Garage Files: How to Check and Replace Your Brake Pads
11-If you’re replacing your pads because they’re contaminated and not because they’re worn, sometimes you can file them down to remove the contaminated portion and breathe some new life into them. However, it’s usually best practice to simply replace contaminated pads.
12-Hydraulic brake pads are designed to automatically compensate for pad wear by creeping in gradually as the pad wears down. Many riders will tell you to use a flathead screwdriver directly on the pads to push them apart, but this will likely gouge the pad material. Instead, use a more blunt object like the end of a wrench to gently push the pistons apart and back to their fully retracted position.