Tennessee cdl Air Brakes - Test 1
Number of questions: 25
Passing score: 80%
Acceptable number of errors: 5
This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Commercial Driver Guide. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
To DMV Handbooks1. Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:
A
√
Air pressure falls below 45 psi.
B
×
Air pressure falls below 20 psi.
C
×
Driving downhill.
D
×
Driving uphill.