310T Red Seal — Truck & Transport Mechanic

About the 310T Red Seal Exam — Truck & Transport Mechanic

The 310T Truck and Transport Mechanic Red Seal exam is Canada's nationally recognized certification for diagnosing, repairing, and maintaining heavy-duty trucks, trailers, and transport equipment. Passing the 310T gives you an Interprovincial Red Seal endorsement — meaning your ticket is recognized in every Canadian province and territory without re-examination.

The exam consists of 135 multiple-choice questions based on the 2023 Red Seal Occupational Standard (RSOS), requiring a minimum score of 70% to pass. You have 4 hours to complete the exam.

Official 310T Exam Breakdown (red-seal.ca)

Red Seal publishes how the 135 questions on the real 310T exam are distributed across its Major Work Activities:

• A — Common Occupational Skills — 8 questions (6%)
• B — Services, diagnoses and repairs engines and supporting systems — 21 questions (16%)
• C — Services, diagnoses and repairs air systems and brake systems — 17 questions (13%)
• D — Services, diagnoses and repairs electrical and electronic systems — 22 questions (16%)
• E — Services, diagnoses and repairs drive trains — 17 questions (13%)
• F — Services, diagnoses and repairs steering, chassis/frames, suspensions, tires, wheels and hubs — 18 questions (13%)
• G — Services, diagnoses and repairs cabs — 5 questions (4%)
• H — Services, diagnoses and repairs trailers — 8 questions (6%)
• I — Services, diagnoses and repairs climate control systems — 7 questions (5%)
• J — Services, diagnoses and repairs hydraulic systems — 8 questions (6%)
• K — Services, diagnoses and repairs hybrid and electric vehicles (EV) — 4 questions (3%)

Every question is four-option multiple choice with one correct answer, the writing time is four hours and the pass mark is 70%. Source: 310T exam information, red-seal.ca. Exams are periodically rewritten to updated occupational standards, so check that page before you book.

What this question bank covers

These are the topic areas in this practice bank and what each one covers. The real 310T exam has 135 questions and a four-hour writing time. How those questions are distributed across the official blocks is published by Red Seal — see the 310T exam information page.

• Air Brake Systems — The largest and most important block. Covers CVSA Level 1 inspections, S-cam and disc brake adjustment, dual-circuit air systems, ABS/ATC, glad hands, and brake fade. Many candidates underestimate this section — it's heavily weighted and highly practical.
• Diesel Engine Systems — Fuel injection (common-rail, HEUI), EGR, DPF/DEF aftertreatment, turbocharger operation, cooling systems, and engine diagnostics. Expect J1939 fault codes.
• Electrical & Electronic Systems — CAN bus (J1939/J1587), multiplexing, chassis wiring, ABS module diagnostics, telematics, and 12V/24V systems. Wiring diagrams appear frequently.
• Drivetrain & Wheels — Manual and automatic transmissions (Allison, Eaton Fuller), rear axle differentials, driveshaft angles, tire sizing/inflation (TPMS), and wheel-end bearings.
• Regulations & Inspections — National Safety Code (NSC) standards, Commercial Vehicle Safety Alliance (CVSA) inspection levels, federal Hours of Service, dangerous goods placarding (TDG), pre-trip/post-trip inspection requirements.
• Cab & Body Systems — HVAC, electrical accessories, sleeper systems, fifth-wheel and kingpin specs, and coupling procedures.

Exam Strategy for 310T

Air brakes first. With 25% of the exam dedicated to air brake systems, spending extra study time here has the highest return. Understand the dual-circuit system, CVSA out-of-service criteria, and brake timing standards cold.

Know your fault codes. J1939 fault code structure (SPN/FMI) appears in several questions — know what the parameters mean, not just the code numbers. Questions often describe a symptom and ask you to identify the cause based on live data.

The regulations are pass/fail knowledge. The compliance section is rule-based — either you know the regulation or you don't. Memorize the NSC inspection intervals, HOS exceptions, CVSA inspection levels, and TDG placard weight thresholds.

How to Use This Practice Tool

This practice tool includes 161 questions across all 6 topic blocks at three difficulty levels — Easy, Medium, and Hard. Use Topic Filter to drill your weakest areas. Use Mock Exam Mode to simulate the real 135-question exam under timed conditions. Check Wrong Bank (📕 tab) to review every question you missed. After each session, review the full explanation — not just whether you got it right.

Related reading: How to Pass the 310T Red Seal Exam | 310T Salary Guide | Truck & Transport Mechanic Career Guide