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It's popping the bulb off at the brake handle. I had the brakes on a different setup and it happened, swapped for Tektro and no further issues.
Friend is using these, happens sometimes, usually front brake first, under emergency stop stress. Two different bar/housing setups, plus mine is three.
Aesthetics over function, currently.
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It does sound as if it's the levers that are the problem (whether that's a design or manufacturing fault): are you routing the cable through the extensions, or underneath them?
A friend has a pair of levers going spare (OE of a 2014 Felt B12): I'll check, but I'd say £10 + postage.
If this is happening regularly to new cables, I'd look for another cause than weak cables: burrs, routing, clamping etc, depending upon which end is effected.