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CDV(clutch delay valve)
離合器延遲閥 (CDV) 是一種單向限流器，位於離合器從動缸和離合器主缸之間。它會減慢離合器的接合速度，類似於阻尼的唱機唱臂，輕輕地將指針降低到唱片的表面。
https://www.zeckhausen.com/catalog/index.php?cPath=6562
換句話說，就是自動的讓你緩緩的放離合器。這對於離合器片是一種保護，但換檔感覺就沒那麼直接，所以很多老Bimmer都會把CDV移除!
bmw e世代車系的cdv是另外加裝一個單向閥，但F世代已經整合在離合器總幫內，需要自己挖出來
