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    My 2015 Isuzu MU-X keeps showing a 'release park brake' fault

    Isuzu Isuzu Advice Isuzu MU-X Isuzu MU-X Advice Isuzu MU-X 2015
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    My 2015 Isuzu M-UX keeps coming up with a ‘release park brake’ fault. The park brake is down and I have had the wiring harness replaced, but the fault continues to return. Any ideas?

    Answered by CarsGuide
    24 January 2025
    David Morley

    Unlike some newer cars which use an electrically-operated park brake, this model Isuzu has a conventional, mechanical park brake set-up. So that’s a good start as the mechanical version is much simpler.

    The tiny switch that is operated by the park brake lever (and lights up the warning light) can often fail or short-circuit, leaving the car thinking that the park brake is still applied even though it’s not. But if you’ve gone to the trouble of changing the wiring to the park brake lever, then presumably this switch was replaced, too. Or at least checked.

    So the next thing to do is to make sure that the park brake is, indeed, releasing completely when you lower the park brake lever inside the cabin. If the park brake is poorly adjusted, you might find it’s not releasing all the way, and that’s what’s causing the problem. A quick squirt of contact cleaner on the switch would be your first move, however.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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