I have a2009 wrangler with 101,000 miles. I bought it three months ago. This has now happened to me twice now where i lose brake pressure. The first time it happened I ran over a couple of these nice sized lane devider things. They were pretty good sized too and then today I hit a decent sized pothole. Once I lose pressure the pedal goes to the floor when I barely apply pressure. I have to pump the brakes to build the pressure back up. Anyone know what could be the issue. Thanks in advance.