How often should the brake fluid in an A4L be replaced?
2 Answers
The brake fluid in an A4L should be replaced approximately every 20,000 kilometers or every two years. Over time, the rubber cups and pistons in the brake pump can wear out, causing the brake fluid to become contaminated, hence the need for regular replacement. When selecting brake fluid, it is important to pay attention to its quality. Substandard brake fluid can corrode the rubber seals in the brake pump, affecting braking performance. Therefore, it is recommended to purchase the original brake fluid from authorized repair shops for better assurance. The new Audi A4L features a completely redesigned exterior and chassis, with front and rear designs that closely resemble the Audi A5. While the A4L is not considered a luxury sedan within the Audi lineup, its front fascia adopts a sports car design style, reflecting Audi's high expectations for the A4L.
I've been driving my A4L for three years, and the maintenance manual clearly states that the brake fluid must be changed every two years. Last time at the 4S shop, the technician mentioned that due to high humidity in the south, brake fluid absorbs moisture, which lowers its boiling point. This could lead to vapor lock during emergency braking, reducing braking power. In reality, it depends on driving habits. If you frequently drive on mountain roads or engage in aggressive driving, it's advisable to check the moisture content around 30,000 kilometers. Don't just rely on mileage; even if you drive less, change it when the time comes, as aging rubber seals can contaminate the fluid. You can notice signs like a softer brake pedal feel or increased stopping distance, but it's best to use a professional moisture detection pen for accurate measurement.
