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Initial, light corrosion can be cleaned off under reasonably heavy braking, but if left, this light corrosion gets worse and can lead to surface pitting. Pitting used to be a reason for MOT test failure, but now discs should only fail the test if they’ve become ‘seriously weakened’.Click to see full answer. Similarly, it is asked, do scored brake discs need replacing?The answer is YES. For example, the brake discs do not need to be changed if the car is relatively new and there is still a lot of disc life left. They absolutely need to be changed if the discs are unevenly worn or badly scored.Beside above, are worn brake discs an MOT failure? As an example, a loose brake disc will be a dangerous defect, a brake disc worn to below the minimum thickness will generally be a major defect and both of these will mean the car fails the MOT test. If any of the tyres look underinflated, the car will fail the test, so check the pressures. Subsequently, question is, are pitted brake discs an MOT failure? Pitting used to be a reason for MOT test failure, but now discs should only fail the test if they’ve become ‘seriously weakened’. Surface corrosion or pitting of discs isn’t a ‘fitness for purpose’ or warranty repair issue, as it mainly depends on how the vehicle is used and stored.How long should brake discs last?A set of brake pads can last from anywhere between 25,000 and 60,000 miles – possibly more. A major factor in the lifespan of the pads is down to the way the vehicle is used and driven.

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