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Well Phil,=20
it is an engineering thing called =E2=80=9Cminimum standards=E2=80=9D =
because when hydraulicly actuated brakes were first designed, anyone =
would put literally any liquid from boiled horse piss to castor oil in =
the hydraulic system without regard to cause and effect, and that of =
course caused people to get injured or die or cause major property =
damage when the brake line failed or the fluid boiled. So much so that =
the government had to step in and regulate the automotive industry and =
establish minimum standards.
=20
DOT numbers typically reflect changes in the minimum standards.
=20
When you buy fluids for a =E2=80=9Cmodern=E2=80=9D car (mid 60=E2=80=99s =
onward), they specify the SAE standard number with its quoted release =
date.
It is the same for motor oil. Most people buy their motor oil by the =
brand and viscosity rating like Valvoline 10W30 or Castrol 20W50, but =
the way people should buy their Motor oil is by the SAE specification, =
SAE Service range and equipment ambient temperature operating ranges as =
established by the vehicle manufacturer, and as stated in the =
owner=E2=80=99s manuals and TSB updates from the manufacturer.=20
=20
So when people argue about which brake fluid or motor oil is better, =
=E2=80=9Cbetter=E2=80=9D is a relative term. Each J170x standard =
represents improvements in the brake fluid formulations mostly designed =
for higher boiling temperatures and more consistent viscosity to reduce =
the potential of cavitation.
=20
DOT 4 was created to reduce the potential of the fluid to cavitate when =
passing through a rapidly stroking valve in the ABS system.
=20
For an LBC, my experience is either use Castrol LMA DOT3 Crimson, or =
DOT5, because you do simply do not know what the seals in the system are =
made of and those two fluids seem to not cause seal deterioration of =
seals made of a wide range of rubber materials =E2=80=93 in my =
experience. =20
My personal preference is DOT 5 (purple) because it does not eat my =
paint, I know it will not react with my seals, it has a higher boiling =
temperature than DOT 3, and is not hygroscopic which would cause water =
to pool at the system low points right at the seal to metal location and =
cause corrosion.
=20
Let the =E2=80=9Cfluif=E2=80=9D arguments continue!
=20
Glenn aka StagByTriumph Garage
=20
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Philip =
Ethier
Sent: Saturday, April 29, 2023 2:09 PM
To: Don Hiscock <don.hiscock@gmail.com>
Cc: triumphs@autox.team.net; Joel Justin <j_bar_j@hotmail.com>
Subject: Re: [TR] Dot 5 brake fluid
=20
=20
=20
On Thu, Apr 27, 2023 at 3:32=E2=80=AFPM Don Hiscock =
The nomenclature around DOT5 (silicone) and DOT5.1 (glycol) never made =
any sense to me...
=20
The stupidest decision imaginable. Why not DOT6? Or DOT4.1? Just =
ridiculous.=20
=20
=20
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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>Well Phil, <o:p></o:p></p><p =
class=3DMsoNormal>it is an engineering thing called =E2=80=9Cminimum =
standards=E2=80=9D because when hydraulicly actuated brakes were first =
designed, anyone would put literally any liquid from boiled horse piss =
to castor oil in the hydraulic system without regard to cause and =
effect, and that of course caused people to get injured or die or cause =
major property damage when the brake line failed or the fluid =
boiled.=C2=A0 So much so that the government had to step in and regulate =
the automotive industry and establish minimum =
standards.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>DOT numbers typically reflect changes in the minimum =
standards.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>When you buy fluids for a =E2=80=9Cmodern=E2=80=9D car =
(mid 60=E2=80=99s onward), they specify the SAE standard number with its =
quoted release date.<o:p></o:p></p><p class=3DMsoNormal>It is the same =
for motor oil.=C2=A0 Most people buy their motor oil by the brand and =
viscosity rating like Valvoline 10W30 or Castrol 20W50, but the way =
people should buy their Motor oil is by the SAE specification, SAE =
Service range and equipment ambient temperature operating ranges as =
established by the vehicle manufacturer, and as stated in the =
owner=E2=80=99s manuals and TSB updates from the manufacturer. =
<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>So when people argue about which brake fluid or motor =
oil is better, =E2=80=9Cbetter=E2=80=9D is a relative term.=C2=A0 Each =
J170x standard represents improvements in the brake fluid formulations =
mostly designed for higher boiling temperatures and more consistent =
viscosity to reduce the potential of cavitation.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>DOT 4 was =
created to reduce the potential of the fluid to cavitate when passing =
through a rapidly stroking valve in the ABS system.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>For an LBC, =
my experience is either use Castrol LMA DOT3 Crimson, or DOT5, because =
you do simply do not know what the seals in the system are made of and =
those two fluids seem to not cause seal deterioration of seals made of a =
wide range of rubber materials =E2=80=93 in my experience.=C2=A0 =
<o:p></o:p></p><p class=3DMsoNormal>My personal preference is DOT 5 =
(purple) because it does not eat my paint, I know it will not react with =
my seals, it has a higher boiling temperature than DOT 3, and is not =
hygroscopic which would cause water to pool at the system low points =
right at the seal to metal location and cause =
corrosion.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Let the =E2=80=9Cfluif=E2=80=9D arguments =
continue!<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Glenn aka StagByTriumph Garage<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Triumphs =
<triumphs-bounces@autox.team.net> <b>On Behalf Of </b>Philip =
Ethier<br><b>Sent:</b> Saturday, April 29, 2023 2:09 PM<br><b>To:</b> =
Don Hiscock <don.hiscock@gmail.com><br><b>Cc:</b> =
triumphs@autox.team.net; Joel Justin =
<j_bar_j@hotmail.com><br><b>Subject:</b> Re: [TR] Dot 5 brake =
fluid<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Thu, Apr 27, 2023 at 3:32=E2=80=AFPM Don Hiscock <<a =
href=3D"mailto:don.hiscock@gmail.com";>don.hiscock@gmail.com</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt'>The nomenclature =
around DOT5 (silicone) and DOT5.1 (glycol) never made any sense to =
me...<o:p></o:p></span></p></div></div></blockquote><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>The stupidest decision imaginable. Why not DOT6? =
Or DOT4.1? Just ridiculous. <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal> <o:p></o:p></p></div></div></div></div></bo=
dy></html>
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