maybe it is the booster. The booster is used to pump up the bra

回答: 踩刹車時有漏氣的聲音老車費錢2010-10-26 16:26:06

after you apply it.  When it is broken, the brake padel will be back up after you press it. The gas sound maybe be caused by a leaking booster.

Have it checked out by a repair shop.  They should tell you the root cause.

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