[s-cars] A Different Brake Light Question

[racingiron at comcast.net]

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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