Brake Hose Problems

[5150]

Well, I've noticed the last few times I've been driving the truck it seems to want to pull up when I let off of the gas. It has also started shaking a lot the last few times I drive it, but not all the time. I drove it to work the other day and when I got to work my pass side front rotor was blue. Now, don't make too much fun of me because this is what was on it when I bought the truck, but it originally was an all drum brake truck. When I bought it somebody had already done the front disc brake swap, but I don't know what year they used. They also kept the DRUM brake hoses which I noticed but didn't change figuring that they stop the truck. But now I think that may be my problem. I've posted a pic of both sides of my disc brakes, original hoses, and also every RIGHT brake hose that CHEVY made for disc brakes from 71-87. The only one that doesn't have a bad angle to even fit on the right side caliper is the 71-72 hose. Any thoughts???