Iowa 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 answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Iowa Commercial Driver License Manual. 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. Why do large vehicles use air brakes?
A
×
Other brake systems squeak too loudly.
B
√
Air brakes are very effective systems.
C
×
Other braking systems are hard to come by.