The size series, parameters, calculation of effective area, requirements of sealing and assembling etc. of the diaphram type air brake Chambers are presented.

介绍了膜片式气室的尺寸系列及参数、有效面积的设计、密封要求和装配等方面的内容。

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Preparation before working: observe whether the area is accord with requirements before working. Pull on parking brake after parking.

作业前的准备：作业前要观察场地是否符合要求。停车后要拉上驻车制动器。

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Whichever method is used, and finally the need to brake drum brake shoe and the contact area for more than 70%.

无论采用哪种方法，最后必须使制动鼓与制动蹄的接触面积达到70%以上。

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The cause of the crash is not yet clear, but California Highway Patrol spokesman Mario Lopez was quoted by the Associated Press as saying that the bus driver reported brake problems as he descended a road leading from the Big Bear ski resort area.

BBC: California bus crash kills eight and injures dozens