How to Solve Insensitive Car Brakes?

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Check whether the brake fluid level is normal and whether air has entered the brake system due to leakage. If so, add brake fluid to the specified level and bleed the system. Check whether the brake master cylinder and the four-wheel slave cylinders are functioning properly and whether there is any leakage. If there is leakage, replace the master cylinder or slave cylinders. Check whether the brake pads have exceeded the wear limit. If so, replace them with new ones.