Brake Disc Caliper problems of the 2008 Dodge Nitro

I bought my Nitro brand new in 2009. Everything seemed to be working except the radio. In 2017 I started having brake issues . I had my breaks replaced and calipers 4 times because the back breaks would not release all the way causing my break pads to wear fast. I had to let it sit for some time because I was afraid to transport my children in it for fear that they would lock up completely. I took it 1 dealership where I bought my Nitro from and them 3 other mechanics to see if they could figure out the problem. It is not 2020 and I just had it in the shop because the water pump went and found out my emergency break snapped I needed new breaks again. I hate to get rid of my Nitro but it has been nickle and diming me not knowing what is wrong with these breaks.