[s-cars] Brake fluid on driver's feet

[John Cody Forbes]

For archive sake can we clarify some things here?

What fluid is leaking on the floor, brake fluid (the clear/yellow stuff that eats paint), or brake booster fluid / central hydraulic fluid (the green CHF stuff made by Pentosin)? Using "Pentosin" as a product name doesn't help because that company makes many fluids that go in our cars (engine oil, coolant, brake fluid, power steering fluid (in the cars with vacuum boosters), and central hydraulic fluid).

Also, there simply is no part on any modern Audi called a brake slave cylinder. The bit bolted to the fire wall that the brake pedal acts upon is the brake master cylinder. Think of it this way; there is the one master who forces the calipers (the "slaves") to do the braking work for him. In the old days of drum brakes cars did have brake slave cylinders (aka wheel cylinders), but they are long gone and have given way to disc brake calipers. The bit under the dash that the clutch pedal acts upon is the clutch master cylinder. Again, the clutch master has the clutch slave (on the bell housing) do the clutch operation for him, hence the master and slave terminology.


If you do indeed have brake fluid

-Cody (mobile)

On Sep 10, 2010, at 6:45 PM, "P. Dooley" <weski at verizon.net> wrote:

>  I think we have a winner.  Pulled lower driver side dash apart and 
> found Pentosin on the brake slave cylinder as Michael suggested (and I 
> had to wait a whole 7 minutes to get this answer - this list is great).
> 
> I had replaced the master cylinder a year or so ago.  Guess I'll think 
> about doing the clutch while I'm in there as suggested.  Hope it gets me 
> to the airport tomorrow and back in 2 weeks if I add fluid .  Better put 
> some plastic down so my carpet doesn't get soaked while I'm away too.
> 
> Paul
> 
> On 9/10/2010 5:47 PM, Michael Lardizabal wrote:
>> Paul- thats the dreaded brake slave cylinder assy thats given way to 
>> wear. On QW there are threads pertaining to a recent DIY. Owner did a 
>> R&R while upside down on the drivers seat.
>> 
>> PITA, but doable.
>> 
>> Brad ( Thetatau78 ) has an entire cltch/brk pedal assy for sale that I 
>> passed on at SFest. Maybe he'll chime in.
>> 
>> GL.
>> 
>> PS- might as well change the clutch one while you're down there.
>> ------------------------------------------------------------------------
>> *From:* P. Dooley <weski at verizon.net>
>> *To:* Scar <s-car-list at audifans.com>
>> *Sent:* Fri, September 10, 2010 5:40:50 PM
>> *Subject:* [s-cars] Brake fluid on driver's feet
>> 
>>  S-Wisdom,
>> 
>> Patient is a 95 S6 that has dripped most of the brake fluid reservoir
>> into the driver's feet and carpet.  Seems to have started just this week
>> (I noticed the toes of my left brown shoe was dark like it was wet but
>> it hadn't rained in a few days).  Today when I had a chance to look at
>> it in the day light, I could see what looked like wet carpet but it
>> didn't feel like water - Pentosin it was.  Red brake light came on
>> Wednesday night too.  The reservoir is almost empty.
>> 
>> What is the likely culprit?  Nope, haven't pulled codes but I'm heading
>> that way next.
>> 
>> Paul Dooley
>> 95 S6
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