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I have a 97' RK and the brake light flickers on and off. I have determined that the brake lever does not fit tightly between the switch and the master cylinder piston. I have inspected the switch and it doesn't seem to have the end broken off and the copper wedge is in place. I think the spring on the piston is worn not pushing the piston all the way back out?
This was a common problem with '97 model year. Had a sporty and a WG with it. The official answer is to rebuild the master cylinder. At the time I put a little dab of JB weld - about 2-3mm - on the brake lever right where it contacts the switch.
However, since yours is now 9 years old, I'd suggest rebuilding the MC. It's easy to do, and costs about $20 or so.
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