Main cylinder, for a vehicle hydraulic brake, has a sliding piston forming a gap between its surface and the seal when moving against the operating direction to prevent an abrupt equalizing on an underpressure

摘要

The main cylinder (10), for a vehicle hydraulic brake, has a sliding piston (18) within a cylindrical passage (14) in a housing (12). When the piston slides against the operating direction (B), a gap is formed between the outer piston surface (42) and the seal (32).