Solution: The solution is to replace the faulty rear brake adjusters. This is a relatively simple repair that can be performed by a home mechanic. The rear brake adjusters are located behind the brake drums, and you can access them by removing the rear wheels.
Here is an overview of the steps to replace the rear brake adjusters:
1. Remove the rear wheels.
2. Remove the brake drums.
3. Inspect the brake adjusters for wear or damage.
4. Replace the faulty brake adjusters with new ones.
5. Reassemble the brakes and reinstall the rear wheels.
Note: It is important to use new brake adjusters when replacing the old ones. Using old brake adjusters can lead to premature failure of the new brakes.