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What is the reason why the brake pedal of the LaCrosse cannot be pressed down when starting?

4 Answers
AuroraMarie
07/29/25 10:56pm

The reasons why the brake pedal of the LaCrosse cannot be pressed down when starting are as follows: Failure of the vacuum booster pump: If the vacuum booster pump is damaged, it will cause the brake pedal to become very heavy and difficult to press down. The damaged vacuum booster pump needs to be replaced immediately, otherwise it will affect the normal operation of the braking system. The braking system is a very important system in a car, as it is related to the driving stability and safety of the vehicle. Too many impurities in the master cylinder: Excessive impurities in the brake master cylinder, poor sealing, failure of the vacuum booster pump, or dirty brake fluid. Air leakage at the pipeline interface: Air resistance caused by mixing brake fluid and heating, leakage of the brake master cylinder or wheel cylinder, or air leakage at the air reservoir or pipeline interface.

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MilaRose
08/16/25 12:36am

As someone who has driven for many years, I think the most common reason for not being able to press the brake pedal is a faulty vacuum booster. When the engine is off, the booster uses engine vacuum to help you step on the brake easily. Once that thing fails, such as a leak in the hose or internal malfunction, the pedal becomes as hard as a rock. I've encountered this a few times, all related to aging rubber hoses; regular maintenance and avoiding driving in sandy areas can prevent this. If you can't press the pedal after starting the engine, don't force it—turn off the engine immediately and check the engine bay for loose vacuum hose connections. If all else fails, call a tow truck to take it to the repair shop—safety first!

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MarleyDella
10/18/25 5:45am

Last time I was driving the LaCrosse, I suddenly couldn't press the brake pedal and was completely stunned. At first I thought the pedal was stuck, but later a friend suggested checking the vacuum booster area. You see, when the engine isn't running, the booster needs to suck air for assistance; if there's a crack or air leak in the tube, it won't have enough power. I briefly removed the tubes around the air filter and actually found a small crack. After temporarily fixing it with tape, I immediately sent it for repair. During daily driving, pay attention to abnormal noises or the pedal feeling harder - prevention is much cheaper than repairs afterwards, and can also avoid accidents on the road.

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VanLuke
12/01/25 6:25am

This issue is extremely dangerous! If the brake pedal feels hard to press, it's most likely a problem with the vacuum booster. When the engine is running and this system fails, the pedal becomes as hard as an iron plate. Emergency braking at high speeds or in urban areas can easily lead to loss of control. I recommend pulling over immediately and turning off the engine. Check the vacuum hoses in the engine compartment for any looseness or damage; if it's not working, don't attempt to drive—call for roadside assistance right away. The key to safe driving lies in prevention. Regular maintenance of the brake system can reduce the risk of aging issues.

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