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What Are the Reasons for the Brake Pedal Being Hard to Press When Starting the Car?

2 Answers

OChloe

07/29/25 6:23am

Here are the reasons why the brake pedal is hard to press when starting the car: 1. The car's vacuum booster pump is leaking or malfunctioning. The force applied to the brake pedal is amplified by the brake booster pump. If it fails, the brake loses its assistance, making it difficult to press. 2. The brake pedal was pressed after the engine was turned off. This is also related to the brake booster pump. The brake booster pump continuously generates vacuum only when the engine is running. When the engine is off, it relies on the residual vacuum, which typically allows only a few presses before becoming hard to press. 3. It could also be due to a lack of necessary maintenance in the brake system, such as excessive impurities in the brake master cylinder, poor sealing, failure of the vacuum booster pump, contaminated brake fluid, or mixing different types of brake fluid causing vapor lock when heated, leakage in the brake master cylinder or wheel cylinders, or leaks in the air reservoir or pipe connections.

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OEmery

08/12/25 9:50am

I've experienced this situation a few times when starting the car—the brake pedal becomes hard to press. This is mainly due to the function of the vacuum booster. Before the engine starts, the vacuum system lacks a pressure source, causing the brake assist to fail, which makes the pedal stiff and difficult to depress. This is especially common during cold starts or after prolonged parking and is considered normal. However, if the pedal remains stiff after starting, the issue might lie in a vacuum pump leak, cracked or clogged pipes. Last time I checked myself, I noticed signs of aging in the hose—replacing it fixed the problem. I recommend gently pressing the brake pedal a few times before starting; sometimes this can help the system recover. If it happens frequently, promptly inspect the vacuum components to avoid being caught off guard in emergencies. Safe driving isn't something to take lightly—regular maintenance of the braking system is key. Don't wait until problems arise to regret it.

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