Find out what cables actually apply the brake and if full 12Vdc is needed to actuate the brake, insert a rellay that when the solenoid is off the original signals pass through and when the brake away system is activated the conection is diverted to an electronically controled and timed application of the braking system that does not send a signal to the computers but only to the bake actuator, that way you have a brake system when pulling and your normal brake actuation when not being towed.
Way back when the world was flat and the brakes failed on my WB bus comming down a mountain, I used the parking brake to get me home, cost me new rear drums, shoes and a new master cylinder but I made it down and home.
navegator
