[Tercel GTS]

you might check the pins/bolts that attach the caliper to it's bracket, if these are dirty/rusty it'll hold the caliper still wearing only the inner pad instead of allowing it to float and use both equally.

 

[Tercel GTS]

just keep workin it till it's nice on all the pins, and you might have to replace one or 2. At least you're on to your problem now.