Wheel cylinder removal

Soak the connection with a good penetrating oil, (I like PB Blaster) and use a small wire brush or something similar to clean up the connection where the wrench goes on. Before you unclip the hose from the bracket, unscrew the fitting on the hard line. Use line wrenches to avoid rounding off the fitting. If the guy before you has "pre-rounded" the hex fitting, you'll have to use vice grips.