I have a 1995 chevy s10 pickup 4.3 4x4. I had a squeqy brake (brakes worked fine, just made alot of noise). Borught it to a mechanic, and$300 later i had new front brakes and the noise was gone. About a week later, the brake pedal went down to the floor. Then when i tried it again, the peda; only went down about 2 inches and felt like it hit the floor. I couldnt push it, yet the brakes wearnt working or slowing down. I then broguht it to a shop, and for $200 they put in a new master cyclindar. A week later the same thing happened. Anyone have any ideas of whats wrong? I spendt too much on this truck already.