How thick are brake pads?
How thick are brake pads? This varies depending on the application, but the friction layer on most brake pads is between 10 and 12 mm thick. Front brake pads, which do most of the braking, are thicker than rear pads. As you use your brakes, the pad material wears down. For most applications, replacement is recommended when the pads are 3 mm thick.
If youre having trouble fitting new pads on your brakes, the caliper pistons may not be pushed in enough. As long as you have the right pads for your vehicle, they should fit between the brake caliper and rotor.