I have a 1991 Chevrolet Corsica. Our car sits for a while especially in the summertime while my wife is off from work. I recently went out to start it to see if it would run okay. It started and ran as usual, but a funny thing happened. When I put my foot on the brake pedal and got ready to shift it into gear, a sound like air slowly letting out of a balloon came from the driver's side probably around the firewall area. Also, the brake pedal went to the floor. As I hit the brake pedal, I could hear air coming from the rear brake area on the driver's side. I turned the car off and started pumping the brake pedal to see if it would stiffen up like it's supposed to when the car is off. It didn't, instead I was still able to pump the brake pedal and it was going toward the floor like it was when the car was on. I suspected the power brake booster at first but when I checked the master cylinder a day later, it had lost some brake fluid. Quite a bit, I might add, but I can still see the fluid. It was just too low than it should be. Any ideas what this might be? I've got to get this car in for a stupid e-check about mid September so I would greatly appreciate some feedback please. Thanks in advance.
