After riding for half a year, CT sent the TIME road bike to曜越單車 (Thermaltake Bike) for maintenance, and specially documented the rare professional procedure—the dual-hole disc brake facing tool operation. Many cyclists suffer from rotor rub noise, often caused by excessive paint thickness or uneven tolerances on the frame's caliper mount. The camera closely captures the technician locking the specialized facing tool onto the frame and fork, manually cutting and flattening the metal contact surface. The contrast between the rough and the smooth, shiny metal before and after cutting is striking, and the tolerance adjustment and free-spin smoothness after reinstalling the caliper are breathtaking. Can facing completely solve the rotor rub nightmare? The details of this procedure are a must-see for disc brake owners.