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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