ASE Medium/Heavy Truck T-Series guide exam help

ASE Medium/Heavy Truck T-Series is the ASE certification path for medium/heavy truck technicians. The 2026 ASE Medium/Heavy Truck Study Guide covers Gasoline Engines (T1), Diesel Engines (T2), Drive Train (T3), Brakes (T4), Suspension and Steering (T5), Electrical/Electronic Systems (T6), Heating, Ventilation, and Air Conditioning Systems (T7), and Preventive Maintenance Inspection (T8). ASE marks T2 through T8 as required for recognition as an ASE Certified Master Medium/Heavy Truck Technician. Certification in this series requires passing the relevant test and documenting 2 years of relevant work experience, with appropriate vocational training able to count toward the requirement. Each T-Series certification test includes 10 unscored research questions in the total question count: T1 is 60 total/50 scored questions in 75 minutes, T2 is 65/55 in 90 minutes, T3 is 50/40 in 60 minutes, T4 is 60/50 in 75 minutes, T5 is 60/50 in 75 minutes, T6 is 60/50 in 90 minutes, T7 is 50/40 in 60 minutes, and T8 is 60/50 in 75 minutes. Recertification tests are shorter and require prior certification: T1, T4, T5, and T8 list 25 questions in 30 minutes; T2 lists 28 questions in 45 minutes; T3 and T7 list 20 questions in 30 minutes; and T6 lists 25 questions in 45 minutes. Preparation should be test-specific: T2 emphasizes diesel fuel systems and general engine diagnosis, T4 is heavily weighted toward air brakes, T6 toward electrical diagnosis and related vehicle systems, T7 toward A/C systems, and T8 toward frame/chassis plus engine and electrical inspection.