Abstract: The master cylinder comprises a body (12) defining a primary pressure chamber (14) and a secondary pressure chamber (16), separated by a secondary piston (20); means (24) for the hydraulic connection of the primary pressure chamber (14) with braking-force simulation means (26); moving and stationary means (28, 30) for the sealing of the hydraulic connection means (24) and borne by the secondary piston (20) and the body (12) respectively. The piston (20) is axially movable between a rest position, in which the moving and stationary sealing means (28, 30) are spaced apart from each other, and a position in which said moving and stationary sealing means (28, 30) are cooperating with each other. A moving stop (34) and a stationary stop (32), borne by the secondary piston (20) and the body (12) respectively, cooperate with each other so as to define, the rest position of the secondary piston (20).

Abstract: This master cylinder comprises a body (12) defining a primary pressure chamber (14) and a secondary pressure chamber (16), separated by an axially movable piston (22), the so-called secondary piston; means (28) for the hydraulic connection of the primary pressure chamber (14) with braking-force simulation means (30); and complementary moving and stationary means (32, 34) for the sealing of the hydraulic connection means (28). The moving and stationary sealing means (32, 34) are borne by the secondary piston (22) and the body (12) respectively. The secondary piston (22) is axially movable between a rest position, in which the complementary sealing means (32, 34) are spaced apart from each other, and a position in which said complementary sealing means (32, 34) are cooperating with each other.