Having problems with your 2004 Mazda 3 ?
How push in the piston on the rear wheel brake in order to replace a new brake padd
After removing the caliper from it's mount, and If you are sure the piston is not frozen (rusted) in place, Try a very large C clamp. You should be able to compress the pistons with very little force. If not, you may need new or rebuilt calipers. Check online for more ideas by searching for Mazda rear brake repairs, you'll be surprised how much info may be out there.
Repair Help & Product Troubleshooting for 2004 Mazda 3
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