Pneumatic brake servo and system including a master cylinder connected to such a servo

Servomotor includes snap-fit attachment (46) used to secure master cylinder to servomotor. Snap-fit attachment includes tabs (52) integral with coupling (48) attached to servomotor, and extending radially from coupling. Tabs are deformed so as to enter passage in flange in master cylinder and secure servomotor to master cylinder. An independent claim is also included for the braking system comprising master cylinder.