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Someone else had informed me that this light also comes on if the brake fluid is low. I added fluid to my '97 T-100 and it solved the problem.

I have a 97 T-100 with the same problem. While I can't tell you for certain what is causing the problem, I suspect the switch also, and will be replacing it soon. The switch is located under the dash near the firewall, where the tip of the parking brake rod connects with it. To test whether your problem is merely an adjustment issue, pull the parking brake, then reach the switch and depress the button on top. If the light goes off, it just needs adjustment. If not, it is probably the switch. To further check, disconnect the wiring harness connection and run a jumper wire between the two posts of the connector. If the light goes out, replace the switch.

this could be caused by just a loose wire touching and making a connection or it could be a small short due to some other reason

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Q: What are possible causes for the parking brake light coming on and off sporadically on a 1994 t100 Where is the switch could it be sticking?
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