When i bleed my back hs33 i do it in the bath,I do this by filling the bath about half way up with cold water then Put the hold break under water and undo both the bolts (the 5mm one on the calliper and the smaller bolt on the lever).After you have took these bolts out pump the break about 10 times getting all the out water or whatever you used befor out.Then put your finger over the small hole were you removed the bolt from the lever and pull the lever in,take your finger away from the hole and relise the lever slowly and steadly.Do this about 15-20 times and your break should be fine.Hope this helped and good luck