MTBs can be equipped with mechanical brakes (with the classic steel cable that drives the brake pads) or MTB hydraulic brakes in which the control levers, instead of exerting traction on a cable, act on a small pump that pressurises the oil in the braking circuit. As it is incompressible, the oil exerts the same pressure on the pistons contained in the brake caliper, which transfers it to the pads that perform the braking. The two systems are both valid, but the hydraulic systems are preferred by MTB enthusiasts because they respond particularly quickly, are reliable and offer great braking force control modulation. Naturally, they also require maintenance, which basically involves doing two things: replacing the pads and purging and replacing the braking fluid that degrades with the brakes’ intense use. In addition, air bubbles form in the circuit that reduce the braking effect.