This is a comprehensive 8-book set from the Delmar Cengage Learning ASE Test Preparation Series, 4th Edition, designed for Medium/Heavy Duty Truck Technician Certification. Each book focuses on a specific ASE test (T1-T8), providing thorough study guides and practice questions to help technicians prepare for their certification exams. The set covers Gasoline Engines (Test T1), Diesel Engines (Test T2), Drive Train (Test T3), Brakes (Test T4), Suspension & Steering (Test T5), Electrical / Electronic Systems (Test T6), Heating, Ventilation & Air Conditioning (Test T7), and Preventive Maintenance Inspection (Test T8). These guides are essential resources for anyone seeking to achieve ASE certification in truck maintenance and repair.