求翻译：盘式制动器的缺点　　 （1）效能较低，所需制动促动管路压力较高，一般要用伺服装置；　　 （2）兼用于驻车制动时，需要加装的驻车制动传动装置较鼓式制动器复杂。是什么意思？

Defects (1) of the disc brake performance is low, a brake line pressure to motivate high, generally use the servo device; (2) and used for the parking brake when you need to install the parking brake transmission complex device than the drum brakes.

Disc brake defects (1) effectiveness is low, the brake actuator line pressure is high, in general you want to use servo unit; (2) and used for the parking brake, when you need to reload the park brake drive more complex drum brakes.

Disc brake shortcoming　　 (1) potency is low, must apply the brake the actuation line pressure to be high, must use the servo unit generally;　　 (2) concurrently uses in when applies the brake in the vehicle, needs to install in the vehicle brake drive installment compares the drum brake to be complex

Disadvantages of disc brakes (1) effectiveness of low brake pipe pressure required is high, typically used in servo device, (2), and when used with parking brake, you need to install more complex drum brake parking brake transmission device.

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