I noticed my rear brakes on my motorcycle making noise today. By the time I got home the rear rotor was a tad roughed up. It‘s not too bad but I was wondering if it‘s necessary to have it turned before putting on the new pads?
No do not turn motorcycle rotors if you need to replace them.
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First you have to identify why it was roughed up – it is no good to solve the wrong problem or one that does not exist. All discs will mark to some degree if they are used on a road bike, all things are relative so your “tad” might be different from mine, unless there are deep* grooves and the width of the disc is within manufacturer’s tolerances, you can clean it and leave it. It is possible to have discs turned but is really only sensible in the case of classic bikes where an OE replacement is impossible to find (that level of restoration does not often get ridden except on sunny days for a few miles, if at all). * your “deep” is probably different to mine too. EDIT: Grooving is probably (if everything else is within tolerances) caused by grit from the road being trapped between pad and disc – not a great deal you can do about it, short of not riding. You can clean brake discs with brake and carb spray on cleaner – it is non-oily and evaporates quickly, but that will not clean up the caliper to do that you have to remove the caliper, clean the pads and pistons. A wire brush may be necessary to clean up the surface of the disc. If the pads have worn down beyond the groove cut in the face then they will need to be replaced, apart from cosmetic reasons it does not sound necessary to replace the discs – and remember new pads take time to bed in, they will not be at their most effective until they have been used several times.
