Brake proportioning valve I got to use with a front disc brake conversion on my 55. I went with a Wilwood master and valve so I didn't need this. This is a new in the box disc\ drum proportioning valve that can be used on 1954-1956 ford disc brake conversions. This will also work on the 1955-1957 thunderbird disc brake conversions. Included is the adaptor for the brake light switch. It looks pretty generic so I would probably work in other applications where you are not mounting it with the Master Cylindar bracket it comes with. $50.00 shipped to the lower 48.