No braking force assistance after engine start diagnostic trouble code (DTC) 4808B4.
BMW technical service bulletin B340619 for 2019 BMW X5, 2016-2017 BMW 750LI and 2019 BMW X7 and others.
- Bulletin number
- B340619
- Component
- Service brakes, electric
- Summary
- NO BRAKING FORCE ASSISTANCE AFTER ENGINE START DIAGNOSTIC TROUBLE CODE (DTC) 4808B4. When starting the vehicle with Electric Park Brake (EPB) engaged. The brake pedal is hard. The red brake warning light in the instrument cluster lights up. The braking force assistance has failed (stiff brake pedal). Check Control message appears: Drive at a moderate speed. Braking force assistance. After starting the engine again the warning light is no longer active and the braking force assistance is available again.
Owners of these vehicles have filed 16 complaints in the brakes category.
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