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What are the reasons for the hard brake pedal in Sylphy?

2 Answers

RowanFitz

07/29/25 6:53pm

Sylphy brake pedal hard to press down may be caused by vacuum booster pump failure or dirty brake fluid. Vacuum booster pump failure: The reason why the Sylphy's brake pedal is hard to press down is due to vacuum booster pump failure. During braking, the vacuum entering the booster pump is controlled to move the diaphragm, and through the linkage device, the push rod on the diaphragm assists the driver's foot force to press and push the brake pedal, thereby amplifying the force applied by the driver. If the car's vacuum booster pump leaks or malfunctions, the brake will lose its main force, making it difficult to press down. The solution is to promptly take the vehicle to a repair shop for inspection and replace the vacuum booster pump to prevent accidents. Dirty brake fluid: Dirty brake fluid can lead to poor braking performance or increased stopping distance. The boiling point of brake fluid decreases, making it prone to boiling in the brake lines and generating bubbles, which significantly reduces braking effectiveness. Additionally, long-term accumulation of dirt can clog the lines. The solution is to regularly replace the brake fluid.

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EloiseMarie

08/14/25 12:37pm

Last time I drove my old Sylphy, I also encountered the situation where the brake became hard and couldn't be pressed, which really scared me. Later, the repair shop said it was due to a leak in the vacuum booster pump, which is specifically designed to assist the brakes. Another possibility is that the brake fluid hasn't been changed for a long time, and excessive water content can easily create bubbles, affecting the boosting effect. Also, check if there's something like a drink bottle stuck under the pedal. I've seen cases where a water bottle rolled in and got stuck under the brake pedal. Additionally, if there's a crack in the brake vacuum hose, the engine's negative pressure can't be transmitted, making the brake feel heavy. For Sylphy models of this age, aging of the booster seal is quite common. If you feel the brake pedal becoming hard, don't force yourself to keep driving.

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