I put rear disks brakes on my 67 barracuda. I finaly got the chanc to put a few miles on it. When ever i come to a stop i have a load humming noise coming from the rear of the car. It onle=y does it when i push on the brake peddle. I got the brake kit from performance online. The set up design is from an 80s caddy w/ the E brake cable. Other than that they work great. Any ideas ?