| 摘要 |
<p>The master brake cylinder has a double piston seal, with the outer seal (4) protecting a trapped volume (5) between the seals. The cylinder wall in the trapped volume has spiral grooves (9) to trap some hydraulic fluid for lubrication. The trapped fluid ensures that the outer seal does not dry out and wear away. The amount of fluid loss through the seapage into the grooves is too small to affect the safe operation of the master brake cylinder.</p> |
