What are the symptoms? Rarely do these go bad but it does happen. Often the check valve goes bad which is an easy repair. A bad engine especially an intake valve can result in poor brake booster operation. How is the mechanic testing it? 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Thursday, September 18, 2014 7:52 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Brake Booster - 1991 Carat

My brake booster is dead - or so says the mechanic. A boosteris near $450 and List Vendors only sell new ones.

I'm not convinced its leaking but don't knw enough about them to know. I do know its a big job to change one out.

Is there any thing that should be checked before undertaking this? I really hate this.

Mechanic says it has a vacuum leak.

Thanks.

John