Clyde

Brake vacuum pump..2005 2.8CRD Auto Grand Voyager brake vacuum issue. Can anyone help please? I have changed the servo and the vacuum is still low on the brakes. They work ok once but then need standing on to stop. Changing the servo wasn't half as hard as the internet will tell you though, so that was good! I do have vacuum from the vacuum pipe but maybe not enough. Is it a big job to replace the vacuum pump on the front of the engine?