less water absorption is a negative???
And----my pedals are in no way spongy. Sorry to defend DOT 5 so strongly, but
seems everything I hear bad about it has not happened to me in a very long time
of silicone use.
---- Oudesluys <coudesluijs@chello.nl> wrote:
=============
Although DOT5 has its advantages in:
-not stripping paint like DOT3/4 (I do not know if this also true for
DOT5.1)
-less detoriation being not or less hygroscopic
-higher dry and wet boiling point
-long life
there are also some negative sides to it:
-little or no water absorpsion
-slightly spongy brake pedal, hence the recommendation to use Teflon
SS-braided brake hoses.
You will always get some condensation in the brake fluid reservoir and
the fluid will also absorb water from the air, even right through the
seals. With DOT5 this is to a far lesser degree and eventually water can
end up as droplets in the lower regions of the brake system, often in
the callipers or brake cilinders, causing havoc. Because of the
durability of DOT5 most people tend not to change the fluid regularly,
thus the water will not be expelled from the system and this will be the
cause of corrosion in the end.
DOT3, DOT4 or DOT5.1 is less compressible than DOT5 and will absorb the
moisture thus preventing corrosion to a certain point but also the
boiling point will be getting to low. That is the reason it should be
replaced every 1-3 years, depending on conditions.
You can mix DOT4 and 5.1 with DOT3, but you should never top up DOT4
with DOT3 or DOT5.1 with DOT4/DOT3.
You cannot mix DOT5 with DOT3/4/5.1.
There is also DOT6 but that is for militairy applications only.
I know of a lot of people preferring DOT5. I prefer DOT 4 or 5.1 because
of its incompressability and water absoption as I am living in a country
with often a high humidity. I change the brake fluid in all my cars
every 2 years.
Kees Oudesluijs
NL
> Since I can only recommend to use DOT5. Its the best I have ever done as
> brakes are concerned. No mess with leaking and paint eating brake fluid
> anymore.
>
> Josef Eckert
> Konigswinter/Germany
>
Betreff: [Healeys] Silicone DOT5 brakefluid for the 100
> Some years ago there was a discussion whether to use DOT 5 brake fluid in the
> 100 or not. As far as I understand you should make some modifications to the
> brake master cylinder when using DOT 5 fluid. Can anybody tell me precisely
> what these modifications were?.
>
> Thomas Willig
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