Wilwood Brake Proportioning Valve - Knob Type. Needed for Rear Disc brake Conversions,
Wilwood Proportion Valves are designed to be used on cars that have aftermarket rear disc brake kits installed.
When you upgrade your rear brakes the stock brake proportion valve is not needed as its designed for drum brakes.
Installation is simple. You will need to do some adapations to the brake hardlines. Datsun Hardlines are M10 x 1.0 thread; Wilwood proportion valve kits come in standard 3/8 size. Adaptors are available if needed for $10.