Mechanics

THE STEERING HAS HARDENED EVEN AFTER REPLACING THE POWER STEERING UNIT

2003 Mercedes Benz E320 • 160 miles

Also identified is the problems with upper control arms could they be the reason why its become hard to turn the steering in motion and reverse?
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Teecee68
September 13, 2011.




There are a few possibilities.
When a pump fails it contaminates the system with meatl and rubber. It should be flush and filled in order to assure that there are no problems. Problems that occur can be; Pr-Mature wear of pump
Blocked passages created a harder steering feel
Problems with, "Speed Senstive Steering"
Damage to rack and pintion seals

The fron end suspension and overall alignment of the car can affect it as well.
If ball joints are not servicable, (cannot be greased and are sealed), they can tighten steering when they begin to fail. They are especially prone to the loxer ball joint.
Tension bar and other bushings can deteriorate and cause steering drag.
Upper mount for the struts can do the same thins.

So, there are a lot of variable. Take it to a dependable front end shop and have the suspension looked at as it is something that is overlooked as a safety issue.



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