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Re: loose wire by brakes and query with caliper bolts
One of the golden rules when working with brakes is only work at one side at a time - leave its opposite undisturbed as it gives you something for comparison.
Nothing stopping you trying the bolts first though - just remember once loosened the the threads will need a new coat of lockite.
Even though the wiring may be present for wear indicators not all models have the facility so I wouldn't be too concerned and no it won't be an MOT failure.
Currently in madnoel10's garage:
Honda Civic 1.4l