Using a disc brake master cylinder in a drume brake car.

Don't take comments personal it will get to you after a while. With disc on the front only, The pressure needed is different from front to rear . If you have 4 wheel disc you can use that proportioning valve for 4 wheel drum, But up grade to a 4 wheel disc plastic reservoir master where the reservoirs are connected so front and rear both have a large capacity of fluid. I too have seen many disc brake cars with drum brake masters. But its really not safe.

HAPPY NEW YEAR! Welcome to FABO you'll get use to it. Steve