Check up the hydraulic power steering pump.
See picture below for 1.6, 1.8 liters Audi (4 cyl.) engines:
If you find leaks and noise when runing, the hydraulic vane type pump is damaged. The pump **** air inside and mix air with oil resulting foam. Therefore fluid volume inside steering instalation rises. Then pressure overflows oil from the reservoir. You need repair or replace hydraulic vane type steering pump.
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