Power steering noise

[Redcar01]

Hi All My Audi Avant 2.0 tdi 2012 makes a hissing noise when turning the steering wheel when manoeuvring usually on full lock. a hiss every second or so do I have anything to worry about never heard of this before. Thanks

[Guest 2]

Any worries just take it straight back.

My A3 does this, but I haven't seen/heard any other problems relating to it.