Hello, I'm new. I just bought a 66 C-60. The previous owner recently put a new master cylinder on, the old one was leaking. He bled and adjusted the brakes. But you have to pump the brakes 3 times to get a good pedal. When you do this you get a good firm pedal and the truck stops good. The previous owner pumped about 2 gallons of brake fluid through the system trying to solve this problem. I have checked his work and find nothing wrong. What do I try now? Thanks
