I rebuilt the vacuum pump for our diesel and have great results. The symptoms came on gradually in our case, first with a slow shut down, then slower door locks. I waited until it affected the brake booster, which was way too late.

During the rebuild it was evident the problem was a torn diaphragm that probably started small and manifested itself greater as time passed. The rebuild kit was an M-B kit that addressed all the removable parts. In our case the bearing was not an issue.

Jim W.