Independent front suspensionThis type of suspension allows for the wheels to maintain their alignment settings, while turning left and right and moving up and down. The front suspension also absorbs the twisting motion from hard braking using several different methods depending on the specific vehicle design.
Control arm front suspension
On this type of setup each wheel is independently connected to the frame using a steering knuckle (spindle), the control arms themselves, one upper and one lower ball joint on each side.A wheel spindle and a steering knuckle are one and the same part that performs two operations. The wheel attaches to the spindle through wheel bearings. The steering knuckle is connected to the control arm at the upper and lower ball joints. The ball joints allow the steering knuckle or spindle to move left and right while maintaining alignment settings and rigidity.
In this case, lubricant is installed from the factory and then sealed. My 2004 Chevy Blazer has grease fittings in both upper and lower ball joints. It is important to recognize what type is on your vehicle so that proper maintenance can be performed. Ignoring grease fittings can cause premature wear and failure. This can also be considered a safety concern and is why it is recommended to check your front end for looseness during regular maintenance services.
Checking independent front suspensions
The ball joint gets its name from its construction. It is usually a two-piece assembly and includes a one-piece heavy steel stud and ball fitted into a socket. This allows for free steering movement as well as independent front suspension rebound. When the ball or socket is worn the connections can become sloppy and movement can be detected. Your online car repair manuals will provide specifications for the amount of movement that is allowed before replacement is recommended.
When in doubt, take the side of caution and replace the loose independent suspension parts. The control arms both upper and lower attached to the automobile frame. Many different configurations exist, but most have what are called control arm bushings. These are metal and rubber components that allow the control arms to move up and down depending on road conditions. They do not allow the control arm to move in any other direction, but up and down.
These control arm bushings can deteriorate and cause tire wear as well as other drivability concerns. A visual inspection of the control arm bushings is recommended before performing a wheel alignment. When you decide to replace the control arm bushings you can usually get standard or polyurethane, high-performance bushings. There is no question that a polyurethane bushing will last longer. So your choice on the replacement parts really depends on your plans for the vehicle. If you are into high performance driving the harder polyurethane bushings will give you a stiffer suspension for hard cornering. But may provide less comfort for regular driving.
 Custom Search Find out what other kinds of auto repair items are covered on this website. Also learn more about the Mechanic that thinks some people can do there own car repairs
|
