The pins are rusted up. Spray some PB blaster where the pins slide; tap on the caliper with a small hammer lightly to cause vibration so that the PB blaster will do it's job. You'll have to try to hammer them out otherwise it's time for new calipers.
caliper glide pin
I tried to replace the front brake pads on my 1994 altima but couldn't because the caliper glide pin wouldn't come out. it will spin and move in and out about 1 or 2 mm but wont go all the way in or out. what would cause this and what are my options?
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Most of the time it's rust, but sometimes the rubber sleeve on the one pin will adhere to the bore or the grease gets caked-up. If it is badly rusted and being 94 model year, it may make sense to get a remanufactured brake caliper assembly w/ bracket and replace it (I would also get a new hose if replacing the caliper). You can probably find a pretty good deal for those parts at Rockauto.com. If it is the rubber sleeve at the end of the one pin, you can get a caliper pin boot kit which has new bellows and slide pin sleeves and only costs a few dollars. You can get the proper slide pin grease at any auto parts store in small packages (about the size of a ketchup package) or in a plastic jar with a brush attached to the bottom side of the cap.
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