My Willys 3A and 3B Community

3A, 3B, DJ Technical Knowledge Base => "Modifications"-- Technical Questions, Answers, Incites => Topic started by: Ryan_M on May 29, 2014, 08:10:10 PM

Title: Mechanical Brake Light Switch
Post by: Ryan_M on May 29, 2014, 08:10:10 PM
Like most of my best ideas this one is not mine at all.

The brake light pressure switches are notoriously lousy and a real pain to swap out, especially if your rig has the master cylinder heat shield. After replacing two of them on my 3A and then having the one on the M38 go Tango Uniform after only a few months I decided, "Enough!".

Just tonight, I installed a mechanical switch by attaching it to the MC access panel. I precisely eyeballed the fit, drilled two holes, and bolted it on. I was able to leave the faulty pressure switch in place and simply relocated the wires to their new home.

I experimented on the M38 as two more holes in the floor will barely be noticed but if this works I'll likely do the same thing on the 3A when that new pressure switch inevitably croaks. I've seen fancier set-ups with roller actuators bolted to the brake pedal arm but I'm curious to see how long this "down and dirty" arrangement will last.

(http://i1188.photobucket.com/albums/z403/rmurdock2121/1952%20M38/20140529_185529_zpsf621a73b.jpg)

(http://i1188.photobucket.com/albums/z403/rmurdock2121/1952%20M38/20140529_185535_zpsed157c39.jpg)

(http://i1188.photobucket.com/albums/z403/rmurdock2121/1952%20M38/20140529_191541_zpsb73d1dce.jpg)

(http://i1188.photobucket.com/albums/z403/rmurdock2121/1952%20M38/20140529_191547_zps238200fb.jpg)

(http://i1188.photobucket.com/albums/z403/rmurdock2121/1952%20M38/20140529_191908_zpsade0b170.jpg)
Title: Re: Mechanical Brake Light Switch
Post by: athawk11 on May 30, 2014, 09:12:49 PM
That's a pretty cool set up.  I didn't even know there was such an option.  If I start losing my switches, I'll consider this mod!

Thanks for showing us.

Tim
Title: Re: Mechanical Brake Light Switch
Post by: Jesse on May 31, 2014, 05:57:40 PM
Nice trick. Not sure why some people have problems with the switch though, been driving the jeep for 5 years now and it's still fine.  :-?

-Jesse
Title: Re: Mechanical Brake Light Switch
Post by: SteveW on June 01, 2014, 06:36:39 AM
I put one on mine, Nice easy fix. I had cover upside down first time so I have a spare hole with bolt. Oops.
Title: Re: Mechanical Brake Light Switch
Post by: 64CJ5 on October 29, 2015, 09:15:03 PM
Looks like the switch and location I used when I installed a dual master cylinder.  I think I used one for a 50's Chevy pickup.  Wasn't an original idea, but it works well.
Title: Re: Mechanical Brake Light Switch
Post by: Mike S on February 27, 2016, 10:10:33 PM
Lots of folks (myself included) have installed dual brake master cylinders and lost the pressure switch that services the brake lights. This - or something like it - is the answer.
Title: Re: Mechanical Brake Light Switch
Post by: garage gnome on February 27, 2016, 10:17:42 PM
I might have to do this to my red jeep. That thing keeps eating them. I have a spare one of those switches for my 55. That's what it uses.
Title: Re: Mechanical Brake Light Switch
Post by: Kirkski on August 01, 2019, 03:03:55 PM
Any updates on this repair... my brake switch bit the dust and looking for another option
Title: Re: Mechanical Brake Light Switch
Post by: 1955CJ-5 on August 01, 2019, 09:59:16 PM
Just an idea, I haven't tried it on a jeep, but the Model A Ford brake light switch is a pull to actuate switch...might be used with a long spring on the brake pedal?

https://modelastore.com/index.php?route=product/product&product_id=4403&search=light+switch&category_id=0
Title: Re: Mechanical Brake Light Switch
Post by: SteveKfl on August 02, 2019, 01:40:39 PM
Why not a "T" fitting in one of the lines, or here's a mechanical switch option for the pedal movement...  https://www.ebay.com/itm/Brake-Switch-Lever-Action-Style-LEFT-HAND-hot-rat-rod-street-custom-floor/301039680499?hash=item46175cfbf3:g:tpQAAOSwBkRaOAMx