Yes, the caliper is hanging up. It could be that all is needed is to clean the caliper. Check to see if the rotor is grooved, deep scratches, etc. check the disc pads, or the drums & shoes if that type of brake. It could be that you are due for all new brakes.
You could have some grease or oil on the pad or shoe and therefor causing it to hang up. The grease could be comning from a wheel bearing or seal. A lot of things could be causing your problem. I suggest you remove the wheel and do a inspection at your earliest connivence. If that wheel locks up and your on ice or rain, That will be one of those "OHhhh S**t moments."
Bill, enrolled member of Choctaw Tribe. 2005 Fleetwood/Revolution,AFE Filter,Aero Exhaust,Koni FSD shocks,KarKaddy SS. Progressive HW-50C.