For brake booster leakage test, we should do the below procedure

汽車修護 · 乙級 · 專業英文及手冊查閱 · Q42

install the vacuum gauge between booster and check valve

start the engine and keep the engine running at all time

read the vacuum gauge

make sure vacuum reading should not decrease within 30 sec

4 / 5

因為是多選題且包含需細部辨別的陷阱，必須同時正確判斷多個程序的正確性，認知難度較高。

① install the vacuum gauge between booster and check valve:煞車倍力器洩漏測試需將真空錶安裝於倍力器與單向閥之間，此為量測真空管路密封性的標準程序。
③ read the vacuum gauge:讀取真空錶數值是判斷倍力器內部膜片及管路是否洩漏的關鍵步驟，需準確記錄初始真空度。
④ make sure vacuum reading should not decrease within 30 sec:標準規範要求真空讀數於30秒內不得下降，若壓力衰退即代表倍力器本體或單向閥存在洩漏。

② start the engine and keep the engine running at all time:測試時應先啟動引擎建立真空後關閉引擎，若持續保持引擎運轉會因進氣歧管持續產生真空而掩蓋洩漏現象，無法正確判斷密封性。

"煞車倍力器洩漏測試的核心考點在於測試時必須關閉引擎後觀察真空保持狀況，此為最易混淆的陷阱。實務上若真空無法維持，常見原因為倍力器膜片破損、單向閥失效或真空管路老化龜裂，檢定時需特別注意測試步驟的正確順序。"

①install the vacuum gauge between booster and check valve0%

②start the engine and keep the engine running at all time0%

③read the vacuum gauge0%

④make sure vacuum reading should not decrease within 30 sec0%

此答題分佈是根據學員在 LongePass 模擬考等實際作答紀錄計算而成。與考友分享這道歷屆試題與詳細解析！