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Old 06-20-2005, 12:42 AM   #1
Scooby Specialist
Member#: 3086
Join Date: Nov 2000
Location: Coram LI NY
2001 2.5 RS

Default Brake Booster Check valve

Hello all.

Anyone knows where it is and what its for?
Any pic or diagram would be very helpful.

Thanx a ton.

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Old 06-20-2005, 09:48 AM   #2
Scooby Specialist
Member#: 63076
Join Date: May 2004
Location: Caulifornia
2004 Outback Sport


Its in the vacuum line running to the booster. Its there so that when you go into boost, you don't pressurize and blow up the booster. A good thing to have - if you have a turbo.
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Old 06-20-2005, 03:24 PM   #3
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Scooby Specialist
Member#: 47261
Join Date: Nov 2003
Chapter/Region: W. Canada
Location: Edmonton, Alberta

Actually you wouldn't blow up the booster. I know someone that replaced that vaccuum hose with one without a vaccuum check... all it does is blow air into the cabin behind the brake pedal when you boost.

in case you are wondering, it's a little bulge in the hose going from the intake manifold to the brake booster. It can't be removed or inserted, and it comes in the hose. It is only available through subaru.
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Old 11-10-2009, 08:51 AM   #4
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Member#: 215363
Join Date: Jun 2009
2005 Impreza STi


If something is wrong with this, would it cause an Engine Check light to come up on the dash, with error 'Brake Booster Valve' ?
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