How can ball joints be inspected?

Inspecting ball joints is crucial for vehicle safety and performance, as they are pivotal in connecting the wheel hub to the suspension system. The correct method involves jacking the tire under the A-frame. This allows for an accurate assessment of the ball joint's condition by loading it properly, which can reveal wear or play that may not be evident when the vehicle is at rest.

When the tire is jacked under the A-frame, it simulates the weight of the vehicle, enabling mechanics to check for excessive movement or looseness in the ball joint. This method identifies potential issues such as worn bearings or deterioration that could affect handling and steering if left unaddressed.

Other methods like visually inspecting for rust do not provide a complete picture of the ball joint's functionality, as wear can occur without visible rust. Changing the tire first does not facilitate inspection of the ball joint itself, and removing the ball joint entirely is an invasive procedure that typically isn’t necessary just for an inspection. These methods do not effectively assess the joint’s condition under real-world load conditions.