This manual covers the Bruin 350 and Bruin 400 All-Terrain Vehicles (ATVs) produced between 2004 and 2006. The Bruin series is recognized for its dependable single-cylinder engines and comfortable ride, with the Bruin 400 models featuring an on-demand 4WD system. These mid-size utility ATVs were designed for both recreational use and light work, offering a blend of capability and rider comfort that positioned them competitively in the market. The heritage in ATV manufacturing underscores the engineering quality and reliability inherent in these models, making them a popular choice for various off-road applications. This comprehensive workshop service repair manual provides detailed guidance for owners and technicians alike. It covers essential maintenance procedures, from routine oil changes and filter replacements to more involved tasks like engine overhauls, transmission servicing, and brake system repairs. The manual includes in-depth information on the electrical system, suspension, steering, and frame, along with troubleshooting guides for common issues. With step-by-step instructions, torque specifications, and diagnostic procedures, this manual is an invaluable resource for ensuring the proper maintenance, repair, and longevity of your Bruin ATV.