With the parking brake released go under the car and trace the parking brake cable s all the way the the rear brakes. If no problem is found jack the rear of the car up and remove the rear wheels. Remove the brake drums (you might have to insert a brake tool or screwdriver and loosten the adjustment in order to get the drums off. Inspect both brake systems for problems. If you drove through water on your last trip and the car was parked for several days the rear shoes sometimes get stuck to the drums because of rust. Water on the shoes can also cause the automatic adjustors to over tighten the shoes and adjusting the tension with the brake tool or screwdriver will correct it. Most of the time the adjustment slot is on the backplate at the bottom and has a small rectangular rubber plug you have to remove to make the adjustment. Some of the newer vehicles have the adjustment on the front of the drum and is a round hole which must be near the top to reach the adjustor.
Parking brake cables sometimes bind up - you may need to inspect and replace. If you're really unlucky, maybe one of the cable has actually managed to snap at a connection. Also there's usually a spring on the far end of the cable which assists in disengaging the brake - check these haven't failed.
Hope this helps,
Sherwin
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