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Yozh...what type of "check valve" is located in the brake booster that fails to keep vacuum inside the system.
The only two parts that I'm aware are just gaskets (rubber gaskets).
One is this one ( 34311160617 ), it seals the master cylinder going inside the brake booster.
The second one ( 34336765316 ), is seals the vacuum pipe going inside the brake booster.
Am I missing something or am I mistaken?
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