Our Black Out power brake conversion for the 1948-52 Ford F1trucks consists of a 9″ Black Booster and black POL or Wilwood master cylinder and Black Out adjustable proportioning valve. This kit contains a powder coated booster, black POL or Wilwood high performance master cylinder, black adjustable prop valve and black powder coated brackets to add a nice professional detailed look to your classic. Improves stopping and driver performance tremendously.