Ferrari Mailing List: Re: 328gt4

[LS (lashdeep]

BH is right on the money as usual. Here's a link with a few more brake
fluid comparisons:

http://corner-carvers.com/forums/showthread.php?t=26158&page=2&pp=40&highlight=rear+calipers

I'll add another vote for ATE Super Blue. I recently did a 25 lap stint at
Summit Point in a very heavy street car with no perceptible fluid fade.
And, it's relatively cheap. I've also heard good things about Ford HD.

Good luck with the 328 project...sounds awesome.

LS

--- Dennis Liu <BigHeadDennis [at] earthlink.net> wrote:

> Grahame wrote:
> 
> <description of cool motor transplant snipped>
> 
> >By the way, here is a technical question - anybody using silicon brake
> fluid? What is your experience of this?  
> 
> =================
> 
> Grahame, welcome to the Flist, and please send along a link to some
> photos
> of your baby - quite the feat, it sounds like!  The GT4 is well known
> for
> handling very well (better, arguably, than the 308 successors), so
> stuffing
> the 328 motor in there sounds like the car much just fly now.  Cool!
> 
> Re your brake fluid question:
> 
> In the US, DOT 3, DOT 4 and DOT 5.1 (NOT DOT 5!) brake fluids are
> glycol-based compounds (they are compatible with one another) and are
> "hygroscopic", which means they absorb moisture from the air.
> Formulations
> between DOT 3 and DOT 4 are the same, except boiling points (wet and
> dry)
> are different. DOT 3 is used on a lot of vehicles, as it is somewhat
> cheaper. DOT 5.1 is relatively new, and has higher boiling points, I
> believe.
> 
> DOT 5 (NOT DOT 5.1!) brake fluid is silicone-based, is not hygroscopic,
> and
> should never be mixed with DOT 3, DOT 4 or DOT 5.1. DOT 5.1 has the same
> boiling point as DOT 5, but is not silicone-based. (Interestingly, DOT 5
> fluid will not damage paint.) Restoration shops like to use DOT 5
> because
> the show queens they produce usually just sit, or else are driven on and
> off
> trailers, possibly on nice Sundays. DOT 5 does not need to be changed as
> frequently, because it's not hygroscopic, so it's one less maintenance
> issue
> for them.
> 
> Few (if any) manufacturers today sell cars that come with DOT 5 silicone
> brake fluid (I think Harley Davidson does). The only way to convert to
> silicone is to completely purge the glycol (DOT 3, 4 or 5.1) brake fluid
> from the system. The number one reason NOT to use DOT 5 silicone is
> because
> it can provide a slightly mushy pedal feeling. 
> 
> Which fluid to use, then? Stick with DOT 4, which is what I suspect
> Ferrari
> recommends.
> 
> Overall, Castrol SRF is the best, hands down, but is insanely expensive.
> Ford HD (available from your local dealer) is probably the best value,
> if
> you're a track junkie and are going to be changing the fluid frequently
> (who
> cares what the WET boiling point is if you're changing the fluid before
> every track event?). I personally use ATE Super Blue and Super 200 --
> same
> exact formulation, just different colors. One is blue and the other is
> yellow. This way, when I bleed my brakes, I can better see what is new
> and
> what is old. One can find them for about $12 a can, and I use 1 can per
> change (heck, when I'm bleeding brakes, I flush the fluid entirely, as
> it's
> cheap insurance).
> 
> Here's a chart of Heavy Duty Brake Fluids (www.SeineSystems.com):
> 
> Brand DOT Rating Dry Boiling Wet Boiling
> ----- ---------- ----------- -----------
> AP Racing 550 DOT 3 550°F (287°C) 284°F (140°C)
> AP Racing 600 DOT 3 572°F (300°C) 284°F (140°C)
> (not compatible with other fluids)
> 
> ATE Super Blue DOT 4 536°F (280°C) 382°F (194°C)
> ATE Super 200 DOT 4 536°F (280°C) 382°F (194°C)
> (amber color aka Type 200)
> 
> Bosch DOT 3 DOT 3 491°F (255°C) 288°F (142°C)
> Bosch DOT 4 DOT 4 509°F (265°C) 329°F (165°C)
> Bosch DOT 4+ DOT 4 536°F (280°C) 356°F (180°C)
> Castrol LMA DOT 4 446°F (230°C) 311°F (155°C)
> Castrol SRF DOT 4 590°F (310°C) 518°F (270°C)
> Ford HD DOT 3 550°F (287°C) 284°F (140°C)
> Motul Racing DOT 4 586°F (307°C) 421°F (216°C)
> Brake Fluid 600
> 
> Performance DOT 3 550°F (287°C) 284°F (140°C)
> Friction Z-Rated 
> 
> Wilwood 570 DOT 3 570°F (299°C) 284°F (140°C)
> 
> Minimum spec. for DOT Rating Dry Boiling Wet Boiling 
> DOT 3 401°F 284°F
> DOT 4 446°F 311°F
> DOT 5 500°F 356°F
> 
> 
> Hope this helps!
> 
> Vty,
> 
> --Dennis
> 
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