Thanks for the replies, The 18 mm size was the right one, from nutter3 I also did not have that size in the tool box but now I do. You do need a big bar as they are tight. What worked good for me was to take the clamp on the brake hose that holds it to the frame off , this gives you an extra foot of hose, then get a box about a foot high and put a short length of wood on it and you have a little bench to set it on, no more trying to work with ties or wire to hold it up, I also had to remove the two 13 mm bolts that hold the thing together to get the pads out, something new I guess, First one took 2 hours second one in 25 min. that's taking the wheel on and off and doing the work, so there is a learning curve What ever have a good day and Thank You all Dan