Another update to this brake issue. I'm getting the part #'s for some commercial brake chambers. The BAE requirement on the park brake system was to hold truck at a 30 degree incline. So when theres a fluctuation in air pressure the brakes come on. As LE we don't need that heavy of a park spring in these units we don't have all the exterior added on reactive armor. I'm getting the part # on these and will share this info as soon as I have it. I've also got a copy of the Meritor Maintenance procedures manual and Meritor Parts manual. As soon as I have these #'s I will order all the parts and update with my results.