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Why Does the Brake Become Hard After Turning on the Car Air Conditioner?

1 Answers

VanJuniper

07/29/25 10:01pm

When the air conditioner is turned on, the engine load increases, leading to a decrease in throttle vacuum, which results in reduced brake vacuum assistance. However, the impact should not be significant enough to make the brake pedal difficult to press. There might be an issue with the brake vacuum system. Turning on the air conditioner consumes a large amount of vacuum, rendering the brake vacuum assistance ineffective. It is advisable to send the vehicle to a 4S shop for repair as soon as possible. Below are some tips for air conditioner maintenance: 1. Comprehensive air conditioner inspection: When using the air conditioner for the first time in summer, it is essential to inspect the air conditioning system. Check the refrigerant and whether the air filter is too dirty through the reservoir, and ensure there are no foreign objects in the radiator. 2. Pay attention to air conditioner cleaning: The air filter should be replaced regularly to prevent moldy odors. Additionally, the condenser should be cleaned periodically, and the radiator should be removed for thorough cleaning.

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