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The Audi 5000 engine uses a vacuum pump that is bolted to the end of the cyl head to provide vacuum for the brake booster, this is driven by a belt. The problem is that it makes the engine longer and in order to set or check the injection pump timing, the pulley and belt have to be removed.VW uses a diaphragm pump on the Eurovan diesels and it is run by a push rod that rides on a cam lobe. The whole pump is bolted to the side of the cyl head between the injectors.I drilled all the mounting and push rod holes. So I got rid of a belt and ended up with more space in the engine compartment.