310T Cheat Sheet 2026

The 30 highest-yield 310T facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is a core component of practical training for technicians? → Preventive maintenance techniques
2. What document is essential to prove eligibility for certification? → Proof of apprenticeship completion
3. When renewing a 310T credential in a province that requires renewal, which of the following is most commonly required? → Completing approved continuing education credits
4. What type of valve modulates air pressure to each wheel independently during ABS activation? → Modulator valve (ABS solenoid valve)
5. What does the 'torque multiplication ratio' of a torque converter represent? → The ratio of output torque to input torque at stall condition
6. During a brake application, the left front wheel locks up while the right front remains normal. This symptom MOST likely indicates: → A stuck open ABS modulator valve on the left front
7. On a combination vehicle, which valve automatically closes to protect the tractor air supply if trailer air pressure drops rapidly? → Tractor protection valve
8. Which condition found during a battery inspection indicates the battery must be replaced? → Case swelling, a cracked housing, or capacity below 80% on a load test
9. A truck technician interested in government employment should explore opportunities with which type of agency? → State and municipal transit authorities, school districts, and military vehicle depots
10. Which components are inspected to confirm the air dryer is functioning correctly during PM? → Purge valve operation and desiccant cartridge condition
11. A truck's air dryer purge valve is constantly exhausting air. What is the MOST likely cause? → Excessive compressor oil carry-over clogging the desiccant
12. During evaluation of a coach's door system, pneumatically operated doors open slowly but close at normal speed. The MOST likely cause is: → A restricted or maladjusted opening-direction flow control valve
13. A coach technician is replacing fuel filters on a common rail diesel. After installation, the correct bleeding procedure is to: → Use a hand primer pump to fill the filters before cranking
14. How is engine coolant freeze protection most accurately tested during preventive maintenance? → With a refractometer or hydrometer to measure specific gravity or freeze point
15. The parking brake dash control valve pops out (applies) immediately after it is pushed in. What is the MOST likely cause? → System reservoir pressure is below hold-in threshold
16. When evaluating exhaust back pressure on a diesel engine, a reading of 3.5 inches Hg at rated RPM indicates: → Normal back pressure within acceptable limits
17. What does it indicate when a brake chamber push rod stroke exceeds the maximum allowable limit? → The brakes are under-adjusted or excessively worn, reducing braking effectiveness
18. What happens to the spring brakes when the parking brake control valve is pushed IN on a truck? → Spring brakes release
19. In a tandem drive axle arrangement, the purpose of the inter-axle differential (power divider) is to: → Distribute torque equally between the front and rear drive axles
20. A Class 8 truck repeatedly trips the low air pressure warning at 60 psi within minutes of starting the engine. What should be checked FIRST? → Compressor belt tension and condition
21. A vehicle equipped with an automatic transmission exhibits abnormal noise only in Park and Neutral but not in Drive or Reverse. The MOST likely cause is: → Worn or damaged torque converter pilot hub or front pump bushing
22. Which test is used to verify the compressor governor cut-in and cut-out pressures? → Governor pressure test using a calibrated gauge at the wet tank
23. An Allison automatic transmission control module (TCM) stores a code for 'transmission range inhibit.' What does this indicate? → The gear selector position sensor disagrees with the actual range selected
24. A technician hears air leaking from the exhaust port of the brake application valve when brakes are fully released. This indicates: → A leaking primary or secondary inlet valve seat
25. What is the correct source for wheel-end fastener torque values when reinstalling hubs or wheels during PM? → The vehicle or axle manufacturer's torque specification
26. Which of the following symptoms is most commonly associated with a clogged fuel filter in a heavy-duty truck? → Loss of power, especially during acceleration or when climbing grades
27. During a transmission fluid analysis on a heavy-duty automatic, the technician finds the fluid is milky white. What does this indicate? → Water or coolant contamination
28. What tool is used to accurately measure the push rod stroke of a brake chamber to determine if it exceeds the adjustment limit? → Steel ruler applied at full brake application
29. On a tractor-trailer combination, the trailer supply valve (also called the tractor protection valve control) is normally what color? → Red
30. How does the shortage of qualified commercial truck technicians in the US affect career opportunities for 310T holders? → It creates stronger negotiating power for wages and benefits for certified technicians