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I have a 1989 Jeep Comanche without ABS. It was originally 2-wheel drive, but I began the conversion process by swapping in a front axle from a 1993 Jeep Cherokee with ABS. After that was put and the system bled we went to test it and found we were without brakes. The pedal went to the floor. It could be pumped up without leaking down, but after it was let off for a few seconds, it would again push straight to the floor. We found the proportioning valve was stuck, so it was replaced along with the weak, old master cylinder. The height-sensing system in the back was eliminated by running a new hard line. Also, the front axle was equipped with new calipers, rotors, pads, and flex-lines. I have yet to find any leaks, yet the pedal is just the same. Could it be the fact that I am running ABS calipers (which are a bit bigger) on a non-ABS system? Or is it something else??