My rear right caliper may have been stuck ? Anyways it wore down the pads on that side
down to nothing , the pressed back inot the caliper fine .
Any one know what may cause this ?
I am guessing it may have something to do with the tension spring ? I never repalced it .

 

your piston could be shot, maybe time for a new caliper?

 

A number of things may have occured, contaminents in the fluid, dust and grime build-up around the piston... You may get by with replacing the faulty one but it is recco'd to do them in pairs for balance.