iv About the Authors Chris Johanson has been involved in the automotive service business for more than 35 years, working as a technician, an instructor, and an author. Mr. Johanson has extensive experience in the service and repair of all automotive sys- tems and is an ASE Certifi ed Master Technician. He also has ASE certifi cations in Advanced Engine Performance, Light Vehicle Diesel Engines, Light-Duty Hybrid Electric Systems, Refrigerant Recovery and Recycling, Auto Maintenance and Light Repair, and Undercar Specialist Exhaust Systems. Mr. Johanson has authored or coauthored several automo- tive textbooks, including Auto Brakes, Auto Suspension and Steering, Auto Heating and Air Conditioning, Auto Engine Performance and Driveability, Automatic Transmissions and Transaxles, Manual Drive Trains and Axles, Auto Fundamentals, and Auto Service and Repair. He is a member of the South Carolina Chapter of the National Association of College Automotive Teachers, enjoys restoring and main- taining classic vehicles, and is actively involved with the South Carolina Chapter of the Pontiac-Oakland Club International. Martin T. Stockel received his degree from College of the Redwoods in Eureka, California, and completed additional automotive-related coursework at Humboldt State University in Arcata, California. He honed his automotive skills by working as a service technician at independent shops and automobile dealerships. Mr. Stockel is the coauthor of several automotive technology titles, including Auto Fundamentals, Auto Brakes, and Auto Suspension and Steering.