Not 100% familiar with the 92 dash cluster however, if you are having a brake problem, there may be an indicator light showing on the dash cluster. I think thats what Fuddy meant.
Maybe you mentioned this...not sure, do you have ABS?
ABS systems have speed sensors ( I remember willwren mentioned something about this) If you don't have ABS, then it must be something else. Also checking the brake fluid levels might be good too.
Basically the cluster is an idiot read out device, methinks its something else is not feeding the cluster correct information and its wonkin out on ya
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