The emergency brakes have an adjustment for slack in the cable, BUT typically the brake shoes for the emergency brakes are very thin and a poor design if you have disk brakes. For the disk design, the Emergency brakes can peel off of the metal shoe and get grinded up inside the hub. The drum surface will pit and rust and unless used constantly, will not provide a clean surface to work against.
For drum brakes, you still have an adjustment connection but each side has adjusters for the service brakes which is meant to put even pressure on each wheel. When the service brakes are properly adjusted, the Emergency brakes will work better as part of the service brakes are used for emergency braking.
If the rear brakes are functioning and adjusted correctly (as inspected by a mechanic), 1 or more of the 3 park brake cables are broke.
Have your rear brakes inspected for excessive wear and to make sure the E-Brake Cable is not broken.
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