Disc brake pads for a caliper with 2 pistons, front, for Storm, TMMP, China. The pads clamp the brake disc and slow the wheel; they are selected to match the shape and type of the caliper.
Replace them when the friction material is worn to the minimum, if the brake has become "dead", if squealing and grinding have appeared, or if grooves are visible on the disc. Replace the pads on the axle as a pair and compare their shape with the old ones: the number of pistons and the "ear" must match.
