I've never broken a presta valve. I'm working on bikes every day in my shop. At Branch out this year, I probably filled 60 tires with presta valves. It's likely the pump you are using. My floor pump is an air tool pro, and for biking, I usually use co2, but for a backup pump, I carry a lezyne with a hose. This way I don't reef on the valve when pumping it up.
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