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Simp5782 - thanks for the info, ok will go check this out, so if i understand it. with the PTO engaged, if i push the "regular" spring brake override, they should NOT dis-engage. i have to push the spring brake override under the steering wheel while the PTO is engaged to get them to release...

Davis - i look forward to your research... since i have not tested my theory, i am inclined to think (based on no facts) it has to do with the source of air used to release the spring brake, the one under the steering wheel "might" use 2nd air rather than E-tank air. but that just a guess, i...

agreed, so why two switches, if both override the spring brake? the normal one for loss of air (an only a limited number of uses or time till the Emergency air-tank is empty), one when you need to let the brakes off when recovering, but why not just use the "normal" then too? does the one...

sounds right, the one on the right (i call it the "normal") is the one for primary and secondary air failure, once the spring brakes engage, you hit it to unlock them so you can be towed is what i thought it is for. so it sounds like they do exactly the same thing? i was thinking with the PTO...

Experts on Wrecker operation (M936A1) Have been going over the TM's, and realized i don't know the difference between the spring brake override switch (the one on the far right of the pnl) and the PTO spring brake override switch (located on the right side and just under the steering wheel). I...