Fordsport
I am having the same issue, I changed the front calipers,the master and also the booster and still have the same issue. Somebody told me to check the rod length behind the master and it may make sense because I remember when I put the master on it slid on easy like the rod was to short and it wasn`t making contact with the master. I will pull the master off tomorrow and try it. I was also looking at that box mounted to the frame under the air cleaner hoping it`s not that.