可以自查看看brake booster是不是坏了！（链接有如何自查）
needtime
2018-11-02 19:33:12
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www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-power-brake-booster
www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-power-brake-booster