How to: Rebuild Seca II Front Brake Switch

How-to's pertaining to the electrical system, ignition, lights and battery
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How to: Rebuild Yamaha Seca II Front Brake Switch

I was working on my bike and I noticed that the brake switch was sliding back and forth with a lot of resistance; here's how to fix that problem. This should also remedy a non-working rear brake light if the switch is to blame.

What you'll need:
  • Phillips/flat head screwdriver
  • old brush(tooth brush)
  • soap
  • grease
  • paper towels
The switch is held in place with two Phillips-head screws; remove those screws and then un-plug the connector. The switch should now pull right out.

Once you have the switch off, use a flat-head screwdriver (or butter knife) to carefully pry it apart:

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It should split into two pieces, like this:

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As it comes apart, be careful not to lose this piece:

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Take out all the little parts and be careful not to lose them!

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Scrub the parts with a toothbrush and some dish soap:

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During reassembly, grease the slider:

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But don't go to crazy with the grease. Clean any extra grease off so its just on the pin and spring:

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Clip the top switch back together and verify it operates smoothly.

Note, the order of assembly for these parts is as follows: Black pin slides into the hole on the bottom of a cover, put the big spring over the pin once its in the cover, the white piece will compress the spring a little and lock onto the black pin, then drop it into the cover, put the little spring in the white square and the copper contact point over the spring.
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