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Q: brake pressure switch on 1990 GMC Suburban 1500

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The brake service light stays on all of the time. Is this an indication of a bad pressure switch? I notice that there is a "port" on either side of the pressure switch, what are these for?
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First, check your brake fluid level, if it is low that will set the light. If the fluid level is ok, then it can be several things. Have a good shop Diagnose this issue to be safe.

here are some shops http://repairpal.com/directory?address=80631&car_brand_names=GMC
if you dont know , dont mess with it. too many people kill others thinking they know how to fix critical systems.. besides you'll live longer if you do take it to a real break shop or the dealer..
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