It was your excellent post that I followed, I have flushed the rack out a few times but the filter still gets blocked.
I was going to fit a pas reservoir with out the filter but have decided not to in case i damage something else.

so a new rack it is, thanks for your input I appreciate it. 2014 Audi A4 Avant - Dont like it !
08 FL2 HSE AUTO, LOVE IT.
1999 ASTRA VAN,HAD IT FROM NEW.
KAWASAKI KH 250 B4.