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Will the air inside be expelled after changing the brake fluid?

1 Answers

VonSebastian

07/25/25 4:11am

After changing the brake fluid, the air inside generally will not be expelled automatically. However, if the brake fluid replacement is not performed skillfully, it is advisable to bleed the air out. Otherwise, trapped air may affect the braking performance during operation. Brake fluid performance: Brake fluid, also known as hydraulic brake fluid or mineral oil brake fluid, possesses properties such as oxidation stability, anti-foaming characteristics, rubber swelling resistance, and rust prevention. Brake fluid replacement: The replacement interval depends on the vehicle's braking usage during driving and the condition of the braking system. Since brake fluid is hygroscopic (absorbs moisture), prolonged failure to replace it will reduce driving safety. For vehicles with frequent usage, brake fluid should be replaced approximately every 30,000 kilometers. For less frequently used vehicles, the replacement interval can be extended accordingly, typically between 50,000 to 60,000 kilometers.

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