One day the brakes went out on my '85 deville, took it to a place, and one of my lines was cracked and leaking, slowly but not gushing. Had a partial line replacement and that solved the problem for a while. Now my pedal is very soft and travels a long ways before i get any stopping power, but as soon as I get stopping power the pedal gets very hard to the point where I cant get the brakes to even lock up. My brake light comes on and goes off sparatically, took it to midas and the guy told me that the light was because i had a bad vacume sensor but everything else was fine, So HE being the brake expert that HE is NOT, disconnected the sensor and said my problem was solved, HA not solved at all. I reconected the sensor and found some bad vacume lines and replaced them and it helped a little bit but the brakes still are not dependable if I need to stomp on them they simply are not there for me. My fluid level is fine, So does anyone out there know what could be the problem(s). Sorry for the long post but there was alot of history for these brakes.