Parking cylinder and brake

The invention relates to the technical field of railway vehicles, and particularly discloses a parking cylinder and a brake. The stopping cylinder comprises a cylinder body, a ratchet wheel and a locking claw which are rotatably arranged relative to the cylinder body, and a first relieving device connected to the cylinder body, the locking claw is arranged on one side of the ratchet wheel, the first relieving device comprises a mounting seat, a piezoelectric actuating assembly and a displacement amplifying assembly, and the mounting seat is connected to the cylinder body and located around the ratchet wheel; the piezoelectric actuating assembly is provided with a first end part and a second end part which generate far displacement when being electrified, the first end part is fixedly arranged relative to the mounting seat, and the displacement amplifying assembly is arranged between the second end part and the locking claw so as to drive the locking claw to rotate by amplifying the displacement generated when