My AUDI A4 2001, got water in the brake booster and started to freeze the brakes

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My AUDI A4 2001, got water in the brake booster and started to freeze the brakes and recently the brake is holding the wheels and rims and get hot and crashes itself once in a while in progress and ABS and ESP lights on panel I took water outo f the brake booster but problems remain. what do I do? what is the problem? I ask for help ...