I went through this same issue with the shuttle valve when bleeding my brakes. I also had the Ford part # but could not find a direct replacement (most that look similar are for disc/drum cars). I also purchased the "rebuild kit" from MuscleCar Research which did not solve the problem. I even sent my shuttle valve to the owner of MuscleCar Research which he rebuilt for a fee and it still didn't work correctly. After talking to Scott Bell of SACC Restorations, I removed the shuttle valve and replaced it with a T - Problem fixed and the only downside is i won't get a light if brake pressure is low but if that happens you'll figure it out quickly. Scott is very knowledgeable and helpful so if you need to buy anything for Pantera brakes, he'd be my first call
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