This document describes the features and characteristics of the servo-controlled two-stage brake cylinder. This type of cylinder is a direct-action type with compact size and double-layer seal. The fluid of the brake circuit and servo circuit is separated by a space isolation layer, which is equipped with a sintered filter. The cylinder can be installed horizontally and is suitable for mineral oil and brake fluid. It has a maximum brake pressure of 150bar and a working temperature range of -20°C to 100°C.