1989 Golf - vacuum leak in a check valve?

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Daytona - 30 May 2004 11:22 GMT

Hi

I've been reading through some of the previous posts which have
enabled me to trace a problem with the brake servo and rough running
on my '89 Golf. Thanks !

The clutch cable has worn through a blanking cap on a unused spare
feed on what looks like a check valve in the vacuum line to the brake
servo.

Plugging the hole under the blanking cap cures the problem.

Does anyone know what this 'check valve' is, what it does and a part
number ? Or pointers to a relevent website.

Thanks

John

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Randolph - 30 May 2004 21:09 GMT

> Does anyone know what this 'check valve' is,

Spot on, it is indeed a check valve.

> what it does

The brake booster operate from engine vacuum. Problem is, engine vacuum
varies quite a bit. On wide open throttle there is very little vacuum,
when the engine is off there is none whatsoever. The check valve is
there to make sure air does not leak into the booster when there is
little or no engine vacuum, i.e. it maintains a vacuum in the booster.

> and a part number ? Or pointers to a relevent website.

That part is probably cheap enough that you can get it at the dealer
without breaking the bank. The parts guy at my dealership is more than
happy to come out and peek under the hood if he can't easily find the
part on ETKA.

Another alternative is the junk yard. Don't restrict your search to A2
Golfs, with that type of fairly generic you should look under the hood
of any VW or Audi you can find, regardless of vintage.

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Daytona - 31 May 2004 15:40 GMT

>> Does anyone know what this 'check valve' is,
>
>Spot on, it is indeed a check valve.

Thanks Randolph !

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