I jacked it up drained the reservoir, removed the pump unit, cleaned , replaced seal, refit in reverse order, then topped up reservoir and started....... then it growled at me and growled at me and guess what it growled a bit more, all the time I was turning the steering lock to lock. in the end I turned it off come in side had another quick read and posted on here again.buy the time I had gone back down and started the car again the air had bleeded and all was quiet... yippeeee. had a road test and all was greet. cheers.. A QUICK MENTION AS WELL fitted the EGR cheater today which has worked fine, so a big thank you to Vocky... cheers..