Intermittent rubbing of the bicycle disc brake each turn of the wheel usual indicates that the disc brake rotor is bent or is “out of true.” If we look down at the rotor, we can see it rub against the brake pad as we rotate the bike wheel. Let see how we can fix this.
Before you begin working on the disc brake rotor, release the quick release or through axle and make sure the wheel is fully seated in the drop outs and the quick release or thru axle is tight. Next make sure the rotor bolts are tight, being careful in that the rotor is very sharp. Also check that the bolts of your mounting hardware are tightly in place. If this doesn’t solve the problem, the rotor may be bent. This could be a result of “overheating” when the brakes are constantly applied or the result of a crash.
DIY: Try to get a good look at the rotor between the brake pads and also listen. If the rotor is out of true, you’ll see and hear the rotor intermittently hit the brake pad. Here’s how to true the rotor.
It is important to keep the rotors free of any grease including that from your hands so I suggest using some nitrate gloves. To straighten the rotor, we'll need several items. A black marker pen and either an adjustable wrench or something like the Park Rotor Truing Tool which we have here. If you use an adjustable wrench or plumbers wrench, make sure it's clean and free of grease and grime.
Mark the rotor (away from the part that come in contact with the pads) with the marker to keep track of where it is rubbing. Use your Park rotor truing tool or adjustable wrench to bend the rotor ever so slightly away from the pad where it rubs (either inward or toward you). Keep working you're way around until the rotor applying very light pressure with your tool.
Work very slowly, noting where the rotor is rubbing and use just a very minimal pressure to just slightly bend the rotor. Note the markings so after a test spin, you can go back to the same area (or another) if necessary. Repeat until the rotor no longer makes contact with the pads.
If you can true the rotor or if it's really "wavy," you may have overheated the rotor or it got severally bent due to a crash or from a rock and you should probably replace the rotor.
Checking bicycle noise can lessen wear, prevent on the road disasters, and improve performance. It should also be part of your maintenance routine.
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