[s-cars] A Different Brake Light Question

[Fred Munro]

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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