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AIR BRAKE LEAK DOWN TEST

http://www.part380.com/si393.html Doing the air brake leak down test lets you know 1) there are no leaks and 2) the automatic slack adjusters have “adjusted,” and that the air brakes should be “in balance.” NOTE: Chock wheels and release (push IN) both red and yellow knobs (or yellow knob on a straight truck) to avoid compounding the brakes.