Sorry to take so long getting back to you. Been out of town every day helping a friend repair smashed cars in his body shop.
No need to make this harder than it is. Sounds like you found it. The line is rusted out. There will be other steel lines in the area, especially if you have anti-lock brakes.
Cadillac also had a lot more trouble than normal with leaking combination valves. If you do not have anti-lock brakes, follow the two steel lines down from the master cylinder to a small brass block on the frame rail. Those valves rarely cause a problem but some on Cadillacs leak on the back side and it will run down the lines. Those normally leak pretty slowly. As fast as you're losing brake fluid I think it's the steel line.
Wednesday, May 22nd, 2013 AT 9:03 PM