Re: {Chrysler 300} Brake switch for silicone fluid
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Re: {Chrysler 300} Brake switch for silicone fluid



Hi ,
I got into this after a few failures , I took one apart by cutting as i felt at the time it was inaccurate and anecdotal story  that DOT 5 (which i use always ) causes switch failure . But here were failures , and i never had a hydraulic switch fail before —,ever . 
So inside the switch there was a white coating on the switch contacts . Further looking into it from EE perspective  , there is some kind of chemical decomposition of the silicone oil when an intense enough arc happens in it . That probably means current level / heat when the contacts separate millionths of an inch as silicone itself is a very good insulator ( 40,000 v per .1” !) . 
The problem is not unlike points , and current is maybe 4 A, ok in oil or apparently glycol , but chemically the arc does something to silicone oil leaving an insulating residue on the contacts . 
So after seeing it myself , I admit  to a 180 .
Contacts in silicone oil are a bad idea no matter what you do , one might envision sliding self scraping contacts etc etc but the basic problem is real . I expected a bellows or something but contacts them selves were in the oil . These were stock switches . Unless a bellows is used moving contacts out if oil is in  a Harley switch , it has to deal with the residue . 
( like batteries discharging on cement floors — also true— another 180 ) .
Best cure is microswitch on pedal box , V3 with a long arm is a good place to start to roll your own , — as it is a matter of when it fails ( number of operations ) not if .
Being rear ended because of no brake lights and you don’t know that is not a happy day . 
Quick check watch ammeter when stepping you can see the jump . 
John 

Sent from my iPhone

On Apr 24, 2023, at 6:41 AM, dplotkin <dplotkin@xxxxxxxxxxxxxxxxxxx> wrote:


The Harley-Davidson hydraulic brake light switch works with Dot 5. I have had that switch in my 300f with Dot 5 since 2019 no trouble. I don't know anything about mixed reviews either I have not heard anybody else say a negative thing about it.

Danny Plotkin 



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: "D.C. Mason" <petergriffinforpresident@xxxxxxxxx>
Date: 4/23/23 10:55 PM (GMT-05:00)
To: 300 Club <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Brake switch for silicone fluid

Hello club,

In reviewing the email archives I read mixed reviews on the Harley brake light switch (P/N 72023-51D ) that is supposed to be silicone proof.  Has anyone had good luck with a pressure switch or is the consensus to put a switch at the pedal?  Lots of old cars used the pressure switch but guessing they are all prone to failure with Dot5….
Thanks,
D&K

Sent from my iPhone

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