Nissan Pathfinder Brake problem

it really doesn't sound like abs to me, either. The only ways I can think of that an abs module would do this is if a check ball was stuck inside the hydraulic part of the module or a solenoid is stuck on. neither one of these problems would change if you unplugged the module. If I was you I would ask them to replace my rear cylinders and rebleed or do it yourself.