7 practice tests with answers a explanations on driving safely, transporting cargo safely, transporting passengers, air brakes, combination vehicles, doubles and triples, tank vehicles, and hazarous materials.They work this way so you can control the spring brakes if the service brakes fail. When parking a ... When main air pressure is lost, the spring brakes come on. Some vehicles ... Pay attention to the low-air-pressure warning light and buzzer.
|Title||:||The Best Home Study Guide for the CDL Commercial Driver License Examination|
|Author||:||Research and Education Association|
|Publisher||:||Research & Education Assoc. - 1998-10-05|