2024 AR CDL Practice Test: Class A - Test 7 Based on 2024 AR CDL Handbook 18. What part of the truck is the air compressor connected to? A The air tractor valve. B The wheel. C The brakes. D The engine. Next More 18/30 Progress 0 Errors Restart Next Next Class A - Test 7 Back to Test List Class A - Test 6 Class A - Test 8 Challenge Library 12 More AR CDL Practice Tests 8 Class A - Test 8 9 Class B - Test 10 Class B - Test 2 11 Class B - Test 3 12 Class B - Test 4 13 Class B - Test 5 14 Class B - Test 6 15 Class B - Test 7 16 HazMat - Test 17 HazMat - Test 2