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How to solve the occasional hard brake issue in Cruze?

2 Answers

MacConnor

07/25/25 10:06am

If the brake of a Cruze becomes hard, it is usually caused by a malfunction of the vacuum booster pump. In such cases, check for air leaks in the vacuum valve on the intake manifold, promptly replace the brake fluid, inspect the brake pads, or replace the vacuum booster pump with a new one. When the driver presses the brake pedal, the vacuum booster pump provides assistance. After pressing the brake pedal, the master cylinder pushes the brake fluid to actuate the wheel cylinders, which then press the brake pads against the brake discs, allowing the car to decelerate. The braking system is crucial for a car, as it directly affects driving stability and safety. The brake fluid in the system needs to be replaced regularly because it is highly prone to absorbing moisture. If the brake fluid's moisture content is too high, it can reduce braking force and increase stopping distance. When the moisture content reaches 3%, the brake fluid should be replaced immediately. After replacing the brake fluid, the air in the brake system lines must be bled out; otherwise, it will affect braking performance and stopping distance. During routine maintenance, always check the moisture content of the brake fluid. Additionally, regularly inspect the remaining thickness of the brake pads and the condition of the brake discs. If the brake pads are too worn, they should be replaced immediately to ensure driving safety.

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HarperFitz

08/11/25 7:33pm

I've experienced the brake pedal feeling hard and unassisted a few times while driving my Cruze, which was quite scary. Later, I took it to a repair shop and found out it was due to a leaking vacuum booster pump. Replacing the sealing ring fixed the issue. Such problems are commonly caused by aging or damage to the vacuum lines, leading to loss of power assistance. Pay attention to the brake pedal feel while driving; if it occasionally feels hard, get it checked immediately—don't wait for a major issue. If you know a bit about cars, you can pop the hood and check the vacuum lines for cracks, but it's best to leave professional work to the technicians. Safety first—address the issue early to avoid rear-end collision risks.

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