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The brake pressure sensor is part of the brake controller and will have to be replaced as a complete control unit assembly. If the brake lights are working then you have eliminated half of the toyota fault tree diagnosis and the most likely cause would be a failed control unit. Do you have a scan tool that will show the data stream from the brake pedal switch?
Let me see. I'll send the fault tree diagram from Toyota.
You could test for voltage at the connector:
Please let me know if you need additional info.
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