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Ball Joints

sealed ball joints can fail as early as 80,000 miles

Signs of a failing ball joint start with a
 clicking, popping or snapping sound
 when the wheel is turned
and

 eventually turn into a squeaking sound at the end of a stop,
 when the gas pedal is used and/or also when hitting bumps.

Another symptom could be 'thud' noises 

 coming from front suspension when going over bumps. 

 Dry ball joints have dramatically increased friction 

and can cause the steering to stick or be more difficult.

If a ball joint fails, the results can be dangerous 

 as the wheel's angle becomes unconstrained, causing loss of control.