I don't know, but that is what I saw. I would not know how much natural rubber
is on our cars or how to tell but someone with more old brit car experience
would have to chime in. I would not imagine it to be a problem for any later
model or aftermarket stuff. The wilwood calipers came with a warning that said
use you may be killed if you don't set up your brakes correctly, ignoring that
it said use DOT3 or DOT4 fluids. Another thing to look for is the WET boiling
point, while some of the Hi-Temp ones are good with no moisture in the mix,
they are not too good with it, and that is the normal operating conditing from
what it seems like. Lots of interesting reading on the web. But it's pretty
clear that Silicone is not something that should be used unless you have
specific reasons to do it.
Sandy
----- Original Message ----
From: James E.
Pickard <geowiz.sgy@cox.net>
To: Sandy Ganz <sganz@pacbell.net>;
tigers@autox.team.net
Sent: Sunday, June 14, 2009 2:02:39 PM
Subject: Re:
[Tigers] brake fluid
I thought you were supposed to use DOT 3 in Tigers
because of the natural rubber. According to this, you should use DOT 4. Am I
reading this wrong?
Jim Pickard
B9473298 ('65 Tiger)
AN5L/12109 ('59 Sprite)
- sold
2003 Mini Cooper
Lafayette, LA
----- Original Message ----- From:
"Sandy Ganz" <sganz@pacbell.net>
To: <tigers@autox.team.net>
Sent: Sunday,
June 14, 2009 12:07 AM
Subject: Re: [Tigers] brake fluid
> My understanding
was Dot 3 and Dot 4 (and it seems Dot 5.1 as in five point
> one) are
compatible. But some differences on what I found below was
> interesting. I
have run Motul RBF600 in a few cars and had good results with
> it, also ran
it in an external clutch slave in the Mustang, and running it in
> the Tilton
Hydro-TRB in the Cobra. The Cobra has not been in use yet so hard
> to say if
it would have any effect, but I would expect it not to have any
> natural
rubber seals, which might be more common on older british stuff.
> <stolen
from a discussion found on the web that seemed credible>
>
> DOT3: Brake
>
Fluid Grade - Min dry boiling pt =205degC or 401degF. Min wet
> boiling pt =
> 140degC or 284degF. aliphatic polyether-based, can be mixed
> with DOT4,
>
characteristics will be (linearly) in between DOT3/DOt4
> parameters. Cheap,
>
most widely used, eats paint, absorbs water easily, eats
> natural rubber
seals.
> DOT4: Brake Fluid Grade - Min dry boiling pt=230degC or 446degreesF.
Min
> wet
> boiling pt = 155degC or 311degreesF. borate ester based, can be
mixed
> with
> DOT3, characteristics will be (linearly) in between DOT3/DOT4
>
parameters, 50%
> more expensive than DOT3, eats paint, significantly
>
increased resistance to
> moisture absorption compared to DOT3 (but still
>
absorbs water), does not eat
> natural rubber seals.
>
> DOT5.1: Brake Fluid
Grade - Min dry boiling pt=260degC
> or 500degF. Min wet
> boiling pt =
180degC or 356degF. It's a stupid name as
> it's glycol-based
> (borate ester)
like DOT3/4 and has NO silicone. Absorbs
> water, eats paint,
> more
expensive than DOT4, difficult to locate.
>
> DOT5: Brake
> Fluid Grade - Min
dry boiling pt=260degC or 500degF. Min wet
> boiling pt =
> 180degC or
356degF. Cannot mix with other fluids as it
> contains silicone,
> turns to
jelly if done so; colored purple. Used mostly
> for antique cars and
> some
motorcycles because it does not damage paint and
> does not absorb water
> (it
allows water to pool in the low parts of the
> braking system). Is more
>
compressible than DOT3/4 though. Twice as
> expensive as DOT4 (and thus 3
times
> as expensive as DOT3) and has limited
> availability.
>
> Sandy
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