K-H brake swap done, but doesnt stop!

So, they went to the 73 and up design because of sticking pistons in the KH calipers. I drove my Demon with brand new KH calipers back in the late 80's, and in just two years I had one stuck piston per side. Get a friend to SLOWLY push the pedal with a pad removed so you can watch the travel. Must be gentle to prevent the piston from popping out.