Bus Maintainer, Chassis - Paperbackby Passbooks (Compiled by) The Bus Maintainer, Chassis Passbook(R) prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: installation, troubleshooting, testing and repair of automotive systems, such as engines, electrical, brakes, air conditioning and transmissions;