The following is by my understanding.<\/p>\n
I mention in my post from Sept 26<\/a> using penetrating fluid to loosen caliper bolts. On the vehicle I’ve been working on lately, a 2013 Jeep Patriot, the caliper bolts and caliper pins are the same thing.<\/p>\n \nA peculiarity of this vehicle is that the two pins of a caliper are different. Specifically, one has a rubber bushing while the other doesn’t. Which is which, and why?<\/p>\n \nIt turns out that if one caliper pin has a rubber bushing, it’s usually what they call the trailing one, meaning the second one a point on the rotor would pass during a revolution of the wheel. The rubber bushing is meant to prevent vibration, noise, etc. It seems to work pretty well, in that regard.<\/p>\n \nYet, the rubber bushing can make the trailing caliper pin very hard to extract. I’ve been in a situation where the caliper pin was unscrewed past the threads, would turn freely, but just didn’t want to come out. Putting a wrench around the underside of the bolt head can facilitate more effective pulling, but even then it can be surprisingly hard to remove.<\/p>\n \nSource:<\/p>\n