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14 Nissan Qiqi put on the brakes and stepped on it to the end. What's the problem?

The brake master cylinder cup is damaged and there is air in the brake oil tank.

1, the brake master cylinder cup is damaged, which will release the pressure when braking, thus causing one foot to step on the bottom when braking.

2. There is air in the brake tank. When the brake oil is just changed, the air in the brake pipeline is not completely exhausted, and the air in the pipeline will make the vehicle unable to brake, thus causing one foot to step on the end when braking.