This type of caliper moves along its mounting bolts bushings.

The correct answer relates to a specific mechanism of a caliper used in braking systems. A sliding caliper operates on the principle that it is mounted onto a fixed position and actually slides back and forth along its mounting bolts or bushings. This movement allows the caliper to adjust its position relative to the brake rotor, ensuring even clamping force on the brake pads as they press against the rotor.

In contrast, a fixed caliper does not slide; it stays in a fixed position and has pistons on either side of the rotor, which apply pressure to the brake pads. The floating caliper, while it includes some movement, is typically designed to slide only on one side along the bolts or bushings, pivoting in the middle to adjust the brake pad's contact with the rotor. As such, identifying the specific type that slides along its mount more directly aligns with the definition of a sliding caliper.

Thus, a sliding caliper is correctly identified as the one that moves along its mounting bolts bushings, allowing it to act effectively on the rotor when brakes are applied.