久久伊人五月丁香狠狠色,国产AV午夜精品一区二区入口,日韩丰满少妇无码内射,99久久国产宗和精品1上映

Vacuum brake system pipe

Used in automobile brake booster pipeline has good sealing, connects to the brake booster pump, for work to provide vacuum pump membrane, on the other side and atmosphere are interlinked, using atmospheric pressure driven push rod to move forward, have assisted effect.