My'79 300SD has a different type vacuum pump. It sort of looks like an 1/2 of an electric motor molded into the cover. It says "A. Pierberg" on the pump.

I have noticed times of low vacuum lately, I.E. hard brakes and longer engine shut off but the vacuum door locks work fine even days later after engine was run.

Is this vacuum pump rebuildable should I need to? Are kits available to rebuild it?

P E H