@rplst8 posted:Why? I’m taking the other posters at their word, but a cut of cars that are sitting could eventually leak the air pressure required to hold the brake on.
Also, after doing a little Googling, apparently an over application of the train brake can deplete the air and lead to the inability of the triple-valve to detect an emergency condition.
https://en.m.wikipedia.org/wik...ir_brake#LimitationsOn a tractor trailer, you lose air, your truck stops. The brakes are applied and don’t let off until air is restored.
Correct