Assembly in a disc brake system fitting over the disc and containing the pistons which act on the brake pads, which in turn press on the disc.

在盘式制动系统中跨刹车盘而安装的总成。包含有作用于刹车片的活塞，使刹车片能压紧到刹车盘上。

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Mike Jempson, the director of the PressWise Trust, an independent body which helps people who have had problems with the press, says the system still favours the rich over the poor.

BBC: Battle to raise standards

Pentagon officials promised to press forward with plans for more tests of the system after an interceptor missile hit a dummy warhead over the Pacific Ocean on Saturday.

BBC: Russia and China sign friendship pact

The initial system of launch is invite only to members of the press, and will be tested with user feedback over time to gauge how to expand.

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