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Hot Rods Brake light pressure switch

Discussion in 'The Hokey Ass Message Board' started by HOTRODPRIMER, Oct 6, 2020.

  1. Roothawg
    Joined: Mar 14, 2001
    Posts: 22,487


    Mine is LED's and I still average 3 switches over a 2 year span.
    HOTRODPRIMER likes this.
  2. break - separate or cause to separate into pieces as a result of a blow, shock, or strain.

    brake - a device for slowing or stopping a moving vehicle, typically by applying pressure to the wheels.

  3. grumpy65
    Joined: Dec 19, 2017
    Posts: 925


    Have you ever noticed that they seem to break fast, especially really early in the morning?
    Sorry, couldn't resist......................
  4. winduptoy
    Joined: Feb 19, 2013
    Posts: 2,631


    Oh, yes of course... but if it doesn't work, it's a break light switch. If it worked it would be a brake light switch.
    I haven't had any luck with the hydraulic aftermarket switches.
    HD has hung in there

    Sent from my XT1585 using The H.A.M.B. mobile app
    HOTRODPRIMER and grumpy65 like this.
  5. grumpy65
    Joined: Dec 19, 2017
    Posts: 925


    If you break brake light swithes, steer clear of bakelite brake light switches as bakelite will surely break.
    Hang on, is it light or lite ???????

    Yes, ok, I am leaving now. There is no need for all the swearing and moaning. :confused:
    Hnstray and HOTRODPRIMER like this.
  6. Au contraire mon ami, I believe it would be a broken stop light switch! :D HRP
    clem, 3W JOHN and dirty old man like this.
  7. Blue One
    Joined: Feb 6, 2010
    Posts: 11,257

    Blue One
    from Alberta

    Wow now we have an English major weighing in :D or more likely an English minor who failed his ESL classes :D:D

    Give it a rest, whether functional or not it’s still a brake light activation switch.
    clem, dirty old man and HOTRODPRIMER like this.
  8. All in good fun Larry. :D HRP
    grumpy65, Blue One and 3W JOHN like this.
  9. fortynut
    Joined: Jul 16, 2008
    Posts: 1,038


    I am in the process of paying for a Basket Case '40 Ford Pickup. As it build it, I am going to use LED passenger car tail-lights. I have read that there are several methods for doing this, one it to wire an Edison style filament bulb into the circuit to create enough resistance for the flasher to function, as such I will use it as a method to indicate the system is functioning. And, yes, for those throwing a tantrum about what kind of STOP light switch is best, I will be using a mechanical switch that will encased in silicone as a preventive measure to keep moisture out. My argument is not that Pressure Switches are Bad, or inferior. My argument is that the Mechanical Switch is something I was using on my Hot Rods and so were others when I was knee high to a grasshopper back when Ethyl was not the cow on Elmer's glue, and when you could buy Coca Colas out of a drink machine for a nickel. Yes. I'm old enough to remember what was what when 'traditional' was still in knee pants.
  10. I found out today that Harley-Davidson outsources the brake light switch, They use a ECHLIN SL147 switch which is also available at NAPA. HRP
  11. 3W JOHN
    Joined: Oct 8, 2015
    Posts: 1,040

    3W JOHN

    Bet the one in the Harley Davidson box cost three time as much!
    Hnstray and HOTRODPRIMER like this.
  12. speedshifter
    Joined: Mar 3, 2008
    Posts: 312


    I have heard silicone brake fluid shortens the life of pressure switches. Any views on this? Greg
    HOTRODPRIMER likes this.
  13. 51504bat
    Joined: May 22, 2010
    Posts: 3,394


    I should have never looked at this thread. Went o coffee this morning in my '39 p/u. No brake lights. I think the low pressure one had a life time guarantee for what that's worth. Think I try the Napa one HRP posted.
    HOTRODPRIMER likes this.
  14. deathrowdave
    Joined: May 27, 2014
    Posts: 2,830

    from NKy

    Silicone fluid seems to add life to the switch . The switches on the Shovel , have been in service beginning in 75 and still function . Now the next time I ride ,it’s fair to say they both , will be busted and not work after I spoke up .
    51504bat likes this.
  15. justpassinthru
    Joined: Jul 23, 2010
    Posts: 366


    Has anyone ever taken one apart to see just what made the switch stop working? I have not.

    Does it mechanically get stuck somehow, plugged up with debris, or do the contacts just get too corroded to pass current?

    I would think the contacts would be the most likely culprit. Brake light circuit is typically a high current draw circuit, and brake light switches are typically wired directly into that circuit.

    Has anyone wired in a brake light pressure switch to operate a relay at low amperage and then the brake lights are fed through relay and not through the switch?

    Just curious.

  16. sedantudor
    Joined: Jan 28, 2012
    Posts: 112


    I have been running the same switch mounted on the master for over 9 years, works great. Now I think I need to go check, been a while since I have seen the back of my car when I am behind the wheel.
  17. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 3,993

    from illinois

    2-1157 bulbs draw about 2 amps , hardly " high current draw ".. If they're LED its less than that ...
  18. flat 39
    Joined: Dec 31, 2007
    Posts: 253

    flat 39

    I took apart a failed H-D switch. The contacts were burned after two years of use. I was using extra bright hologin tail light bulbs. I have changed to LED and so far so good.
  19. I've used the Harley 72023-51E in all three of my '40s and on my '54 F100. The one in the coupe has been in there for at least 10 years and going strong, the stake truck 8 years, and I just got the panel on the road this spring. The low pressure lights them up early and they have seemed to last. They look like the small diameter one you posted a picture of earlier, Danny, and not the Napa switch.
  20. Boden
    Joined: Oct 10, 2018
    Posts: 747


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