Ball joint
From Wikipedia, the free encyclopedia
- This article is about the automotive part, for general ball joints, see Ball and socket joints.
In an automobile, ball joints are spherical bearings that connects the control arms to the steering knuckles.
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[edit] Purpose
Ball joints are the pivot between the wheels and the suspension of your vechicle. Your ball joints play a critical role in the safe operation of your steering and suspension.
[edit] What is it?
A ball joint is a steel bearing stud and socket enclosed in a steel casing. The bearing stud is tapered and threaded. It fits into a tapered hole in the steering knuckle. A protective encasing prevents dirt from getting into the joint assembly.
[edit] Maintenance
Sealed ball joints do not require lubrication as they are "lubed for life" but standard ball joints must be lubed from time to time. It's best to inspect standard ball joints once a year. Generally speaking, standard ball joints will outlive sealed ones because eventually the seal will break, causing the joint to dry out and rust. While there is no exact lifespan that can be put on a sealed ball joint, they can fail as early as 125,000 miles. Signs of a failing ball joint start with a clicking or snapping sound when the wheel is turned and eventually turns into a squeaking sound at the end of a stop, when the gas pedal is used and/or also when hitting bumps. Please note that if a ball joint fails, the results can be dangerous as the wheel will attempt to fall off the vehicle, causing one to lose control. Because the tire will be at an odd angle the vehicle will come to a screeching halt, damaging the tire. Also, during failure debris can fly out at orbital speeds, damaging other parts of the vehicle. When there is evidence of a failing ball joint it is best to avoid pot holes, especially at high speeds, as these will cause stress on the ball joint.
[edit] See also
[edit] External links
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