On my 84 Deville the brake line that goes from the front to rear was rusted out in a spot. I had no power in the rear. I replaced all pads, and shoes, replaced the line, and put new fluid in and bled all four brakes in order. I got the "BRAKE" light off and was happy and had nice stopping power.After all that the brake light would come on and go off only when the car was started. That was ok. I was ready to get my car inspected, because it will fail if it has the light on. Now the light just stays on and when I go to stop, it stops ok, but I have a faint hissing noise coming from the rear drivers side drum area. Does this have something to do with the adjusters?