Sorry guys, maybe I wasn't specific enough. I have power drums all the way around, not disc in front and drums out back. I'm not sure what this valve is that you are talking about? Is it only on disc systems? If not where is it located? I most likely am going to replace the master cylinder anyway for peace of mind but I would really like to know what the root cause of this problem is. I don't like throwing parts at problem without knowing exactly what the problem is. Either way though, I really appreciate all your help with this problem and we will figure it out. Thanks. It sucks though, I have the car all put back together and now the brakes don't work
