Brake booster

A brake booster assembly of a vehicle having a dash board and a brake pedal comprising:

• a housing;
• a brake master cylinder connected to the housing;
• a diaphragm power piston positioned in said housing and dividing the housing into first and second fluid chambers and having a retracted position defined by abutment with the housing;
• a control valve mechanism for the diaphragm power piston for controlling a pressure differential between the chambers in response to movement of said brake pedal axially relative to the power piston;
• and
• at least two bolt members which extend from the master cylinder bypassing outside of the housing to said dash board of said vehicle for installation such that a brake reactional force is transmitted from the master cylinder to the dash board bypassing the housing wherein the housing is contoured so as to have a pair of recessed portions located symmetrically with respect to the center of the housing and the two bolt members pass through the recessed portions from the master cylinder to the dash board with both ends in thread and nut connection with the master cylinder and the dash board, respectively, whereby the housing is clamped between the master cylinder and the dash board.