[TR] DOT5 & brake pressure switch

[David Templeton]

For those interested, this is how I did mine.   I made a bracket
25years ago :-)   And it is still holding up just fine.  And the switch, as
I said, a generic long thread brake switch.  I think I paid $15cdn when I
replaced it 6years ago.  The green wires are then ran along other harnesses
to hook into the pressure switch on the passenger frame

David

[image: 20250909_074519.jpg]
[image: 20250909_074538.jpg][image: 20250909_074545.jpg]

On Mon, Sep 8, 2025 at 9:08 PM aribert neumann <aribertn at gmail.com> wrote:

> I don't have any knowledge of a TR3B   (I drove my Spit6 today, 50 mile
> round trip, plan to do the same tomorrow).
>
> I converted my '61 Ford Falcon to DOT5 about 25 yrs ago.  I have also
> experienced the much shorter (hydraulic) switch life with DOT5.   I tap the
> brakes prior to opening the garage door to check for brake light function
> on any of my vehicles before departing home.   With the hydraulic brake
> switch using DOT5, first the brake pedal displacement and then the braking
> effort (to activate the brake lights) will increase as the switch begins to
> fail.  I expect to replace the switch up to twice a year - I drive the car
> 8 months out of the year.   I am willing to replace switches rather than
> cut into the harness.   I replace the switch without needing to do any
> brake bleeding.
>
> I buy a half dozen switches at a time from RockAuto.   The switch for my
> Ford is Standard Parts SLS27, the switch has two round pins to engage the
> harness.  In the past decade there is now a slip of paper in the switch box
> warning me not to use DOT5.
>
>
>
> ------- Forwarded message ----------
> From: Don Hiscock <don.hiscock at gmail.com>
> To: Triumphs list <triumphs at autox.team.net>
> Cc:
> Bcc:
> Date: Sun, 7 Sep 2025 20:08:21 -0600
> Subject: [TR] "More reliable" sidescreen brake pressure switch for
> DOT5/silicone?
> 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 switch
> 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/KvPKhzkvQRPj3kgscg4GSP4mLXMMpmfG2cqzZbBW4/X5/i-QRBNGvw-X5.jpg
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-- 
Regards
David Templeton
Ontario, Canada
1959 TR3a TS54226L
1974 Spitsix FM10491L
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