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How imperative is a brake vacuum pump replacement? What is this? on 2006 Volkswagen Jetta

I recently had my car inspected and was told (with great urgency) that this needs to be replaced. I was also given an estimate of $738. My car currently has no symptoms of an issue.

Asked by for the 2006 Volkswagen Jetta
That is what helps you apply the brakes. If it goes then you will start to get a very stiff brake pedal make for difficult braking. Anything on a VW is difficult so I would say might be serious.