My problem with braking is help!

Hello.When I change the rear torsion balls of my vehicle in my signature after changing, I shake the car from the back, shaking the car. I used it, but after 1 week has passed, there is no improvement in the situation. Are you facing such a situation? What are your solution suggestions?

Does anyone have an idea?

If the problem started after the last operation, they could not make the torsion properly. Apply again to the place you have repaired