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CAT 236B Going into Park Mode - Repair Manual

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Not sure how these work for the brake, but it could be a bad hold coil? If it's coming off, I would doubt it's the computer. I would suspect a solenoid or even a bad connection.

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Check the wiring connections to the parking brake solenoid. Sometimes corrosion or a loose connection can cause intermittent issues.

I had a similar issue with mine. Turned out to be a faulty seat switch that was intermittently disengaging.

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