| 摘要 |
<p>Pneumatic controller for vacuum brake servos comprising, within a piston (5), a tubular sealing element (21) which cooperates with a stationary seat (18) and a movable seat (19) and defines, within the piston (5), a chamber (22) with an opening (23) passing therethrough, linking it to a channel (20) between the two seats. The chamber (22) is defined only when the brake servo is in the operating position, thereby reducing the hysteresis of the latter.</p> |
