Abstract: A vacuum brake booster is coupled to a master cylinder at the same time that an output member for the vacuum brake booster is adjusted relative to a piston for the master cylinder. The adjustment is carried out by a plunger adapted to activate a bonding material for bonding the plunger to the output member.

Abstract: A hydraulic brake booster (10) includes a spring-balanced control valve (42) communicating pressurized fluid to a pressure chamber (14) in response to an operator input. The magnitude of the fluid pressure communicated to the pressure chamber (14) is a function of the balance of spring forces applied to the control valve (42) by a pair of opposed springs (50, 82). An adjustable assembly (92) engages one of the opposed springs (50, 82) so that the balance of spring forces applied to the control valve (42) may be adjusted to limit to a safe level the maximum fluid pressure communicable to the pressure chamber (14). The adjustable assembly (92) includes a pair of relatively-rotatable members (106, 108) which each define oblique cam surfaces (122, 124) engaging the other member. One of the members (106) engages one of the opposed springs (50, 82). The other member (108) includes an elongate stem (118) terminating in an end (120) external of the booster housing (12).

Abstract: A pedal adapter for maintaining the connection between a push rod and a brake lever in a plane perpendicular to and at a fixed radius from a pin. The lever adjacent the pedal adapter is offset at an angle to avoid interference with a stationary member.

Abstract: A muffler for absorbing the noise created by air flowing around a cylindrical body and into the interior thereof by maintaining a predetermined cross sectional area through which the air can freely flow.