Ensure your parking brake is set.
Locate the front brake calipers. They are located on the front wheels, behind the wheels.
Remove the bolt(s) that holds the caliper to the caliper bracket. There will be two bolts, one on top of the caliper and one on the bottom.
After the bolts have been removed, carefully remove the caliper from the rotor. Be careful not to damage the rotor or the brake pads.
Repeat steps 3 and 4 for the other front brake caliper.
Once both calipers have been removed, you can replace them with new ones or repair them as necessary.
