How do I adjust my Motor Cut Off Sensors? (!)Updated 14 days ago
How to Adjust Brake Cut-Off Sensors
If your throttle and pedal assist (PAS) fail to engage, or if your motor stops working unexpectedly, the most common cause is a stuck or misadjusted brake cut-off sensor.
Required Tools:
- 2mm hex wrench
- 7mm open-end wrench
Important: Always turn off and power cycle your e-bike before performing any mechanical or electrical maintenance.
How to Identify Engaged Cut-Off Sensors
- X-Class 52V & Grizzly: A circle icon with an exclamation mark (!) inside will appear on the display screen when a brake sensor is active.
- Kepler: No icon will appear on the display, but neither the throttle nor PAS will engage the motor.
- All Models: The brake light will illuminate when a sensor is engaged. If your brake light stays lit without squeezing the levers, a cut-off sensor is stuck.
Step-by-Step Adjustment Instructions
- Power down: Turn off the display, remove the battery, and power cycle the system to discharge remaining electrical current.
- Locate the brake sensor:Locate the sensor housing on the brake assembly, near where the thin sensor cable enters the brake lever body.
- Identify the adjustment screw:Locate the small adjustment screw on the brake sensor housing, secured by a locknut.
- Adjust sensor sensitivity:
- To reduce sensitivity (if motor cuts off constantly): Turn the adjustment screw counterclockwise. This moves the sensor further out, preventing false cut-offs when levers are released.
- To increase sensitivity (if motor fails to cut off when braking): Turn the screw clockwise to bring the sensor closer.
- Test the adjustment: Reinstall the battery, power on the bike, and test both brake levers. Verify that the motor cuts off when squeezing either lever, and that the motor engages normally when the levers are released.
Watch this video for a visual step-by-step demonstration:
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