2024 CO CDL Practice Test: Class A - Test 3 Based on 2024 CO CDL Handbook 16. Trailers built before ______ are not required to have spring brakes. A 1992 B 2011 C 1975 D 1987 E 1995 Next More 16/29 Progress 0 Errors Restart Next Next Class A - Test 3 Back to Test List Class A - Test 2 Class A - Test 4 Challenge Library 12 More CO CDL Practice Tests 4 Class A - Test 4 5 Class A - Test 5 6 Class A - Test 6 7 Class A - Test 7 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