When brake pedal is pushed by the driver, brake fluid is forced into the brake cylinder by the action at the master cylinder, and the two pistons are forced outward.
当驾驶员踩下制动踏板时，制动液由于主缸的作用进入轮缸，推动两个活塞向外侧移动。
When brake pedal is pushed by the driver, brake fluid is forced into the brake cylinder by the action at the master cylinder, and the two pistons are forced outward.
当驾驶员踩下制动踏板时，制动液由于主缸的作用进入轮缸，推动两个活塞向外侧移动。
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