From Ross-Tech Wiki
721152 - Brake pad replacement mode active
- EPB light on
- Parking Brakes in service mode for rear brake job
- Basic Settings "Start lining change mode"
- Complete rear brake job, then test parking brake operation
- On UDS EPB modules, this code is normal while doing rear brake service. In most cases, you can not clear this code out with a scan tool, it should clear out on its own after you set and release the parking brakes.