Case 621D Parking Brake Rebuild Question

I am test driving a low hour Case 621D wheel loader. I have to replace the seals in the parking brake assembly. It looks similar to a caliper from a truck. Is there anything I should be watching out for when removing it? This loader sat for a long time unused or hardly used, it only has 2800 hours showing & it feels like a new machine when driving / using it. I do not have a repair manual, however the CASE dealer sent over a PDF of the parts.