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Usually when your master cylinder starts to bypass internally, so does the caliper seals.
I always rebuild the whole system
And yes, it is very possible to have a small leak or hairline crack at the line fittings, check those too.
We always check the braking system, before we check our power plant, brakes should be the first thing to check before a track day, as a safety rule.
Always flush and bleed hydraulic brakes.