2001 Other Plymouth Models Rear passenger brake locking up t

My rear passenger brake and/or tire is locking up. When it locks up it locks up for either 3-5 seconds or it will not release and I have to stop put the car in park and pull up on the emergency brake to release the tire. It mostly happens after making a turn or going over railroad tracks. At first it happened maybe 2-3 times a week, now it's happening 4-5 times in a 10 minute trip. It only locks up when i'm driving 10-30 miles. I would appreciate it if someone could get back to me about this soon. Thank you.