When compressing pistons on fixed calipers and if the rotor is deeply grooved or is the caliper cannot be forced off the rotor?

When compressing pistons on fixed calipers, if the rotor is deeply grooved or the caliper cannot be removed from the rotor, it can create challenges in servicing the brake system. The grooves can prevent the caliper from properly seating, and attempting to compress the pistons may lead to uneven wear or damage. In such cases, it may be necessary to inspect or replace the rotor and ensure the caliper is free to move before proceeding. Always use caution and proper tools to avoid damaging components during this process.