1. Inspect the brake caliper housing. Look for cracks, signs of excessive wear and/or damage. If any of these conditions are present, replace the caliper.
2. Check up a condition of anthers of pistons of a support. If there are cracks, tears, cuts, keratinization and/or incorrect installation in the caliper, replace or repair the caliper.
3. Inspect the caliper for signs of brake fluid leakage near the piston boots and pads. If there are brake fluid leaks, replace or repair the caliper.
4. Check the smoothness and stroke of the caliper pistons in the caliper bores.
The movement of the pistons should be smooth, without jamming. If the piston is stuck or moves with force, replace or repair the caliper.