Master Cylinder issues

[thedudeabides86]

Hey everybody! I hope the weekend went well for you all. I had an issue over the weekend with my '72 C20 3/4 ton. I checked the brake fluid in it and noticed the front chamber of the master cylinder was empty but the back one was full. I filled the front one adequately and tried taking a drive. I could barely keep the engine running and it kept stalling and dying on me. I got back to the house and pulled the ol turkey baster out and sucked out the brake fluid I had just added and the motor started right up and stayed started. In fact, I drove it 60 or so miles round trip for the first time in 10 years. So, What might be the problem? Was I sucking brake fluid into the motor? Cutting off air to the motor? Do I only have the rear brakes working since the front chamber is empty? Most everything I do to repair this truck is a "learn as you go" kinda deal for me. I appreciate all the help I've gotten over the years from you all out there. Thanks in advance!