Phylicia M

I wonder if anyone can help me solve and issue with my Thomas Stuart Prodigy wheel. When I disengage the foot pedal, the wheel keeps spinning very very slowly. I have to turn the wheel off to make it still. It there a way to fix this? I have taken the wheel off, the tub off, checked for debris in the pedal that maybe blocks it from turning off…but it all looks good. this wheel is one I bought from a second party so no warranty. It does work very well though…just wont stop that slow creep.