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When this came round last time, I did a little digging and came up with =
this, which I believe I may have inflicted on you before. It was written =
for our local (UK) club magazine but I=E2=80=99m sure that most of it, =
if not all, is universal. It=E2=80=99s more about what mixes with which =
rather than which rots what. If you get my meaning=E2=80=A6.
1. 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.
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.
Simon
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Bob Spidell
Sent: 16 June 2019 16:34
To: healeys@autox.team.net
Subject: Re: [Healeys] silicone brake fluid
=20
I've used silicone BF in my BJ8 for close to 30 years (and when I =
replaced the brake MC, 15-20 years and 80-100K miles ago, I disregarded =
the same warning). As somebody mentioned, your problem is symptomatic =
of the 'check valve'--aka 'foot valve--malfunctioning or damaged. I had =
similar problem with my brakes on a long road trip; had to pump the =
pedal a couple times on every application (for a couple thousand miles).
We put the highly-touted Castrol BF in our 100M after a thorough =
restoration--with all-new brake system--and the fluid jelled when that =
car sat for a couple years.
Side note: Most BFs are calling themselves 'synthetic' these days. Are =
they a new formulation, or just jumping on the bandwagon as, AFAIK, BF =
has always been synthetic (the glycols used don't occur in nature)?
Bob
=20
On 6/16/2019 7:44 AM, Team.net wrote:
I have used silicone in all my british cars for 25 years with no =
problems
On Jun 16, 2019, at 09:31, HealeyRick <healeyrik@gmail.com =
Apparently, silicone can cause swelling of the seals in Girling and =
Lockheed systems: http://www.gomog.com/brakes.html I have a Howe =
hydraulic clutch in my Nasty Boy, and that also came with the advisory =
not to use silicone fluid. =20
=20
Rick Neville
=20
On Sun, Jun 16, 2019 at 8:24 AM Brian Drab <bgdrab@redzone.ca =
Last week I completed a driving tour in our BJ8. It was a great tour and =
everything ran well except for one thing. 4 or 5 times, when I used the =
clutch, the clutch master cylinder bypassed. The rest of the time it =
worked well. As I don=E2=80=99t want to be caught without a clutch at a =
later date I am changing the clutch master cylinder. I have received a =
replacement and am preparing to install it.
On the box is a quick summary of the bleeding procedure under a warning =
=E2=80=93 =E2=80=9CUsing Silicon Brake fluid will void =
warranty=E2=80=9D. I have used silicon fluid for well over 10 tears and =
never experienced any problems with it and have never seen or heard of =
this type of warning before. I have never heard of any destructive =
qualities of Silicon fluid.=20
My question is =E2=80=93 does anyone have any idea what it is about.=20
For me to change to Dot4 fluid is quite a big deal as I would be =
changing out the clutch as well as the brake system seeing as they share =
a common reservoir.=20
I=E2=80=99d appreciate any comments on the warning.
Brian Drab
BJ8
=20
=20
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</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite =
lang=3DEN-GB link=3Dblue vlink=3Dpurple><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'color:windowtext;mso-fareast-language:EN-US'>When this came =
round last time, I did a little digging and came up with this, which I =
believe I may have inflicted on you before. It was written for our local =
(UK) club magazine but I=E2=80=99m sure that most of it, if not all, is =
universal. It=E2=80=99s more about what mixes with which rather than =
which rots what. If you get my =
meaning=E2=80=A6.<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'><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=3DMsoNormal><span =
style=3D'color:windowtext;mso-fareast-language:EN-US'>Simon<o:p></o:p></s=
pan></p><p class=3DMsoNormal><span =
style=3D'color:windowtext;mso-fareast-language:EN-US'><o:p> </o:p></=
span></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 style=3D'color:windowtext'>From:</span></b><span =
lang=3DEN-US style=3D'color:windowtext'> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bob =
Spidell<br><b>Sent:</b> 16 June 2019 16:34<br><b>To:</b> =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] silicone brake =
fluid<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p>I've used silicone BF in my =
BJ8 for close to 30 years (and when I replaced the brake MC, 15-20 years =
and 80-100K miles ago, I disregarded the same warning). As =
somebody mentioned, your problem is symptomatic of the 'check =
valve'--aka 'foot valve--malfunctioning or damaged. I had similar =
problem with my brakes on a long road trip; had to pump the pedal a =
couple times on every application (for a couple thousand =
miles).<o:p></o:p></p><p>We put the highly-touted Castrol BF in our 100M =
after a thorough restoration--with all-new brake system--and the fluid =
jelled when that car sat for a couple years.<o:p></o:p></p><p>Side note: =
Most BFs are calling themselves 'synthetic' these days. Are they a =
new formulation, or just jumping on the bandwagon as, AFAIK, BF has =
always been synthetic (the glycols used don't occur in =
nature)?<o:p></o:p></p><p>Bob<o:p></o:p></p><p><o:p> </o:p></p><div>=
<p class=3DMsoNormal>On 6/16/2019 7:44 AM, Team.net =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal>I have used silicone in all my british cars for 25 =
years with no problems<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><br>On Jun 16, 2019, at 09:31, HealeyRick =
<<a href=3D"mailto:healeyrik@gmail.com";>healeyrik@gmail.com</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal>Apparently, silicone can cause swelling of the seals =
in Girling and Lockheed systems: <a =
href=3D"http://www.gomog.com/brakes.html";>http://www.gomog.com/brakes.htm=
l</a> I have a Howe hydraulic clutch in my Nasty Boy, and that =
also came with the advisory not to use silicone fluid. =
<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Rick Neville<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Sun, Jun 16, 2019 at 8:24 AM Brian Drab <<a =
href=3D"mailto:bgdrab@redzone.ca";>bgdrab@redzone.ca</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>Last week I completed a driving tour in our BJ8. It was a =
great tour and everything ran well except for one thing. 4 or 5 =
times, when I used the clutch, the clutch master cylinder bypassed. The =
rest of the time it worked well. As I don=E2=80=99t want to be caught =
without a clutch at a later date I am changing the clutch master =
cylinder. I have received a replacement and am preparing to install =
it.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>On the box is a quick summary of the bleeding procedure =
under a warning =E2=80=93 =E2=80=9CUsing Silicon Brake fluid will void =
warranty=E2=80=9D. I have used silicon fluid for well over 10 tears and =
never experienced any problems with it and have never seen or heard of =
this type of warning before. I have never heard of any destructive =
qualities of Silicon fluid. <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>My question is =E2=80=93 does anyone have any idea what it =
is about. <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>For me to change to Dot4 fluid is quite a big deal as I =
would be changing out the clutch as well as the brake system seeing as =
they share a common reservoir. <o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>I=E2=80=99d appreciate any comments on the =
warning.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>Brian Drab<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-CA>BJ8<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA><o:p> </o:p></span></p></div></div></blockquote></div><=
/div></blockquote><pre><o:p> </o:p></pre></blockquote></div></body><=
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