2024 CA CDL Practice Test: Class B - Test 7 Based on 2024 CA CDL Handbook 27. What is a “wig wag”? A A low pressure warning system B A tube that carries air to the brakes C A type of air brake system Next More 27/29 Progress 0 Errors Restart Next Next Class B - Test 7 Back to Test List Class B - Test 6 HazMat - Test Challenge Library 12 More CA CDL Practice Tests 16 HazMat - Test 17 HazMat - Test 2 18 HazMat - Test 3 19 HazMat - Test 4 20 HazMat - Test 5 21 HazMat - Test 6 22 Passenger - Test 23 Passenger - Test 2 24 Double and Triples - Test 25 Double and Triples - Test 2