I have a 1979 Firebird and one morning as I pulled out into the street. I push down all the way on the brakes and then it will very slowly began to brake. I checked the master cylinder and thats not the problem. The car WAS leaking a fluid the day of the faliure that seemed like brake fluid, but apparently it has stopped to leak since I have not turned on my car in a few days. How can I check to see whats wrong? I cant drive anywhere unless the brakes start to work, so any help would be appreciated! I also know there is air in the system as of now, but the fluid level in the master cylinder has always been full.
By the way the fronts are disks and rears are drums