Does Car Need Alignment After Replacing Lower Control Arm?

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Just so, does control arm affect alignment?

control arm bushings don't affect alignment really, they just help locate the arm properly during suspension movement. If they are destroyed yes your alignment could be effected, but you would have noticed steering issues way before that.

Likewise, can lower control arms cause Tirewear? The lower control arm bushings can wear and crack, resulting excessive movement at the control arm pivot point, leading to irregular and premature tire wear. Worn Ball joints can also cause similar tire wear symptoms.

Also to know is, is it OK to replace only one control arm?

It is not necessary to replace both lower or both upper control arms if one is bad, but often they wear out at roughly the same mileage. If one control arm is bad and the other is on its way, it makes sense to replace both arms at once. This way, you only need to do the wheel alignment once.

What happens if control arm breaks while driving?

The control arm bushings absorb the shock of road bumps. When it's broken or incapable of functioning, the vehicle will continuously vibrate at the time of driving. It will also cause the metal sleeves of the control arm rattle uncontrollably, creating annoying clunking sound coming from the front wheels.