Quote Originally Posted by oj88 View Post
I suggest you take to your trusted mechanic. Make sure to mention that it is vacuum and/or brake booster related.

Things to check would be:

1. Vacuum pump (assuming that it's a Diesel), which is typically piggy-backed to the alternator. It might be failing.
2. Vacuum pipes/hoses. Check for leaks
3. Failing vacuum check-valve. It may be installed somewhere along the vacuum lines between the pump and the brake booster
4. Brake booster/HydroVac. It could be leaking as well
Ok Sir I'll Take your advice. and thanks a lot.