From: Ed Ruiz [eds928gt@yahoo.com]
Sent: Wednesday, August 09, 2000 10:50 PM
To: 928
Subject: [928] Re: Silicone brake fluid

First, it is totally incompatible with the regular brake fluid.  The old
fluid must be COMPLETELY flushed from the brake system (every drop) before
the DOT 5 Silicone fluid can be added.

Second, even when the job is done perfectly, silicone fluid is
compressible, which will yield a spongy brake pedal.  For most folks, that
doesn't exude great confidence in the system.  People tend to like and
expect a firm brake pedal.

Third, there are several very good DOT 4 brake fluid brands available. 
ATE Super Blue Racing Fluid is one that has a boiling point of 536 degrees F.
There are other (more expensive) brands that have a higher boiling
point.

Fourth, flushing the system every two years is really no big deal. 
Because I do DE and AX, I flush it every 6 months.  YMMV.

~ Merry motoring ~



-----Original Message-----
From: Wally Plumley [mailto:wplumley@bellsouth.net]
Sent: Saturday, February 09, 2002 11:23 PM
To: 928
Subject: [928] Re: timing belts etc


As Luke said, what we have here is a failure to communicate.

Synthetic brake fluid is not silicone brake fluid.

From Valvoline:

     High Performance Synthetic Brake Fluid

     Recommended for all ABS, hydraulic drum and disc braking
     systems and hydraulic clutches requiring DOT 3 and DOT 4
     fluids. Its premium, synthetic, low moisture formulation provides
     superior anti-vapor lock protection. SynPower High Performance
     Brake Fluid has a high dry-boiling point of 513°F that reduces
     the risk of fluid vaporization and possible brake failure. Wet
     boiling point is 333°F. Meets and exceeds specifications SAE
     J1703, FMVSS No. 116. Surpasses Federal Motor Vehicle
     DOT 4 requirements. Mixes with conventional brake fluids.

The Valvoline synthetic is just standard brake fluid where the chemists 
have modified the glycol molecules to get a little higher wet and dry 
boiling points - I suspect that the ATE wizards did the same thing with 
their fluid.

No problem with using synthetic brake fluid. I agree with Ed that you 
should NOT use silicone fluid in the 928.

Wally Plumley
928 Specialists




-----Original Message-----
From: Thilo Corts [mailto:corts@webx.de]
Sent: Sunday, February 10, 2002 10:28 AM
To: 928
Subject: [928] Re: Synthetic brake fluid [was:timing belts etc]


Ed, Wally, et al.,

One thing that adds to confusion about these fluids is that the
silicone fluid is designated DOT 5 and the synthetic, non-silicone
fluid is designated DOT 5.1. Very unfortunate.

I have been using DOT 5.1 fluid in my Ducati's brake system for years
and find it performs extremely well, especially on the race track.

Best regards

 Thilo




-----Original Message-----
From: PJM2 [mailto:patrick.mcginnis@verizon.net]
Sent: Monday, February 11, 2002 9:29 AM
To: 928
Subject: [928] Brake Fluid


I faxed ATE in Germany last year asking them which fluid they recommend 
for my 89 S4.

Their response was:

Good-DOT 4 SL-Change every year

Better-Super DOT 4-Change every 3 years

Best-Typ 200-Change every 3 years

They aslo sent me this breakdown of the wet & dry boiling point for 
their products:


TYPE-Dry/Wet (celcius)

DOT3-220/150
DOT SL (DOT 4)-265/170
Super DOT 4 (DOT 4)-260/180
Typ 200 (DOT 4)-280/200
Super Blue (DOT 4)-280/200

Type 200 & Super Blue have identical specifications save for the color.

I alternate between these when I flush as it helps ensure you remove all 
of the old fluid.

One other note, the Type SL is available in 1/4 & 1/2 liter cans for 
those of you who don't like to use previously opened  containers.

PJM