Could be the adjusters are rusted stuck. Could also be installed incorrectly. I have seen people unkowningly swap the left with the right side in which case they wouldn't work. You can purchase adjuster kits and hardware kits and replace all the parts.
The front brakes are disc brakes and are self adjusting. The rears are drum brakes and are also self adjusting providing the self adjusting mechanism is in working order.
If they are drum brakes then yes they are self adjusting, But they never adjust themselves right. You will need to adjust them. If they are discs brakes then there is no adjustment. ( replace pads)
They are disc brakes and self adjusting
what are
the self adjuster could be frozen or rusted up.
Yes, all modern rear brakes are designed to be self-adjusting. See "Related Questions" below for more
sum yes
well the rear brakes assuming that they are drums, are self adjusting, if they are not adjusting properly change the springs and the self adjusting cams could be seized up, kia calls them rear brake strut assembly
You have disc brakes front and rear. Disc brakes are self adjusting. If the brakes are poor, you have a problem and it needs attention.
Disc brakes do not require adjustment like drum brakes. They are self adjusting by design.
The problem with the rear brakes locking up may be the self adjusting screws themselves. They should only tighten when reversing the car and hitting the brakes, putting the pressure on the drums in back instead of the rotors in front.
your e brake cable needs adjusting.