I just found my dream car and bought my second 55. i now have twins. The new one has Disc front and drum rear. The power brakes scare me. They are firm but just do not stop fast enough for me. I have a friend with a long hot rod back ground. He says they are fine to him. I know there is a proportion valve. But I see no adjutment to it. Now I may be about to solve the problem because it is also geared to low for me. I am about to replace the rear end with a an 8.8 F*&^ with disc.