Calipers can be rebuilt but if the pistons are scored caliper will require replacement
Caliper pistons should retract if calipers are in working order. Calipers need to be removed and rebuilt or replaced. A brake fluid flush is highly recommended.
The rear disc break pistons on Mazda are not to be pushed in. Instead you turn them in clockwise.
Brake pistons are actuated by either fluid or air pressure. As you depress the brake pedal, the increase in pressure in the brake line expands the flexible end of the brake line, located in the brake caliper. As the pressure increases, it forces the brake piston to move within the caliper, putting pressure on the brake disk, and slowing its rotation, slowing the vehicle. As the brake pedal is released, it creates a vacuum in the system that causes the piston to relax and free the disk to spin again,
You can adjust the brake pistons by adjusting the brake piston adjustment screw. Turn the screw to the right in order to back off the brake piston.
Brake pots are the pistons inside the brake callipers fitted to the vehicle. Slang for brake cylinders.
The brake pistons may not be retracting properly due to issues such as worn out seals, dirt or debris blocking the piston movement, or air in the brake lines causing a lack of pressure. These issues can prevent the pistons from retracting fully, leading to brake drag and reduced braking performance.
Hydraulic Fluid
Clockwise
Rebuilt. Usually the pistons are replaced etc to work like new.
The Brake Piston Cube is a cube-shaped tool used to retract brake caliper pistons in vehicles when changing brake pads. Its design allows it to fit into the caliper housing and apply even pressure to retract the pistons back into the caliper, facilitating easier brake pad replacement. By turning the Brake Piston Cube, the pistons are compressed uniformly without damaging the caliper or seals.
Pressure is released from the hydraulic system and brake pistons relax.
Your SRAM brake pistons may not be retracting properly due to air bubbles in the brake system, contaminated brake fluid, worn brake pads, or a misaligned caliper. It is recommended to bleed the brakes, replace the brake fluid, inspect the brake pads, and adjust the caliper alignment to resolve the issue.