You may have burned up the pads or gunked up the mechanism inside the rotor if you drove too long with it partially engaged. It may be a good idea to pull off the brake rotor and take a look. Just remove the wheel and there is a hex bolt that holds on the brake rotor. Be careful since the head strips easily. Hit it with some PB blaster before you go at it. If it strips you need to drill out the head. I replaced mine with stainless steel so that they wont strip again. That single screw is all that holds the rotor on since the wheel lug bolts do the actual holding. The rotor will then slide right off and you can check out the parking brake pads. You can probably clean out some of the gunk. If you use any chemicals make sure not to get lube on the pads. I would just blast it out with brake parts cleaner. Don't breathe in the dust!
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