Hydraulic brake master cylinder for vehicle

摘要

The oblong housing (12) of the cylinder (10) contains a pressure chamber (14) with an opening towards the actuating end sealed by a filler section (28) formed by a coaxial piston and chamber. In the initial phase of actuation this rapidly fills the system with hydraulic fluid. The filler piston and chamber (32) are formed by a cup-shaped component (30) sliding telescopically on the housing actuating end. This component can be mechanically coupled to a piston (16) in the master cylinder, operation of the filler section being controlled dependent on the length of actuating movement. There can be a control cam in the pressure chamber extending in the peripheral direction and which works on actuation with a similarly-extending seal, so that after a predetermined length of actuating movement the filler section is cut out of use.