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DOT4 has a higher boiling point than DOT3, DOT5.1 has a higher boiling
point than DOT4 about the same as DOT5 and LMA. It's said that there is
more involved than just flushing when you switch between DOT5 and any of
the others, it can sludge if any remains and they mix. DOT5 doesn't
harm paint like the other three do, but instead of absorbing water it
absorbs air and can make for a spongy pedal. The same amount of water
gets into a DOT5 system as any of the others because the cap is vented
and draws in what could be moisture-laden air as the system cools down.Â
But instead of being absorbed and so removed when you replace the fluid
in DOT3/4/5.1 systems it can remain in the system and if it gets to the
calipers can boil. I remember reading a piece from the American
military some time ago asking the SAE to investigate replacing DOT5 with
other fluids without having to replace the complete braking system.
PaulH.
On 30/08/2023 19:08, wkilleffer@epbfi.com wrote:
> For whatever reason, my memory isn't always spot-on, but I'm pretty
> sure I was using DOT 3 with the previous clutch hydraulics, so that's
> likely to be what I use moving forward. Once I get it disassembled,
> I'm going to blow compressed air through the metal line to clear out
> any old fluid. Never used DOT 5. Understand it has some good qualities
> along with more than a few drawbacks.
>
> About six months ago, I bled the clutch system til clear fluid ran
> out. The fluid that came out at first was black. I didn't think I was
> having that much trouble, so after bleeding, I put it all back
> together. Now, everything seems to point of it suffering a failure
> somewhere along the fluid pathway, so changing all the components will
> at least let me know how old everything is because I'll write it down
> in the maintenance notebook.
>
> Thank you,
>
> -William
>
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<p>DOT4 has a higher boiling point than DOT3, DOT5.1 has a higher
boiling point than DOT4 about the same as DOT5 and LMA. It's said
that there is more involved than just flushing when you switch
between DOT5 and any of the others, it can sludge if any remains
and they mix. DOT5 doesn't harm paint like the other three do,
but instead of absorbing water it absorbs air and can make for a
spongy pedal. The same amount of water gets into a DOT5 system as
any of the others because the cap is vented and draws in what
could be moisture-laden air as the system cools down. But instead
of being absorbed and so removed when you replace the fluid in
DOT3/4/5.1 systems it can remain in the system and if it gets to
the calipers can boil. I remember reading a piece from the
American military some time ago asking the SAE to investigate
replacing DOT5 with other fluids without having to replace the
complete braking system.</p>
<p>PaulH.<br>
</p>
<div class="moz-cite-prefix">On 30/08/2023 19:08,
<a class="moz-txt-link-abbreviated"
href="mailto:wkilleffer@epbfi.com";>wkilleffer@epbfi.com</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:333327821.82040332.1693418920077.JavaMail.zimbra@epbfi.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div style="font-family: arial, helvetica, sans-serif; font-size:
12pt; color: #000000">
<div>For whatever reason, my memory isn't always spot-on, but
I'm pretty sure I was using DOT 3 with the previous clutch
hydraulics, so that's likely to be what I use moving forward.
Once I get it disassembled, I'm going to blow compressed air
through the metal line to clear out any old fluid. Never used
DOT 5. Understand it has some good qualities along with more
than a few drawbacks.</div>
<div><br data-mce-bogus="1">
</div>
<div>About six months ago, I bled the clutch system til clear
fluid ran out. The fluid that came out at first was black. I
didn't think I was having that much trouble, so after
bleeding, I put it all back together. Now, everything seems to
point of it suffering a failure somewhere along the fluid
pathway, so changing all the components will at least let me
know how old everything is because I'll write it down in the
maintenance notebook.</div>
<div><br data-mce-bogus="1">
</div>
<div>Thank you,</div>
<div><br data-mce-bogus="1">
</div>
<div>-William</div>
<br>
</div>
</blockquote>
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