A production error in a batch of the Roxim Z4E Pro (ST3 Pinion) or Z4E Elite (ST1 / 2021) resulted in the lighting used lighting up or flickering to varying degrees when braking or pedaling.
Quote of the Stromer driver 'Der Osnabrücker'
"When I'm coasting, it's bright, when I'm pedaling, the light intensity is much dimmer. The same applies when I apply the brakes while rolling. The headlight always remains bright on high beam".
The lamps will be replaced by Stromer as part of the warranty.
Workaround
The problem can usually be solved by attaching an insulating washer or tape to the designated area on the PCB. If it does not work, the lamp must be replaced.
EN 
DE 
NL_NL 
NL 
FR