Back in 1980, my father had recently started driving a semi truck, having been a somewhat unsuccessful property developer prior to that. Somehow, I was getting dragged into the plan. At that time, all that was required to drive a semi truck was to go get a chauffeurs license, then get hired by a trucking company, after taking an open book test on the regulations. Piece of cake! I was now an over the road truck driver, even though I really didn't know anything about the job!
He had a heart attacka short time later, and I was obliged to support my parents at the tender age of 24. I did that for about a year and a half, then we got into grounds maintenance. [We also did that with no training whatsoever!]
Many years later, I discovered that I needed more than a chauffeurs license, and I tried to grandfather in on the CDL test. Sadly, it would seem that I attempted to do that on the last possible legal date to do so, and the Highway Patrol office wouldn't let me take the written test!
So...I took my Class A test in my old rollback wrecker with air brakes, towing my electric brake heavy haul trailer (both were class A vehicles). This old beater truck would barely pass any pretrip inspection, and it developed a worse air leak in the main brake control valve when I took the test. The Highway Patrol gave me one hour to correct the air leak otherwise I would be obliged to test again another day.
I went down the road 1 mile to the nearest truck stop, purchased a little brass plug that obscured the relief-port from the main brake control valve, and presto! No more air leak! There was just one little drawback, however: by plugging the relief port, I prevented the air brake control valve from releasing the brakes after they had been applied.
Hah! Who needs brakes? I finished the pre-trip inpection, then I took the entire driving test without hardly ever touching the brakes. It took about 10 seconds for the brakes to release, and that just appeared to make me extra careful at every stop sign. The Highway Patrol never knew that anything was wrong with the brakes, and I passed with flying colors and a high score.
Who would have thought that you would have to make your truck more dangerous to drive in order to pass the test?