This is the answer I got on one of the threads: I needed to replace after getting water contaminate in mine (occured after a service but dealer adamant nothing to do with them) and I did not want to do any bleeding etc. So I got 2 ltrs of the pukka Tutela CS Speed then took off the reservoir the insulation, and removed from bracket. There are two hoses one the feed the other the return, get the engine running and you can see which is which. I took off the return hose (minimal fluid loss as only pressure from res) and pointed into a plastic bottle and plugged the hose hole in the res. Get someone (engine running & footbrake on) to go from N to 1 to N to R to N, as the actuators run it uses the fluid then ejects back to the return and into the bottle. Keep the res topped up as in bleeding brakes and you should see a difference in the colour of the fluid returning into the bottle to know when complete.