; once the fins loosen and crumble, heat no longer passes well from the tubes to the air, so the condenser sheds less heat and high-side pressure runs higher, and corrosion that reaches the thin tube walls can go on to perforate them. The finding is recorded and the condenser is scheduled for replacement.
Why not the others
B. Escaping refrigerant carries compressor oil out with it and leaves an oily, dusty film, and none is found here. The dry white powder is corrosion of the aluminum fins and tubes, which cuts heat transfer now and can lead to leaks later.
C. Fins that crumble are no longer bonded to the tubes, so the core cannot pass heat to the air as it should; the damage is more than cosmetic. It is recorded, because heat transfer is already reduced and the corrosion can go on to cause leaks.
D. The corrosion is on the outside of the core, from salt and water thrown up by the road; it says nothing about moisture inside the sealed refrigerant circuit. What it does mean is poorer heat transfer now, with leaks possible as it spreads.
ID T8-B-001 · Task T8-B-28 (ASE task list)
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Before working near a hybrid truck's high-voltage components, a technician traps air in each rubber insulating glove by rolling its cuff closed, then squeezes it while listening and feeling along the fingers and palm. What is this test looking for?
- Whether the leather protector fits over it
- Whether its voltage class suits the system
- Whether it is past its electrical retest date
- Holes or cuts that would let current through
Show the answer
D. Correct. Trapped air escapes through a pinhole, cut or tear the eye can miss, and any such opening would let current reach the hand. Rubber insulating gloves get this air test along with a visual inspection before each day's use, and a glove that leaks is taken out of service.
Why not the others
A. Leather protectors are worn over rubber gloves to guard them from cuts, but their fit is not what the air test checks. Trapped air shows whether the rubber itself has a hole or tear.
B. The glove's voltage class is read from its label and matched to the system before use; squeezing trapped air cannot show it. The air test finds holes, cuts or tears that would let current through.
C. The last electrical test date is stamped or recorded on the glove and is checked by reading it. The air test is a hands-on check for holes, cuts or tears.
ID T8-C-005 · Task T8-C-2 (ASE task list)
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At a PMI, the rubber boot is missing from a truck alternator's output terminal. Why is it replaced even though the alternator charges normally?
- It stops the terminal nut from loosening
- It keeps engine heat away from the regulator
- It filters electrical noise out of the output
- Its terminal stays live with the engine off
Show the answer
D. Correct. The output terminal is wired straight to the batteries, so it is live at all times; a dropped wrench or a loose bracket touching it and the engine would short the batteries through heavy current. The boot is replaced, and the batteries are disconnected before anyone works on that terminal.
Why not the others
A. The nut is held by being tightened to its torque, not by the boot. The boot is there because the terminal is always connected to the batteries and must not be shorted to ground.
B. The boot does not shield the regulator from heat. It covers a terminal that is connected to the batteries at all times, so nothing metal can short it to ground.
C. Electrical noise is handled by the rectifier and suppression parts, not by a rubber boot. The boot insulates a terminal that is live from the batteries even with the engine off.
ID T8-C-022 · Task T8-C-9 (ASE task list)
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During a PMI on a straight truck with spring parking brakes, the technician sets the parking brakes and gently tries to pull against them in a low gear. What should the service brake pedal be doing during this check?
- Held lightly applied, so the truck does not lurch
- Held fully applied, to test anti-compounding too
- Left fully released, so only the springs hold
- Pumped until the air drops below governor cut-in
Show the answer
C. Correct. The check is meant to prove that the spring brakes alone can hold the truck against light engine torque, so no service air may help them. If the truck moves, the spring brakes and their foundation brakes are inspected before it returns to service.
Why not the others
A. Any service application adds service brake force to the springs' force, so a weak spring brake could pass unnoticed. The pedal stays released so the springs alone hold the truck.
B. A full service application lets the service brakes hold the truck, which proves nothing about the springs. Anti-compounding is checked as a separate test; this check is made with the pedal released.
D. Reservoir pressure has no part in the holding force once the spring chambers are exhausted, because the springs apply the brakes mechanically. Pumping the pedal only wastes air; the check is made with the pedal released.
ID T8-D-003 · Task T8-D-1 (ASE task list)
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A tractor's clutch does not release fully, so it drags and the gears clash when shifting from a stop. Any of these could cause the drag EXCEPT:
- too much free pedal in the linkage.
- no free pedal at the clutch pedal.
- a warped clutch disc.
- a disc hub binding on the input shaft splines.
Show the answer
B. Correct. With no free pedal, the release bearing is held against the release fork all the time and the clutch is partly released while engaged, so it slips rather than drags. Too much free pedal, a binding hub and a warped disc all keep the disc turning with the clutch released.
Why not the others
A. Free pedal is lost motion before the release bearing moves, so too much of it leaves too little pedal travel to pull the pressure plate fully away. This can cause the drag.
C. A warped disc keeps rubbing the flywheel or pressure plate even with the clutch released. This can cause the drag.
D. A hub that cannot slide on the input shaft splines holds the disc against the flywheel after the pressure plate releases. This can cause the drag.
ID T8-D-024 · Task T8-D-33 (ASE task list)
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At a PMI, a truck's integral power steering gear is coated with wet, dirty fluid, and the source of the leak cannot be seen. Which step will find where it is leaking?
- Clean the gear dry, run the engine and turn the wheel, then look for fresh fluid
- Tighten every cover and housing bolt on the gear, then recheck it at the next PMI
- Replace the sector shaft seal, since it is the seal on the gear that leaks most often
- Find where fluid drips off the gear, since the drip shows the leak
Show the answer
A. Correct. Cleaning removes the old fluid and grime that hide the source, and turning the wheel with the engine running pressurizes the gear so the leak shows as fresh fluid at one seal, cover or fitting. Only then is the right part repaired.
Why not the others
B. Tightening bolts at random may stop nothing and can distort a cover or strip a thread, and the source is still unknown. The gear is cleaned and run under pressure to find the leak first.
C. Replacing a seal on a guess is a parts-cannon repair; the leak could be at the input shaft seal, a cover or a hose fitting. The gear is cleaned, pressurized and watched to find the actual source.
D. Fluid runs down the housing and is blown back by air flow before it drips, so the drip point is usually below and behind the leak, not at it. The gear is cleaned dry and run under pressure so the fresh fluid shows the actual source.
ID T8-D-047 · Task T8-D-52 (ASE task list)
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At a PMI, a steel disc wheel on a trailer has a crack running from the edge of one of its hand holes. What is the needed action?
- Replace the wheel and hold the trailer out of service
- Weld the crack and repaint the wheel to seal it
- Drill a hole at the end of the crack to stop it
- Record it and recheck the crack's length at the next PMI
Show the answer
A. Correct. A cracked wheel can fail under load, and a federal rule (49 CFR 393.205) says wheels and rims shall not be cracked or broken. The wheel is replaced, and the others are checked for the same damage.
Why not the others
B. Welding changes the steel's heat treatment and leaves a weak zone, so a cracked wheel is never repaired by welding. It is replaced.
C. Stop-drilling is used on some structural cracks, but a cracked wheel stays cracked and can still fail. It is replaced.
D. A cracked wheel is not left in service to be watched; it is replaced now, before the trailer runs.
ID T8-D-065 · Task T8-D-65 (ASE task list) · 49 CFR 393.205
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During a road test, a truck's speedometer is checked over one measured mile between highway mile markers. Holding a steady 65 mph on the speedometer, the truck covers the mile in 58.0 seconds; the fleet allows the speedometer to read within 2 mph of true speed. What is the truck's true speed?
- 58.0 mph
- 62.1 mph
- 65.0 mph
- 67.9 mph
Show the answer
B. Correct. An hour is 3,600 seconds, so a mile in 58.0 seconds is 3,600 / 58.0 = 62.1 mph. The speedometer reads 65 - 62.1 = 2.9 mph high, outside the fleet's 2 mph allowance, so the error goes on the inspection report and the speed calibration is checked.
Why not the others
A. This reads the 58.0 seconds as if it were the speed. Speed is distance over time: one mile in 58.0 seconds is 3,600 / 58.0 = 62.1 mph, not 58.0 mph.
C. This takes the speedometer as correct. At a true 65 mph the mile would take 3,600 / 65 = 55.4 seconds, not 58.0, so the truck is slower than indicated: 3,600 / 58.0 = 62.1 mph.
D. This adds the 2.9 mph error instead of subtracting it (65 + 2.9). Taking longer than 55.4 seconds over the mile means the truck is slower than 65 mph: 3,600 / 58.0 = 62.1 mph.
ID T8-E-003 · Task T8-E-2 (ASE task list)
03Answer key
| Question | Answer | Content area |
|---|---|---|
| Q1 | B | Engine Systems |
| Q2 | C | Engine Systems |
| Q3 | A | Cab and Hood |
| Q4 | D | Electrical/Electronics |
| Q5 | D | Electrical/Electronics |
| Q6 | C | Frame and Chassis |
| Q7 | B | Frame and Chassis |
| Q8 | A | Frame and Chassis |
| Q9 | A | Frame and Chassis |
| Q10 | B | Road/Operational Test |
04Questions by content area
Working on one part of the T8 test? Each content area has its own page with five more free questions.
05More free questions
The T8 study guide covers each content area and how to study for it, and the ASE T8 Preventive Maintenance Inspection (PMI) practice test page describes the full T8 question bank. The same free format is available for the other 15 tests.
How these questions are written and checked: how our questions are made. Found a mistake? Tell us and we will fix it.
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.