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I made myself some notes which I later submitted to our local AH mag. =
Here=E2=80=99s the gist of them. May have posted this before=E2=80=A6.
=20
1. =E2=80=9CAll brake fluid is =
=E2=80=9Csynthetic=E2=80=9D=E2=80=A6it=E2=80=99s not a =
=E2=80=9Cnatural=E2=80=9D product.
2. Most synthetic fluids are NOT silicone. They are polyethylene glycol =
ether based.
3. DOT 3 & 4, which can be mixed, are not silicone. They are glycol.
4. DOT 5, which cannot be mixed with 3 or 4, is silicone. Can=E2=80=99t =
be mixed with anything!
5. DOT 5.1 is glycol based and cannot be mixed with DOT 5.
6. DOT 5.1 can be mixed with DOT 3 or 4, as both are glycol based.
=20
The word =E2=80=9Csynthetic=E2=80=9D began to appear when manufacturers =
worked out that it made regular brake fluid sound more special ie they =
could charge us more money for the same old stuff.
=20
DOT stands for Dept. Of Transport and relates to the fluids=E2=80=99 =
boiling points. If a car brakes at high speed, the brakes get hot. Some =
heat is carried away from the brakes by the brake fluid. Bad news if the =
fluid boils! The faster you=E2=80=99re going, the higher DOT you need. =
Higher DOT numbers indicate higher boiling points for =
=E2=80=9CDry=E2=80=9D fluid (has not absorbed any water) and =
=E2=80=9CWet=E2=80=9D fluids (has absorbed water). ie, the wetter it is, =
the more problematic it becomes. Mixing 3 with 4 lowers the boiling =
points and vice verca.=E2=80=9D
=20
Simon
=20
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Mark =
Donaldson
Sent: 31 October 2022 22:06
To: 'Bob Spidell' <bspidell@comcast.net>; healeys@autox.team.net
Subject: Re: [Healeys] Brake Fluid
=20
DOT5 and DOT 5.1 are NOT compatible.
=20
I=E2=80=99ve have been using Bel-Ray DOT5 SBF in my BN2 and my tri-carb =
since 1992.
I=E2=80=99ve never had a problem.
=20
Mark
Ardmore, NZ
=20
Sent: Monday, 31 October 2022 5:35 PM
Subject: Re: [Healeys] Brake Fluid
=20
"... There is a newer Glycol Ester DOT5 ..."
I think you're referring to 'DoT5.1' I also think it was deliberately =
named so as to confuse the issue.
On 10/30/2022 8:05 PM, Christopher Moog via Healeys wrote:
I've used both. Currently prefer DOT4.
Also everyone is speaking of DOT5 but there are now two different DOT5s. =
The first is the older silicone based DOT5. There is a newer Glycol =
Ester DOT5 that is compatible with DOT3 and DOT4. It has a lower =
viscosity than the DOT3 and DOT4 so it works better in some ABS systems. =
It also has a higher boiling point than DOT3 and DOT4. Don't see an =
advantage in Healeys.
On 10/30/2022 10:00 PM, Alan Seigrist wrote:
The best selling point for Dot 4 is you can mix any Dot 4 or even Dot 3 =
if you need to fill up. As I understand it with Dot 5 you should be =
careful to always use the same brand to fill up if necessary.
Also, neither Dot 5 not Dot 4 is great for sitting a long time, Dot 4 =
absorbs water, Dot 5 will push any water down into the components.
Dot 4, if the car is not used regularly, needs to be flushed every =
couple of years.
=20
On Mon, Oct 31, 2022 at 5:43 AM Michael MacLean =
At this point in the restoration I have a completely rebuilt brake =
system with all new components and tubing. Now is the time to make the =
decision to use DOT 4 or Silicone. What's the consensus, if there is =
one?
Mike MacLean
=20
=20
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>I made myself some notes which I =
later submitted to our local AH mag. Here=E2=80=99s the gist of them. =
May have posted this before=E2=80=A6.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><ol =
style=3D'margin-top:0cm' start=3D1 type=3D1><li class=3DMsoNoSpacing =
style=3D'mso-list:l0 level1 lfo1'>=E2=80=9C<span =
style=3D'font-family:"Times New Roman",serif'>All brake fluid is =
=E2=80=9Csynthetic=E2=80=9D=E2=80=A6it=E2=80=99s not a =
=E2=80=9Cnatural=E2=80=9D product.<o:p></o:p></span></li><li =
class=3DMsoNoSpacing style=3D'mso-list:l0 level1 lfo1'><span =
style=3D'font-family:"Times New Roman",serif'>Most synthetic fluids are =
NOT silicone. They are <span style=3D'color:#222222'>polyethylene =
<u>glycol</u> ether based.</span><o:p></o:p></span></li><li =
class=3DMsoNoSpacing style=3D'mso-list:l0 level1 lfo1'><span =
style=3D'font-family:"Times New Roman",serif'>DOT 3 & 4, which can =
be mixed, are not silicone. They are glycol.<o:p></o:p></span></li><li =
class=3DMsoNoSpacing style=3D'mso-list:l0 level1 lfo1'><span =
style=3D'font-family:"Times New Roman",serif'>DOT 5, which cannot be =
mixed with 3 or 4, is silicone. Can=E2=80=99t be mixed with =
anything!<o:p></o:p></span></li><li class=3DMsoNoSpacing =
style=3D'mso-list:l0 level1 lfo1'><span style=3D'font-family:"Times New =
Roman",serif'>DOT 5.1 is glycol based and cannot be mixed with DOT =
5.<o:p></o:p></span></li><li class=3DMsoNoSpacing style=3D'mso-list:l0 =
level1 lfo1'><span style=3D'font-family:"Times New Roman",serif'>DOT 5.1 =
can be mixed with DOT 3 or 4, as both are glycol =
based.<o:p></o:p></span></li></ol><p class=3DMsoNoSpacing><span =
style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNoSpacing><span =
style=3D'font-family:"Times New Roman",serif'>The word =
=E2=80=9Csynthetic=E2=80=9D began to appear when manufacturers worked =
out that it made regular brake fluid sound more special ie they could =
charge us more money for the same old stuff.<o:p></o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNoSpacing><span =
style=3D'font-family:"Times New Roman",serif'>DOT stands for =
<b><u>D</u></b>ept. <b><u>O</u></b>f <b><u>T</u></b>ransport and relates =
to the fluids=E2=80=99 boiling points. If a car brakes at high speed, =
the brakes get hot. Some heat is carried away from the brakes by the =
brake fluid. Bad news if the fluid boils! The faster you=E2=80=99re =
going, the higher DOT you need. Higher DOT numbers indicate higher =
boiling points for =E2=80=9CDry=E2=80=9D fluid (has not absorbed any =
water) and =E2=80=9CWet=E2=80=9D fluids (has absorbed water). ie, the =
wetter it is, the more problematic it becomes. Mixing 3 with 4 lowers =
the boiling points and vice verca.=E2=80=9D<o:p></o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><p class=3DMsoNoSpacing><span =
style=3D'font-family:"Times New =
Roman",serif'>Simon<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Mark =
Donaldson<br><b>Sent:</b> 31 October 2022 22:06<br><b>To:</b> 'Bob =
Spidell' <bspidell@comcast.net>; =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Brake =
Fluid<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><span =
lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'>DOT5 and DOT 5.1 are <b>NOT</b> =
compatible.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'>I=E2=80=99ve have been using Bel-Ray DOT5 SBF in my BN2 and my =
tri-carb since 1992.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'>I=E2=80=99ve never had a problem.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'>Mark<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-NZ =
style=3D'font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-langua=
ge:EN-US'>Ardmore, NZ<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-NZ =
style=3D'color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></spa=
n></p><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Bob Spidell <<a =
href=3D"mailto:bspidell@comcast.net";>bspidell@comcast.net</a>> =
<br><b>Sent:</b> Monday, 31 October 2022 5:35 PM<br><b>To:</b> <a =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a><br><b>S=
ubject:</b> Re: [Healeys] Brake =
Fluid<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-NZ><o:p> </o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-NZ>"... There is a =
newer Glycol Ester DOT5 ..."<br><br>I think you're referring to =
'DoT5.1' I also think it was deliberately named so as to confuse =
the issue.<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-NZ>On 10/30/2022 8:05 PM, Christopher Moog via Healeys =
wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-NZ>I've used both. =
Currently prefer DOT4.<br><br>Also everyone is speaking of DOT5 but =
there are now two different DOT5s. The first is the older silicone based =
DOT5. There is a newer Glycol Ester DOT5 that is compatible with DOT3 =
and DOT4. It has a lower viscosity than the DOT3 and DOT4 so it works =
better in some ABS systems. It also has a higher boiling point than DOT3 =
and DOT4. Don't see an advantage in =
Healeys.<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-NZ>On 10/30/2022 10:00 PM, Alan Seigrist =
wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-NZ>The best selling point =
for Dot 4 is you can mix any Dot 4 or even Dot 3 if you need to fill =
up. As I understand it with Dot 5 you should be careful to always =
use the same brand to fill up if necessary.<br><br>Also, neither Dot 5 =
not Dot 4 is great for sitting a long time, Dot 4 absorbs water, Dot 5 =
will push any water down into the components.<br><br>Dot 4, if the car =
is not used regularly, needs to be flushed every couple of =
years.<o:p></o:p></span></p></div><p class=3DMsoNormal><span =
lang=3DEN-NZ><o:p> </o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-NZ>On Mon, Oct 31, 2022 at 5:43 AM =
Michael MacLean <<a =
href=3D"mailto:springer.mike51@gmail.com";>springer.mike51@gmail.com</a>&g=
t; wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5=
.0pt'><div><div><p class=3DMsoNormal><span lang=3DEN-NZ>At this point in =
the restoration I have a completely rebuilt brake system with all new =
components and tubing. Now is the time to make the decision to use =
DOT 4 or Silicone. What's the consensus, if there is =
one?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-NZ>Mike MacLean<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span =
lang=3DEN-NZ><o:p> </o:p></span></p></blockquote></div></blockquote>=
</blockquote><p class=3DMsoNormal><span =
lang=3DEN-NZ><o:p> </o:p></span></p></div></body></html>
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