Gmc Ck Pickup Questions

i tried bleeding the brakes but only the front passenger side has ...

i tried bleeding the brakes but only the front passenger side has fluid. the others wont release thier pressure

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I have a 98 Sonoma GMC pickup.  About 4 weeks ago the wipers started turning off by themselves during rain storms.  The dealer I went to cannot replicate the situation and is advising that I install a new circuit board ($300) without any guarant