Hello gentleman. I have a bit of an issue with the brakes on my 64 comet. My problem is the brakes are spongy regardless of how much I bleed them. The set-up is discs all around (granada front discs and 97 explorer rear discs) They are all of the single piston orientation. My buddy and I used 3/16 line on all of it and plumbed them into a gutted fox body distribution block. I have a proportinating valve under the driver side for the rear brakes. My original master cylinder was a 15/16 bore that had the same issue so we figured we would try the 97 explorer master cylinder since it was larger 1 1/16 bore and free. But its still doing the exact same thing and to be honest I'm kinda at a loss on where to go from here. I have double checked all the fittings for tightness and can't find any leaks. Any ideas? All help is appreciated!