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How Often Should Brake Fluid Be Replaced in a Car?

1 Answers

VonEmersyn

07/30/25 1:08am

Brake fluid in a car is typically replaced after the vehicle has been driven for 40,000 kilometers or after continuous use for more than two years. The following are the reasons for replacing car brake fluid: 1. Emulsification and deterioration: Expired brake fluid gradually undergoes emulsification and deterioration, during which some bubbles are generated. These bubbles accumulate in the pipelines and cannot be released, forming air resistance that affects the normal transmission of hydraulic pressure, leading to reduced braking efficiency or even failure. 2. Hygroscopicity of brake fluid: Brake fluid has strong hygroscopicity. Over time, absorbed water lowers the boiling point of the brake fluid, resulting in insufficient brake pressure and affecting braking performance.

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