Auto Health practitioner: bushing

Q: When I was undertaking a fix on my brake calipers of my 2011 Mitsubishi Lancer ES, I found that the pair of guidebook pins are distinctive. One particular aspect is just bare steel and the other has a rubber sleeve. I seemed remaining and appropriate for solutions as to what the rubber sleeve capabilities as. Also, I seen the guideline pin with the rubber sleeve is normally the a person that is difficult to take away from the bracket because of to its growth.

Why does a single have the rubber sleeve whilst the other does not? What is its function? What if I forgo placing in the rubber sleeve and just making use of the tutorial pins devoid of it?

When I pull out the tutorial pins I overlook which manual pin is matched to the bracket. Is there a rule of thumb in figuring out which guidebook pin matches into the bracket when reinstalling?