I'm crawling around under the 82 245 GLT and notice the wire is off the little brake line junction box behind the drivers front wheel. When I re-connect it, the brake failure light comes on. I understand that theres a little piston in there that shorts to ground if the brake pressure has ever been unequal front to rear. Brakes are fine at the moment, I'm wanting to know the correct way to reset the piston to the center of its travel. Should I try bleeding from the front and rear systems at the calipers until the light goes off or is there an easier way?