Brake is stuck
Checking method: temporarily remove the brake (Note: truck shall not be used without brake).
Measure the main line current of the power supply with a clamp ammeter, and compare the current before and after brake is removed. (Instruction video as below)
Tools: allen wrench; clamp ammeter
Required information for warranty claims:
1. Photo of truck name plate;
2. Video of showing main line current before and after brake is removed