Your car's brake calipers are one of the most essential components in your vehicle's disc braking system. As such, you'd want to make sure that it's always working, and that it stays in place underneath your car. Your brake calipers are usually held in place by a pair of brake caliper bolts, an upper and lower bolt on each caliper. In time, these bolts could wear out, and that could affect your vehicle's braking power, so you'd want to take them out and replace them ASAP. It's quite easy to buy the right sized bolts for your brake calipers, all the information that you'll need would be in your car's manual or just a phone call away. The only hard part that you'll have to deal with is taking out your old bolts, which can be a chore to deal with.
Get the right size
The only thing that you'll need to worry about brake caliper bolts is that you get the right size that'll fit into the sockets of your brake calipers. Check your vehicle's manual or give your dealer a call to know what sized bolts you'll need. You wouldn't want a loose bolt that won't properly mount your calipers in place, nor would you want a useless oversized one that won't even fit.
You'd also want to get the right number of bolts for your car. It can be quite frustrating to be underneath your car and realize that you're missing one more bolt, after you've spent the whole afternoon removing your old stubborn ones.
Stick with OEM
Never use just any other bolt that you find in your local hardware store to replace your brake caliper bolts. They are not made to handle the extreme heat and stress associated with car brakes, and could snap at any moment. Stick with OEM made brake caliper bolts as they are designed to fit perfectly into compatible brake calipers. Most brake caliper bolts would cost around $15 - $40, depending on the bolt's size. Nevertheless, it is money well spent since they'll guarantee to keep your brake calipers in place, and have your brakes working when you need them.