Hi Raymond, it's Jack at Dyson.
DC40 doesn't actually have a separate reset button, as the brush bar reset mechanism is built into the on/off and brush control switches on the machine's upper body. If possible can you confirm exactly which machine you have, and which part you're trying to replace?
Alternatively if you'd prefer, you're welcome to contact our experts directly on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
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