Avid are OK either hand as they're a closed system but most other brakes are meant to only be run on one side to stop air getting into the system, a lot of brakes tell you not to store your bike upsidedown for the same reason.
@snottyotter started
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Avid are OK either hand as they're a closed system but most other brakes are meant to only be run on one side to stop air getting into the system, a lot of brakes tell you not to store your bike upsidedown for the same reason.