Thanks Guys...

I agree with Waldo53, I will try the simple fix first as atomarc suggested. If that doesn't work I will start with KENc's suggestions.

Stuart
The cylinders aren't leaking. I was just concerned there maybe another problem when I felt the high and low drag.

When the wheel is on and I am adjusting from the back, which way is tightening, up or down ?

It might save me pulling a wheel back off to find out...

I read on another post about backing plate adjustment. Could this be part of the problem ?

Dave