Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
It's a common problem, dirt and gunk restricting the pistons from withdrawing all the way. These brakes have no protective boot to keep the piston and bore clean.