2009 - cv boots and axles

#2
They will be obviously damaged or tore. Their function is to keep contamination out of the cv joints and keep the grease in.
 
#3
Check for cracks. If there is some cracks on the rubber part you need to replace it as soon as possible. Once it is torn or damage the water or dust will go inside and damage the metal also. So better to replace the rubber once it started to crack.
 
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