This is a manual brake system. They front brakes are the 4 piston Kelsey-Hayes discs with a 4" bolt pattern but looks like they must have come off a donor car. The Master Cylinder has the same size compartments, therefore the car was originally an all drum brake car. From what I can gather, this can cause future brake failure once the front pads wear down and the front system will starve for oil. I will be changing the master cylinder to a newer style with the front disk brake capacity. Thank you!