![]() The brake you were sent appears to be a BR-MT520, which is a good part. A good generic replacement point thickness is 1.5mm, unless the manufacturer says otherwise. Losing a lot of rotor thickness also impacts heat management. ![]() When the rotor surface gets chewed up to match, you may not be able to get back to good, smooth brake feel. There can be a grey area there but the wear into the backing plate shown is fairly extreme. Excess heat can create the kind of exponential wear that would explain the situation.Īny rotor that's had extensive contact with the backing plate from pad wear is liable to never work great again. Conversely, if one was relying heavily on the back brake, wear like in the picture can happen very quickly on an ebike, especially on an organic/resin pad and even more especially on a low-quality one. You could say that the ideal braking habits are a balanced amount of pressure on the levers with a bias towards the front. The front brake is much more effective at stopping the bike for a given amount of wear expenditure, up until it gets too hot. You want to be using the front as much as possible within the bounds of safety and heat management. The balance of usage between the front and rear brake may also be a factor. Unbranded hydros on DTC ebikes are often total garbage, so rapid wear isn't necessarily surprising.
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