Soft pedal on '62 Valiant V8 conversion

Just bcause u are using a dual chamber master cylinder is not enough, it needs to be.a.dual for front disc brakes, otherwise the bore will be too small to push enough fluid. The KH calipers are 4 piston. Thats a lot of fluid to push compared to front drum wheel cylinders.

If you are using a drum/drum dual chamber master swap it for a disc/drum one, bleed the brakes, then check, also make sure linkage rod is correct length, and rear shoes are adjusted properly.

Just my .02
Matt