Joined: Feb 2012
Posts: 19,344
Likes: 5,461
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Glad the lack of washers between the fender bracket tab and the bolts didn't cause any issues.
Remove the hex socket bolt (likely a 5 or 6mm wrench).. Then remove the fender. Now you'll see another hex wrench fitting inside the smooth sided hollow "nut" that holds on the brake caliper. IIRC a 6mm hex wrench should fit it. Loosen and remove it. Now the caliper is able to be pulled from the frame.
These fender fitting nuts are called Sheldon Nuts. They allow fender mounting for bike that otherwise have recessed brake bolt mounts. Andy
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AndrewRStewart