2024 AK CDL Practice Test: Air Brakes - Test Based on 2024 AK CDL Handbook 15. When the spring brakes are on, you should never: A Turn on the lights. B Turn off the vehicle. C Push down the brake pedal. Next More 15/25 Progress 0 Errors Restart Next Next Air Brakes - Test Back to Test List Tank - Test 5 All - Test Challenge Library 12 More AK CDL Practice Tests 35 All - Test 36 All - Test 2 37 All - Test 3 38 Tank and Hazmat - Test 39 Tank and Hazmat - Test 2 40 Class C - Test 41 Class C - Test 2 42 Class C - Test 3 43 Class C - Test 4 44 Class C - Test 5