[DICK SPADARO]

Most drum drum master cylinders have a built in residual line valve if these are used on a disc brake application the line pressure is keeping the pads pressed upon the rotors, adding another in line valve creates another the problem. Your brakes should be rock solid not spongy. If you purchased a kit its good to know the brand. If you just purchased a bunch of parts the potential for problems develop.

Assuming you have the correct master cylinder your 3 lb valve should go to the disc side. If early ford brakes are being used in the rear they have a cam adjuster that limits the return of the brake shoe, no rear line valve is necessary.