Quote Originally Posted by Daox View Post
This all has to do with vacuum and the brake booster. As soon as the engine starts up you should have vacuum in the brake booster to make everything feel normal. If there is a leak in the booster the pedal will get hard. It will also get hard if you pump it a few times when the engine is off.
Hello, great forum. I recently bought a 2005 and had the exact issue. Spurned like a typical booster problem. I went ahead and replaced it and master cylinder with new OEM unit. 3 days ans almost 500 later, the issue has retuned, I almost rear ended someone today. Same as before.

Any more ideas where to look?