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How to Fix Air Leakage from the Brake Master Cylinder Vent?

1 Answers

SanAutumn

07/30/25 8:25am

Methods to repair air leakage from the brake master cylinder vent: 1. Remove the master cylinder and clean it thoroughly, then inspect the air shut-off valve for any cracks. If cracks are found, apply some grease at the cracked area and reassemble it properly; 2. Install air filters on the two branch pipes leading to the master cylinder to solve frequent air leakage issues, and purchase a repair kit for the same model of the master cylinder; 3. If the leather cup of the master cylinder is leaking, it needs to be replaced entirely. When pressing the brake pedal, if you notice the braking feel is significantly softer and the stability of continuous braking decreases, it might indicate poor sealing of the master or slave cylinder pistons, or a crack somewhere in the brake lines causing oil leakage.

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