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You can determine if the ABS hydraulic control unit is bad by observing warning lights on the dashboard, particularly the ABS warning light. Additionally, if you experience abnormal braking behavior, such as the brakes not engaging properly or locking up during sudden stops, this may indicate a malfunction. Diagnostic tools can also reveal error codes related to the ABS system, providing further evidence of a faulty hydraulic control unit. Lastly, physical inspection for leaks or damage can help confirm the issue.

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