Hi Fabo, I'm building a '70 Duster and I'm running power disc brakes to all 4 wheels, with a Moser 8/34 rear end. I'm about to purchase the brake line kit and was wondering about the correct valving. I'm using Right Stuff components and the calipers are already installed on all 4 corners, just waiting for the lines. 1) Will I require a Hold Off Valve to the rear? I'm under the impression that this valve was used with rear drum brakes to allow the fronts to grab first, and avoid the back end from getting sideways. Is that a drum brake specific thing, or does this also apply to rear disc applications? 2) Proportioning valve? Should I be using a prop valve, or just a metering valve for a 4 wheel disc set up? I always thought the prop valve was just to regulate fluid to the rear drums (wheel cylinders) to avoid lock up. I'll be using a 1 1/8" master cylinder, with a 9" dual booster. I just want to make sure the car is safe, so any help with the brake line/valve set up is greatly appreciated. Thanks in advance!