The Mazda 323 Ball Joint allows the suspension to pivot during steering with the tires firmly attached to irregular pavement. It works like a ball and socket, whereby a steel stud attached to the steering knuckle swivels in a greased housing attached to the control arm, and a rubber boot keeps out grit and, in so doing, retains grease. The Ball Joint allows the vertical movement of the arm and a horizontal sweep of the spindle simultaneously; therefore, it is able to combine bump absorption and directional change, which bushings alone cannot manage. There are two primary positions on this small Mazda, upper and lower, and they are either weight bearing loaded joints or lighter follower joints depending on the design type having a front wheel drive MacPherson strut or a short long arm design. The mass of the car is taken by loaded lower joints, which have wear indicators that, on popping out, indicate when the service threshold is exceeded, but unloaded ones are applied to just steer the alignment. Ball Joints are generally lifetime sealed and current Mazda designs prefer tight dust boots and better bearings, which extend service to around the eighty thousand mile mark. Once the boot bursts and contaminants get into it, drivers can hear clunks, experience steering pull, or observe uneven tires. The old Ball Joint would affect safety; hence, prompt replacement would restore sharp handling, and tire rubber would be maintained, which would ensure the enthusiastic feel that a young Mazda 323 should deliver.
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