How to troubleshoot brake sensor errors Follow
Symptoms
- Both Throttle and PAS do not work
- Error 37 on Stunner LT
- Error 03 Bafang motors, Stunner, Stunner X, Juggernaut Classic, Juggernaut Classic HD, Juggernaut Ultra, Juggernaut Ultra FS
- This symbol is staying on screen after brakes are released
How to check
- Follow wires coming from brake sensor and unplug both left and right and see if symptoms disappear
- If so, plug in one and check if the error/symptoms return
- repeat on the other side to confirm which brake is the cause
Solutions
Mechanical Brakes
- Make sure levers are returning to original position freely
If Good
- Tektro
- Adjust Brake sensor alignment screw
- Loosen set screw
- Loosen adjustment screw 1/2 turn
- Check if this fixes symptoms but brake sensor still activates and repeat with smaller adjustments
- Looser trips cutoff with more brake pressure
- Tightening trips cutoff with less brake pressure
- Loosen set screw
- Adjust Brake sensor alignment screw
- Other
- Remove lower cover
- Check for physical blockage and smooth movement of switch
- If neither fixes contact support for replacement
Hydraulic
- Tektro
- Adjust Brake sensor alignment screw
- Loosen set screw
- Loosen adjustment screw 1/2 turn
- Check if this fixes symptoms but brake sensor still activates and repeat with smaller adjustments
- Looser trips cutoff with more brake pressure
- Tightening trips cutoff with less brake pressure
- Loosen set screw
- Adjust Brake sensor alignment screw
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