[s-cars] A Different Brake Light Question
munrof at sympatico.ca
Sat Jun 27 11:15:58 PDT 2009
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.
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
Subject: [s-cars] A Different Brake Light Question
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
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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