Brake snap spring mounting device and mounting method

The invention discloses a brake snap spring installation device and method, the installation device comprises a stepped limiting shaft with the diameter being large in the upper portion and small in the lower portion, a through hole is formed in the upper portion of the limiting shaft in a radial penetrating mode, and a pin shaft facilitating operation of the limiting shaft is assembled in the through hole; a large-diameter upper shaft at the upper part of the limiting shaft is in small clearance fit with the inner wall of the brake piston; a small-diameter lower shaft at the lower part of the limiting shaft is also in small clearance fit with the inner wall of the brake regulator sleeve; a clamp spring clamping groove penetrating through a shaft body is axially formed in the side face of an upper shaft of the upper portion of the limiting shaft. A circular groove type cavity inserted into a small sleeve opening in the upper portion of an adjuster sleeve of the brake is upwards formed in the connecting positi