Subject: Re: [TR] "More reliable" sidescreen brake pressure switch for DOT5/silicone?

From: David Templeton <[email-masked]>
Date: Mon, 8 Sep 2025 02:34:18 -0400

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Don,

I fabricated a bracket to attach to the brake pedal and install a standard
GM brake switch. The upside is that it allowed the adjustment of the
switch.  Then made a two-wire harness to the original pressure switch and
hooked it in parallel to the original connection.   It can easily be
removed and is well hidden.  I simply touch the brake pedal, and the lights
come on.

David

On Sun, Sep 7, 2025 at 10:29=E2=80=AFPM Don Hiscock <[email-masked]>=
 wrote:

> I converted my TR3B to DOT5 three years ago.  I've been waiting for the
> silicone oil to get into the pressure switch and cause it to quit working=
.
> That time is here.
>
> Yes, I could convert to a TR6 mechanical switch actuated by the brake
> pedal lever.  I may end up there.  But it's fun to keep this car as
> original as I can.  Is any one supplier's or source's brake pressure swit=
ch
> any more reliable than the others around DOT5?
>
> It was a nice day the other day, so the TR3B made the drive to the
> village mailboxes now that I"m living in northern New Mexico.  Forty four
> years last month that I've owned this thing.
>
>
> https://photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzkvQRPj3kgscg4GSP4mLXM=
MpmfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg
>
> ** [email-masked] **
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs
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>

--=20
Regards
David Templeton
Ontario, Canada
1959 TR3a TS54226L
1974 Spitsix FM10491L

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:tahoma,s=
ans-serif">Don,=C2=A0</div><div class=3D"gmail_default" style=3D"font-famil=
y:tahoma,sans-serif"><br></div><div class=3D"gmail_default" style=3D"font-f=
amily:tahoma,sans-serif">I fabricated a bracket=C2=A0to attach to the brake=
 pedal and install a standard GM brake switch. The upside=C2=A0is that it a=
llowed the adjustment of the switch.=C2=A0 Then made a two-wire harness=C2=
=A0to the original pressure switch and hooked it in parallel to the origina=
l connection.=C2=A0 =C2=A0It can easily be removed and is well hidden.=C2=
=A0 I simply touch the brake pedal, and the lights come on.=C2=A0 =C2=A0</d=
iv><div class=3D"gmail_default" style=3D"font-family:tahoma,sans-serif"><br=
></div><div class=3D"gmail_default" style=3D"font-family:tahoma,sans-serif"=
>David</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Sun, Sep 7, 2025 at 10:29=E2=80=AFPM D=
on Hiscock &lt;<a href=3D"mailto:[email-masked]">[email-masked]=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">I=
 converted my TR3B to DOT5 three years ago.=C2=A0 I&#39;ve been waiting for=
 the silicone oil to get into the=C2=A0pressure switch and cause it to quit=
 working.=C2=A0 That time is here.</div><div class=3D"gmail_default" style=
=3D"font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-s=
ize:small">Yes, I could convert to a TR6 mechanical switch actuated by the =
brake pedal lever.=C2=A0 I may end up there.=C2=A0 But it&#39;s fun to keep=
 this car as original as I can.=C2=A0 Is any one supplier&#39;s or source&#=
39;s brake pressure switch any more reliable than the others around DOT5?</=
div><div class=3D"gmail_default" style=3D"font-size:small"><br></div><div c=
lass=3D"gmail_default" style=3D"font-size:small">It was a nice day the othe=
r day, so the TR3B made the drive to the village=C2=A0mailboxes now that I&=
quot;m living in northern New Mexico.=C2=A0 Forty four years last month=C2=
=A0that I&#39;ve owned this thing.</div><div class=3D"gmail_default" style=
=3D"font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-s=
ize:small"><a href=3D"https://photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzk=
vQRPj3kgscg4GSP4mLXMMpmfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg" target=3D"_blank">h=
ttps://photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzkvQRPj3kgscg4GSP4mLXMMpm=
fG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg</a></div><div class=3D"gmail_default" style=
=3D"font-size:small"><br></div></div>
** <a href=3D"mailto:[email-masked]" target=3D"_blank">triumphs@au=
tox.team.net</a> **<br>
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs" rel=3D"noreferr=
er" target=3D"_blank">http://www.team.net/pipermail/triumphs</a>=C2=A0 <a h=
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hs/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://au=
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</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_s=
ignature"><div dir=3D"ltr"><div><div dir=3D"ltr"><font face=3D"tahoma, sans=
-serif">Regards</font><div><font face=3D"tahoma, sans-serif">David Templeto=
n</font></div><div><font face=3D"tahoma, sans-serif">Ontario, Canada</font>=
</div><div><font face=3D"tahoma, sans-serif">1959 TR3a=C2=A0TS54226L</font>=
</div><div><font face=3D"tahoma, sans-serif">1974 Spitsix=C2=A0<span style=
=3D"color:rgb(84,84,84)">FM10491L</span></font></div></div></div></div></di=
v>

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From: DAVID MASSEY <[email-masked]>
Date: Mon, 8 Sep 2025 11:27:23 +0000 (UTC)

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I went the MGB route.=C2=A0 The brake light switch used on the early MGB re=
places the pedal stop on the pedal box as can be seen in the attached pictu=
re.
Dave=20

=20

    On Sunday, September 7, 2025 at 09:33:17 PM CDT, Don Hiscock <don.hisco=
[email-masked]> wrote:  =20

 I converted my TR3B to DOT5 three years ago.=C2=A0 I've been waiting for t=
he silicone oil to get into the=C2=A0pressure switch and cause it to quit w=
orking.=C2=A0 That time is here.
Yes, I could convert to a TR6 mechanical switch actuated by the brake pedal=
 lever.=C2=A0 I may end up there.=C2=A0 But it's fun to keep this car as or=
iginal as I can.=C2=A0 Is any one supplier's or source's brake pressure swi=
tch any more reliable than the others around DOT5?
It was a nice day the other day, so the TR3B made the drive to the village=
=C2=A0mailboxes now that I"m living in northern New Mexico.=C2=A0 Forty fou=
r years last month=C2=A0that I've owned this thing.
https://photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzkvQRPj3kgscg4GSP4mLXMMp=
mfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg
** [email-masked] **

Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive

[email-masked]
 =20
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<html><head></head><body><div class=3D"ydp8b7922a8yahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div><div dir=
=3D"ltr" data-setdir=3D"false">I went the MGB route.&nbsp; The brake light =
switch used on the early MGB replaces the pedal stop on the pedal box as ca=
n be seen in the attached picture.</div><div><br></div><div class=3D"ydp8b7=
922a8signature"><div style=3D"color: black; font-style: normal; font-size-a=
djust: none; font-weight: normal; font-stretch: normal; font-size: 12pt; li=
ne-height: normal; font-family: Arial, Helvetica, sans-serif;"><div style=
=3D"color: black; font-style: normal; font-size-adjust: none; font-weight: =
normal; font-stretch: normal; font-size: 12pt; line-height: normal; font-fa=
mily: Arial, Helvetica, sans-serif;"><div><font size=3D"4">Dave <br></font>=
</div><div><span style=3D"font-size:10.0pt;font-family:sans-serif;color:bla=
ck;"><br></span></div><br></div></div></div></div>
        <div><br></div><div><br></div>
       =20
        </div><div id=3D"ydp79a924b3yahoo_quoted_7891467656" class=3D"ydp79=
a924b3yahoo_quoted"><div class=3D"ydp79a924b3yahoo-style-wrap" style=3D"fon=
t-family:Arial, Helvetica, sans-serif;font-size:16px;">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div class=3D"ydp79a924b3quoted-text-header">
                        On Sunday, September 7, 2025 at 09:33:17 PM CDT, Do=
n Hiscock &lt;[email-masked]&gt; wrote:
                    </div>
                </div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"ydp79a924b3inline_rep=
ly_quote_container" data-split-quote-node=3D"true">
                <div><br></div><div><br></div>
                <div><div id=3D"ydp79a924b3yiv4201813506"><div dir=3D"ltr">=
<div style=3D"font-size:small;" class=3D"ydp79a924b3yiv4201813506gmail_defa=
ult">I converted my TR3B to DOT5 three years ago.&nbsp; I've been waiting f=
or the silicone oil to get into the&nbsp;pressure switch and cause it to qu=
it working.&nbsp; That time is here.</div><div style=3D"font-size:small;" c=
lass=3D"ydp79a924b3yiv4201813506gmail_default"><br></div><div style=3D"font=
-size:small;" class=3D"ydp79a924b3yiv4201813506gmail_default">Yes, I could =
convert to a TR6 mechanical switch actuated by the brake pedal lever.&nbsp;=
 I may end up there.&nbsp; But it's fun to keep this car as original as I c=
an.&nbsp; Is any one supplier's or source's brake pressure switch any more =
reliable than the others around DOT5?</div><div style=3D"font-size:small;" =
class=3D"ydp79a924b3yiv4201813506gmail_default"><br></div><div style=3D"fon=
t-size:small;" class=3D"ydp79a924b3yiv4201813506gmail_default">It was a nic=
e day the other day, so the TR3B made the drive to the village&nbsp;mailbox=
es now that I"m living in northern New Mexico.&nbsp; Forty four years last =
month&nbsp;that I've owned this thing.</div><div style=3D"font-size:small;"=
 class=3D"ydp79a924b3yiv4201813506gmail_default"><br></div><div style=3D"fo=
nt-size:small;" class=3D"ydp79a924b3yiv4201813506gmail_default"><a href=3D"=
https://photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzkvQRPj3kgscg4GSP4mLXMMp=
mfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg" rel=3D"nofollow" target=3D"_blank">https:=
//photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzkvQRPj3kgscg4GSP4mLXMMpmfG2cq=
zZbBW4/X5/i-QRBNGvw-X5.jpg</a></div><div style=3D"font-size:small;" class=
=3D"ydp79a924b3yiv4201813506gmail_default"><br></div></div>
</div>** <a href=3D"mailto:[email-masked]" rel=3D"nofollow" target=
=3D"_blank">[email-masked]</a> **<br><br>Donate: <a href=3D"http:/=
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From: Don Hiscock <[email-masked]>
Date: Sun, 14 Sep 2025 20:59:17 -0600

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Harley-Davidson used DOT5 silicone brake fluid in their motorcycles from
the mid 1970s until the mid 2000s, when ABS started coming in.  The current
H-D brake pressure switch is reportedly backwardly compatible to any brake
fluid.  P/N 72023-51E is likely on any local dealership's shelves for about
$35 and comes in a kit with two new 025 quick disconnects.  It's made by
Bitron in Italy and uses the same 1/8" NPT threading as the original.  It
mounts with a 17mm wrench/deep socket, compared to the 7/8" hex on my
TR3B's original.  (Earlier versions with the same H-D P/N but lower
alphabetical suffixes were made in USA and were larger hex.)

For now, I'm back in the brake-lighting business.  Thanks to those who
suggested various mechanical switch conversions, but I'm trying to stay
closer to original with the car.  We'll see how this works out.  Assume,
hearing nothing to the contrary, it's workin' fine.

-- Don
1962 TR3B TSF202L

On Sun, Sep 7, 2025 at 8:08=E2=80=AFPM Don Hiscock <[email-masked]> =

.
ch

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">Har=
ley-Davidson used DOT5 silicone brake fluid in their motorcycles from the m=
id 1970s until the mid 2000s, when ABS started coming in.=C2=A0 The current=
 H-D brake pressure switch is reportedly backwardly compatible to any brake=
 fluid.=C2=A0 P/N 72023-51E is likely on any local dealership&#39;s shelves=
 for about $35 and comes in a kit with two new 025 quick disconnects.=C2=A0=
 It&#39;s made by Bitron in Italy and uses the same 1/8&quot; NPT threading=
 as the original.=C2=A0 It mounts with a 17mm wrench/deep socket, compared =
to the 7/8&quot; hex on my TR3B&#39;s original.=C2=A0 (Earlier versions wit=
h the same H-D P/N but lower alphabetical suffixes were made in USA and wer=
e larger hex.)</div><div class=3D"gmail_default" style=3D"font-size:small">=
<br></div><div class=3D"gmail_default" style=3D"font-size:small">For now, I=
&#39;m back in the brake-lighting business.=C2=A0 Thanks to those who sugge=
sted various mechanical switch conversions, but I&#39;m trying to stay clos=
er to original with the car.=C2=A0 We&#39;ll see how this works out.=C2=A0 =
Assume, hearing nothing to the contrary, it&#39;s workin&#39; fine.</div><d=
iv class=3D"gmail_default" style=3D"font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-size:small">-- Don</div><div class=3D"gmai=
l_default" style=3D"font-size:small">1962 TR3B TSF202L</div><div class=3D"g=
mail_default" style=3D"font-size:small"><br></div><div class=3D"gmail_defau=
lt" style=3D"font-size:small"><img src=3D"https://photos.smugmug.com/photos=
/i-rWZRR59/0/Nhf57tfhhNwQ27bRhjbfqzB6g9HJCfsMqRsn5JHJX/X5/i-rWZRR59-X5.jpg"=
 width=3D"562" height=3D"422"><br></div><div class=3D"gmail_default" style=
=3D"font-size:small"><img src=3D"https://photos.smugmug.com/photos/i-Wtb2RH=
x/0/LX7b3Cm6ZDHCsg6LZmCjTpdxzx9JbRFzjhc3G2TmT/X5/i-Wtb2RHx-X5.jpg" width=3D=
"562" height=3D"422"><br></div></div><br><div class=3D"gmail_quote gmail_qu=
ote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Sep 7, 2025 at=
 8:08=E2=80=AFPM Don Hiscock &lt;<a href=3D"mailto:[email-masked]">d=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"=
font-size:small">I converted my TR3B to DOT5 three years ago.=C2=A0 I&#39;v=
e been waiting for the silicone oil to get into the=C2=A0pressure switch an=
d cause it to quit working.=C2=A0 That time is here.</div><div class=3D"gma=
il_default" style=3D"font-size:small"><br></div><div class=3D"gmail_default=
" style=3D"font-size:small">Yes, I could convert to a TR6 mechanical switch=
 actuated by the brake pedal lever.=C2=A0 I may end up there.=C2=A0 But it&=
#39;s fun to keep this car as original as I can.=C2=A0 Is any one supplier&=
#39;s or source&#39;s brake pressure switch any more reliable than the othe=
rs around DOT5?</div><div class=3D"gmail_default" style=3D"font-size:small"=
><br></div><div class=3D"gmail_default" style=3D"font-size:small">It was a =
nice day the other day, so the TR3B made the drive to the village=C2=A0mail=
boxes now that I&quot;m living in northern New Mexico.=C2=A0 Forty four yea=
rs last month=C2=A0that I&#39;ve owned this thing.</div><div class=3D"gmail=
_default" style=3D"font-size:small"><br></div><div class=3D"gmail_default" =
style=3D"font-size:small"><a href=3D"https://photos.smugmug.com/photos/i-QR=
BNGvw/0/KvPKhzkvQRPj3kgscg4GSP4mLXMMpmfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg" targ=
et=3D"_blank">https://photos.smugmug.com/photos/i-QRBNGvw/0/KvPKhzkvQRPj3kg=
scg4GSP4mLXMMpmfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg</a></div><div class=3D"gmail=
_default" style=3D"font-size:small"><br></div></div>
</blockquote></div>

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