When removing a caliper from a hydraulic system without disconnecting it, to prevent damage to the flex hose you should

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When removing a caliper, the hydraulic hose is still attached and can be subjected to weight and movement. Supporting the caliper takes the load off the hose so it isn’t stretched, strained, or bent awkwardly as the caliper is handled. This prevents damage to the hose or its fitting and reduces the risk of leaks or kinks when the caliper is reinstalled. The other options don’t protect the hose: tying the hose to the frame can restrict movement and cause rubbing or kinking; removing the reservoir cap doesn’t address hose protection; and spinning the wheel won’t relieve any hydraulic stress or protect the hose during removal.