Originally posted by 3wheels3
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Sorry for my delayed response, been busy with the Autosport show over the last few days.
We say that a disc needs replacing if there is over 1mm of wear.
Or if a visually check shows that the majority of the slots/grooves/dimples are worn away this will result in uneven surface decreasing performance and increasing the chance of failure/cracking.
Regards,
Charlie

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