ASE T8 Preventive Maintenance Inspection (Medium/Heavy Truck) study plan

List the inspection items on a DOT-style pre-trip and post-trip checklist from memory, then verify against a reference and mark every omission

Define the out-of-service criteria categories for brakes, coupling devices, and tires and state which defects place a vehicle out of service

Explain the difference between a maintenance inspection record and a driver vehicle inspection report, and describe who signs each

Practice writing a defect description that names the component, the condition, and the location so a technician can act on it

Sequence a full walk-around inspection in a fixed order and time yourself performing it twice

Identify the recordkeeping requirements for annual inspections and where the inspection decal or documentation is retained

Describe how to document a repaired defect from driver report through repair sign-off

Distinguish between safety-sensitive and non-safety defects and justify the priority you assign to each

Measure brake chamber pushrod travel and compare results against the adjustment limit for each chamber type

Describe how to perform a brake adjustment check and identify when an automatic slack adjuster is functioning incorrectly

Trace the path of air from compressor to brake chamber and name the function of each valve along the way

List the fluid and lubricant checks performed during a routine inspection and state the acceptance criteria for each

Identify the signs of coolant, oil, and fuel leaks and describe how to determine the source

Inspect steering linkage, kingpins, and tie rod ends for play and describe the correct method for checking each

Describe how to check suspension components including springs, air bags, shocks, and torque arms for wear or damage

Explain the purpose and service interval logic for engine oil, oil filters, fuel filters, and air filters

Describe how to check tire condition, tread depth, and inflation and state the rejection criteria

Perform a leak-down test procedure on an air brake system and interpret the results

Test a battery set for state of charge and load capacity and interpret the results against specifications

Trace a charging system fault from alternator output through the regulator and identify the failed component

Diagnose a no-crank condition by testing the starting circuit in a logical sequence

Inspect cab components including mirrors, wipers, horn, heater and defroster, and seat belts and state the acceptance criteria

Check hood and cab mounting, latches, and hinges for security and wear

Describe how to inspect and test lighting circuits including clearance, marker, stop, turn, and hazard lamps

Explain the function of the data bus and identify symptoms that point to a communication fault rather than a component fault

Inspect cab air conditioning and heating operation and describe the checks that confirm proper function

Describe how to verify gauge and warning indicator operation during an inspection

Inspect the driveline including yokes, U-joints, and slip joints for wear and describe the correct check for each

Describe how to check differential and transmission fluid levels and identify the causes of abnormal fluid condition

Explain clutch adjustment and inspection points and identify symptoms of a worn clutch

Describe the checks for engine mounts, belts, and hoses and state the rejection criteria for each

Identify the sources of oil consumption and describe how to investigate each

Complete a timed full-length practice exam and score it by domain

Re-study the two domains with the lowest practice scores and re-test those areas

Recite the out-of-service criteria and inspection documentation requirements without reference

Walk through a complete inspection end to end from memory and narrate each step