My 66 C10 had a single master cylinder with drum brakes that I wanted to update.
I purchased new drum brakes all around, a dual master cylinder and power brake booster. A new line was run to the back brakes, and everything was installed, brakes bled, etc.
Now, the fluid is going the wrong way and not reaching the brakes. Suspecting a bad master cylinder, I had it replaced and it is doing the same thing. Has anyone seen this when changing out the master cylinder?


Will Mahle