The brake wheel cylinder has a simple structure, which is convenient for the piston brake shoe opening mechanism used in the hydraulic brake system configured on the wheel brake. The body of the wheel cylinder is made of gray cast iron HT250. The cylinder is through-hole, boring and requires grinding. The piston is made of aluminum alloy. The outer end of the piston is pressed by a grooved steel top block to support the end of the brake shoe inserted into the groove or end joint. The working chamber of the wheel cylinder is sealed by a rubber sealing ring supplied on the piston or by a rubber cup inclined towards the internal end surface of the piston. Most brake wheel cylinders have two pistons of the same diameter. This disc brake is driven by a single piston wheel cylinder.