[s-cars] A Different Brake Light Question

[Douglas Fifield]

Can anyone give me the location of the pressure sensor?

On Sat, Jun 27, 2009 at 7:10 PM, <racingiron at comcast.net> wrote:
> In addition to Fred's points below, it could also be a flaky pressure
> sensor.
>
> If high load steering and emergency braking (with and without engine
> running) are operating properly you might be able to just live with the long
> light after startup.  If the light doesn't go out, I'd start by jumpering
> the various sensors to see which one is complaining, then decide if it's
> worth swapping parts to resolve.
>
> Eric R.
> '86 urq
> '92 urS
> '93 urS
>
> ----- Original Message -----
> From: "Fred Munro" <munrof at sympatico.ca>
> To: "Douglas Fifield" <douglas.fifield at gmail.com>, "Scarlist"
> <s-car-list at audifans.com>
> Sent: Saturday, June 27, 2009 2:15:58 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [s-cars] A Different Brake Light Question
>
> Douglas;
>
> If the light doesn't go off and the reservoir is full, it means that the
> brake assist system isn't coming up to pressure. This could be:
> 1. bad pump
> 2. leaking brake servo
> 3. leaking "bomb" bypass valve
>
> It could also be a flaky reservoir level sensor or emergency brake sensor,
> but that doesn't sound likely from your description of the symptoms.
>
> Fred Munro
> '97 S6
>
>
>
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Douglas Fifield
> Sent: June 27, 2009 1:40 PM
> To: Scarlist
> Subject: [s-cars] A Different Brake Light Question
>
> Gents,
>
> I also am having brake light problems.  Patient is a 95.5 S6 Avant
> with about 140K miles on the clock.
>
> Symptom is a brake light that stays on too long when cold starting and
> sometimes does not go off at all when engine is fully warmed in hot
> weather.
>
> Pentosin reservoir is full (even a little over) when engine is
> running.  Braking feels normal - no pulsing of the pedal.  With engine
> off, I got about thirty pumps of the pedal before it went hard.
>
> I replaced the brake servo two years ago with a new unit.
>
> I was leaning toward a bad bomb before doing the pump-down test.
> What's left?  The pump?
>
> Looking for wisdom in Minnesota.
>
> --
> Douglas in MN
> 95.5 Audi S//6 Avant
> 73 BMW R60/5 mit Toaster Tank
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-- 
Douglas in MN
95.5 Audi S//6 Avant
73 BMW R60/5 mit Toaster Tank