This is the easiest way to convert your early GM 1/2-ton drum system to power brakes. If you have modified your pick-up to cruise easily at freeway speeds it may be crying out for better brakes. This bolt on power brake kit gives an upgrade on your stock truck that should be a consideration on your daily driver. On the 1955-1959 bolt on system, remove your stock master cylinder and bolt in our dual chamber master cylinder, booster, and mounting bracket to the frame. Use your stock brake pedal with a special connecting rod, Our system retains your stock clutch linkage if an automatic system is not used. Both clutch and brake pedals remain in stock position. This is a true bolt in power brake system. WARNING: This system is not designed for disc brakes! It has a drum type dual chambered master cylinder for safety. If you plan to add the disc brake option later, consider our power disc brake conversion kit, HPB165. This dual chambered master cylinder is designed for disc brakes.Sold as kit.Made in USASHIPS DIRECT FROM THE MANUFACTURER