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Hydraulic Brake Cut-Off Sensor with Magnet (generic)

When you convert a bike with hydraulic brakes, you usually do not want to swap out the levers. The fix is a stick-on cut-off sensor: a small hall sensor that glues to the lever body with a magnet on the lever blade, so the signal is sent as the blade moves. Sold in pairs, typically with a 2-pin Julet waterproof plug or bare wires. Installation is simple but placement matters — the magnet must sit within a few millimeters of the sensor at rest and move away when you pull. A little patience with the alignment makes the difference.

Mid-drive and hub conversions on bikes with hydraulic brakesRiders who want to keep their existing leversReplacing a failed sensor on a bike that uses this style

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Key considerations

Plug type must match your controller's brake input
Needs a flat spot on the lever body and a clean surface for the adhesive
Magnet gap must be adjusted carefully for reliable cut-off
A second layer of tape or a zip tie helps it survive weather

Pros

No lever swap needed
Works with any hydraulic lever
Cheap

Considerations

Adhesive can fail
Alignment is fiddly
Looks improvised

Compatibility notes

Controllers with a standard 2-wire brake cut-off input; confirm plug type (2-pin Julet is common)

Keep it running

Replacement parts

Confirm fitment on your bike before ordering — see each part’s compatibility notes.

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Cut-off brake levers are the standard way hub-motor kits stop the motor the instant you brake: a small switch in the lever sends a signal to the controller when you pull. Generic pairs come with either a 2-pin Julet waterproof plug or a small SM plug and work with mechanical disc and rim brakes (V-brake pull on most). They are a cheap safety upgrade for kits that shipped without cut-offs and a straightforward replacement when a lever switch fails. If your bike has hydraulic brakes, you want a sensor add-on or hydraulic levers instead.

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Best for: Converting a rigid or hardtail bike with a standard 68–73 mm threaded bottom bracket · Hilly commutes where a hub motor struggles · Riders who want gear-assisted climbing rather than raw throttle power

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