I am sure glad that I never had to do the test, too much stress. When I got my class 3, ages ago, you didn't need your Q to drive with air brakes. Then they changed the rules and grandfathered me my Q, have been driving for over 40 years now. Everything I learned about air brakes I learned underneath the unit repairing so I could get my job done.
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Proper Planning Prevents P**s-poor Performance!!
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