Author Topic: Alternative brake pedal switch?  (Read 262 times)

Offline teuski

  • Curious
  • Posts: 9
Alternative brake pedal switch?
« on: May 31, 2020, 04:54:05 PM »
Anyone know a good replacement for an old K100 brake pedal switch?

For a quick DIY solution it would be nice to know if the switch is of opening or closing type? The button goes "up" when the pedal is depressed.
  • Finland
  • K100 '84

Offline rbm

  • ^ Quintessential Motobricker
  • Posts: 1973
Re: Alternative brake pedal switch?
« Reply #1 on: May 31, 2020, 06:07:04 PM »
Brake switch is normally closed.  The brake pedal maintains pressure on the switch when at rest, opening the circuit. When you press the brake, pressure is relieved and the switch closes.

There are two different types of switches.  One is a cylindrical plunger type and the other is a square microswitch.  What type do you have?
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline 850Commando

  • Motobrick Curious
  • Posts: 48
Re: Alternative brake pedal switch?
« Reply #2 on: May 31, 2020, 07:59:05 PM »
  • London UK
  • 1993 K75

Offline kioolt

  • ^ Proficient Motobricker
  • Posts: 237
Re: Alternative brake pedal switch?
« Reply #3 on: May 31, 2020, 09:06:36 PM »
Hmmm - maybe this would work:  https://www.autoelectricsupplies.co.uk/product/955/category/38

Another thing to be considered is ability of the switch to withstand the rain that it would be exposed to.
2018 R1200RT 8,000 miles,2004 R1150RT 189,000 miles
1991 K100LT 128,700 miles,1982 R100RT 106,900 miles
The cheapest thing on a BMW is the nut that connects the seat to the handlebars.

Offline Martin

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Re: Alternative brake pedal switch?
« Reply #4 on: May 31, 2020, 09:33:50 PM »
A local electronic supply store should be able to supply something that you could adapt. Take the old one with you for comparison. And waterproof it.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline teuski

  • Curious
  • Posts: 9
Re: Alternative brake pedal switch?
« Reply #5 on: June 01, 2020, 01:19:49 AM »
Thank you all for the tips.

I happen to have a pile of mostly Chinese scooter parts. Tried to scavenge from there but couldn't find any suitable switch. Last time i had the same need with front brake switch i used a scooter microswitch as a stopgap solution until i found a new original switch.

My bike's switch is of plunger type. At work I did find a microswitch from an old electronics spare part supply with a ready plunger assembly with both NC and NO contacts. The plunger has a smaller diameter thread than my bike so i could easily adapt it to fit in place. I did some crude weatherproofing with shrink tube and electric tape. It's not going to be pretty but i'm sure it will work  :laughing1:
  • Finland
  • K100 '84

Offline teuski

  • Curious
  • Posts: 9
Re: Alternative brake pedal switch?
« Reply #6 on: June 01, 2020, 11:20:36 AM »
... and there it is, plug'n'play  112350
  • Finland
  • K100 '84

Offline Laitch

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Re: Alternative brake pedal switch?
« Reply #7 on: June 01, 2020, 11:29:12 AM »
Looks like a female member of a one-legged alien species. Good work!  icon_cheers
  • Along the Ridley in Vermont.
  • 1995 K75 77,000 miles
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Offline volador

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  • Posts: 927
  • NEEDS MORE CHROME
Re: Alternative brake pedal switch?
« Reply #8 on: June 03, 2020, 07:22:41 PM »
Geez Mary & Joseph what a fecking waste of time. PM or email your address I send you a used serviceable switch my frugal Finnish friend
  • NYC NY
  • 1991 K100RS 1993 K75S ABS
5 BOROUGHS SISYPHEAN SOCIETY  MAINTAINING THE OBSESSION

Offline teuski

  • Curious
  • Posts: 9
Re: Alternative brake pedal switch?
« Reply #9 on: June 04, 2020, 12:04:35 AM »
Geez Mary & Joseph what a fecking waste of time. PM or email your address I send you a used serviceable switch my frugal Finnish friend
Can you really call it a waste of time if it keeps me on 2 wheels instead of four while i find a correct one?  :laughing1:

Thanks for the offer, i'll PM you right away.
  • Finland
  • K100 '84

Offline volador

  • ^ SuperNatural Motobricker
  • Posts: 927
  • NEEDS MORE CHROME
Re: Alternative brake pedal switch?
« Reply #10 on: June 04, 2020, 12:29:53 AM »
Touché

give me a few days too have Mr. Bentley search the spares inventory find the bloody thing
  • NYC NY
  • 1991 K100RS 1993 K75S ABS
5 BOROUGHS SISYPHEAN SOCIETY  MAINTAINING THE OBSESSION

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