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Ditto on the rain-x thing, I have a 93 Z-71 and the wipers did the same thing. I went to a junkyard to get a temporary fix, and they were sold out. Seems to be a common problem on these. I went to purchase a new one and the guy at the parts store "heard" that they had a bad ground in them, and were notorious for going out. I put a small ground strap on one of the bolts and attached to the firewall since it is mounted (and isolated) on rubber grommets. Havent had a problem since (over a year). Dont know if the brake light is involved but would be curious if they were adjoining circuits? When the brake light comes on again, pull off the connector on your proportioning valve and see if it dissappears. It might be supplying a ground to "whatever" (wiper motor -maybe) and could explain why it came on dim the last time. Let us know what you find out. Good luck.
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