In general, brake boosters do not wear but they fail. They fail in one
of two ways. They either fail to provide assist or worse, become a
massive vacuum leak to the engine. Or they apply so much assist that the
brakes are actually applied with out your foot. The most common failure
is the check valve that hold the vacuum for the booster. One sign of a
problem is the assist increasing when down shifting the van to
decelerate.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Leon Korkin
Sent: Friday, January 25, 2002 12:06 PM
To: vanagon@GERRY.VANAGON.COM
Subject: brake booster

Hello Volks,
Does anibody know enough about brake boosters to answer these...
Do brake boosters wear enough to need replacement? By now mine is 17
years old.
Got booster out of the Vanagon Are there any signs of problems i can
look for? .
Is it possible to check it's function out of the car?
TIA,
Leon Korkin