Is it my Sterring wheel Pump

jaceyq

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Hi I have got an A4 b8 58 Reg only done 68k miles I have notice while driving when the car is cold turning is fine no knock but when the engine becomes warm and turning at lower speed like parking or manouvering I get a slight knock when turning to the right only on the steering wheel .
Park the car up for a while . Let it get cold and get back driving no knock nothing fine but only when temperature is warmer then I get the knock on the sterring wheel .
I bought some power sterring fluid and added . But problem still persists . What can it be .
Help help