If it's a road caliper style thing and you're pretty sure it's all back together in the right order you've probably over tightened one of the pivots.
Its the road caliper style, it was the spring that came out. Now it closes but doesnt open, not even cabled just moving it by hand.
@snottyotter started
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If it's a road caliper style thing and you're pretty sure it's all back together in the right order you've probably over tightened one of the pivots.