Forum Discussion
rowekmr
Aug 05, 2015Explorer
When I was studying for my CDL in the early 90's they talked about the "Johnson" bar in the cab for the trailer brakes and how you'd apply them to keep trailer in line, avoid jackknifing, etc but when I went to upgrade back a few years ago there wasn't any talk about that. Actually they only used it to test the trailer brakes before the start of the trip for the practical and that was it's only mention/use.
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