I had the same problem with my front brake. The front brake has three main parts: The Plunger, Brake Lever, and Brake Switch. When you apply the brake the lever pushes in the plunger which pushes the brake fluid forward to apply the brake. When this happens the brake switch is disengaged making the brake light turn on. When you release the lever the plunger returns and engages the switch turning off the brake light.
Like you I thought I needed a new brake switch, but when I took apart my assembly I noticed that my plunger was not returning all the way. I applied some grease to the plunger shaft and pushed it in and out several times to spread the grease. It now work as it should.
April 21, 2014
How I Ride: Local - With Passenger
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