AUTOMATIC SERVO BRAKE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an automatic brake servo device with a valve mechanism constituted simply for increasing reliability. SOLUTION: A valve mechanism is provided with a vacuum valve seat 16 formed toward a front side in a valve body 6, an atmosphere valve seat formed toward rear side of a valve plunger 18, and a valve element seating on the both valve seats from the front side. The valve plunger 18 is provided with a solenoid plunger 50 which goes through the valve plunger 18 for a relative displacement, and is connected integrally at the forward end position. An elastic member 52 is provided to normally hold the solenoid plunger 50 at the forward end position.