It doesn't appear that anyone has reported this issue on the forum...wondering if it's only me? For the last 3 weeks, when I get into the Jeep after it's been sitting a few hours, the brake pedal is VERY stiff. It's like you pumped it while the car was off is the only way I can describe it. As soon as it start up, all is fine. I have 4000 miles on it and it just started happening. Its clockwork the last 3 weeks and when my service appointment finally came OF COURSE the damn thing was fine (so they reported). I did go over and check it myself because they claimed they were driving it and I made clear the issue can be noticed only before startup. I made mention that my very limited research pointed to the brake booster or a vacuum leak but that's just a guess from my Google searches. So, needless to say, I got the car home and it immediately behaved abnormally BUT it did have a couple instances where it worked as expected. So not sure - these intermittent things make me crazy. Tonight when I pulled it into the garage, I notice that after I depressed the brake and let off - there was a strange noise for about 15-20 seconds. Not sure what that was but it seems to be reproducible so if nothing else I'll bring it back this week and ask what that noise is because I never heard that before. Anyone have thoughts on what this could be? THANKS MUCH!