[Vwdiesel] Brakes Vacuum Pump Servo

[d d]

Bob,

Try replacing the line that goes to the vacuum pump.

Has your pump been rebuilt?
If not, try a rebuild kit - that will replace the rubber gaskets.  The old
pumps work fine when rebuilt - no need for the newer style $200-plus
retrofitted vacuum pumps.

If you have a new (old style or new style)/ rebuilt pump and the vacuum
line is good - then you may have a bad servo.

Hope this helps,
Dave





On Sun, Sep 23, 2012 at 3:00 PM, <vwdiesel-request at vwfans.com> wrote:

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>    1. brake servo (Dianne Roa)
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> Message: 1
> Date: Sun, 23 Sep 2012 13:22:38 -0400
> From: Dianne Roa <dianneroa at gmail.com>
> To: vwdiesel at vwfans.com
> Subject: [Vwdiesel] brake servo
> Message-ID:
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> CAFdje1ou1aoqQhj4qXK8SRNFtF8pg1e_4kGi73xM0hL+KObTJw at mail.gmail.com>
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> I have a 1984 VW Rabbit *diesel*.  When I push the brake pedal down, there
> is a hissing sound.  The first time I push the pedal down, the brakes work
> fine.  If I pump the brakes several times, the vacuum assist from the brake
> servo goes away.  I put a vacuum pump on the brake servo input.  I created
> a vacuum on the brake servo and it gradually leaks down.  Also when I put
> the vacuum on the servo I can hear a slight leaking sound.  If I put the
> vacuum on the servo as soon as I push the pedal down it goes to zero.  I am
> not absolutely sure if the problem is with the servo or the vacuum pump.
>
> Bob Roa
>
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> End of Vwdiesel Digest, Vol 107, Issue 13
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