[BiturboS4] Brake Fluid

[Michael Kuriger]

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I only use DOT 5 in my racing applications.  I change the fluid every 6
months to flush out any moisture that might build up.  I haven't seen
any moisture yet in the past 5 or 6 years, but I live in southern cali
where there is not much rain or humidity.  DOT 5 works better, makes the
rubber parts last longer and it's non toxic so that's a plus.  Just
don't mix it with DOT 3 or 4 and if you convert to DOT 5 you have to
first flush the system really well.  the boiling point is over 500
degrees with DOT 5 so that's why I use it for racing.

Ian Duff wrote:

>The critical points are wet boiling point, and DOT number. DOT 3 or DOT 4 is
>what you want, and NOT DOT 5. www.howstuffworks.com/question451.htm. DOT 5
>is typically used in cars that see infrequent use, such as show cars, and is
>formulated to not absorb water. It is silicone-based, to achieve this
>resistance to water absorption. DOT 3/4 fluid is hygroscopic, which means it
>absorbs water over time, hence the measurement of its wety boiling point.
>Being hygroscopic also makes it unsuitable for cars subject to prolonged
>inactivity. DOT 3/4 is what is traditionally used in street cars subjected
>to track conditions. Race use is usually DOT 4, but with a focus on dry
>boiling point, since racers typically change brake fluid as frequently as
>they change tires.
>
>Motul 600 is an excellent DOT 4 brake fluid, with a wet boiling point of
>421oF. Other popular DOT 4 choices include ATE Super Blue and ATE Type 200
>Gold, wet boiling point of 392oF, identical except for color, makes flushes
>easy. Ford Motorsport makes a popular DOT 3 High Performance Brake Fluid,
>with a wet boiling point of 401oF. Folklorre has it that these four are the
>best from which to choose. I'm sure there are others of similar quality, I
>just don't yet know of them, nor of their suitability. HTH.
>
>-Ian Duff.
>-----Original Message-----
>From: biturbos4-admin at audifans.com
>[mailto:biturbos4-admin at audifans.com]On Behalf Of Ti Kan
>Sent: Friday, 28 March 2003 11:43
>To: Step88
>Cc: biturbos4 at audifans.com
>Subject: Re: [BiturboS4] Brake Fluid
>
>
>Step88 writes:
>
>
>>I'm getting ready to change the brake fluid in my S4 and I want to make
>>
>>
>sur=
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>>e I get the right stuff.  I've heard that the stock fluid doesn't hold up
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>w=
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>>ell on the track and should therefore upgrade to something like Motul 600.
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>=
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>> I've also read that they are not recommended to replace silicone based
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>flu=
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>>ids, but I can't determine if the stock fluid is silicone based.  Can
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>someo=
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>>ne tell me if Motul 600 is compatible with the S4 system?  They also
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>appear=
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>> to have a couple of different kinds.  Any experience with any of them?
>>
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>
>I don't have any personal experience on the Motul so I can't comment,
>but the factory fluid is certainly not silicone-based.  You should not
>use any silicone-based fluids in these cars.
>
>-Ti
>2003 A4 1.8T multitronic
>2001 S4 biturbo 6-sp
>1984 5000S turbo
>1980 4000 2.0 5-sp
>--
>    ///  Ti Kan                Vorsprung durch Technik
>   ///   AMB Laboratories, Sunnyvale, CA. USA
>  ///    ti at amb.org
> //////  http://www.amb.org/ti/
>///
>
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