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Service bulletin B340619

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10161562
Published by NHTSA2019-06-24
Manufacturer's numberB340619
Manufacturer's date2019-05-01
NHTSA componentSERVICE BRAKES, ELECTRIC

NHTSA's 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 After starting the engine again the warning light is no longer active and the braking force assistance is available again.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes

Vehicles listed
BMW 740E2017
BMW 740I2017
BMW 740LI2016 to 2017
BMW 750LI2016 to 2017
BMW M760I2017
BMW M850I2019
BMW X52019
BMW X72019

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
21V0620002021-02-10. SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC; SERVICE BRAKES, HYDRAULIC

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
B3407142023-11-01. Service bulletin. Functional noises (squealing/honking) when braking shortly before the vehicle comes to a stop. CAUSE Material-
SIB5106232023-05-15. Service bulletin. The hazard light (aka emergency flasher) button gets stuck in the ON or OFF position when actuated.
SIB1702202022-10-17. Service bulletin. Symptom 1: There are traces of coolant leaking under the vehicle, or there is significant pressure released along with coolant loss when opening the low temperature cooling system reservoir (engine cold). The following fault code may also be stored in the DME: 20A201 - Charge air cooling system: Coolant pump protective function activated due to dry running Symptom 2*: The air conditioning may have low cooling output with the following fault stored in the IHKA: 80120A - Compressor: Shut down due to overpressure in refrigerant system. Symptom 2 is an additional symptom related to Symptom 1. Diagnose the IHKA fault with ISTA test plans if it is the only fault stored (if no DME faults are stored related to coolant loss, this bulletin repair does not apply).
SIB3407212021-12-13. Service bulletin. When starting the vehicle vehicle at standstill, various yellow Check Control Messages CCMs appear. ID code 00042: Brake system. Additional notes: Avoid abrupt braking as far as possible. Drive at a moderate speed. Have it checked by your nearest Service Center. ID code 2046: Braking force assistance. Additional notes: Braking force assistance failure. Higher pedal force required for vehicle deceleration. Drive at a moderate speed. Have it checked by your nearest Service Center.
B3601212021-05-24. Service bulletin. Diagnosis of Compound Brake System Complaints in M Vehicles: 1. Visible cracks are caused by high thermal stresses during rapid heating and cooling of the brake discs. Braking from high speed with cold brake components (less than 212 degrees F) increases the likelihood of cracks to form.
B3405172020-08-31. Service bulletin. TICKING NOISE WHILE CORNERING WITHOUT THE BRAKES APPLIED: Ticking noise coming from front wheel while cornering without brakes applied, noticeable at low speeds. The vehicle must be moving.
B1703202020-06-15. Service bulletin. COOLANT LINE QUICK DISCONNECTS LEAK IN LOW TEMPERATURES AT OR BELOW -15Ë?C (5Ë?F): The coolant reservoir in the high or low temperature cooling system is low There may be a coolant leak under the vehicle There may be a check control message (ID166) to top up coolant The low temperature cooling system have a low level warning indicator. One or more faults may be stored related to the low temp cooling system: DME - 20A201 - charge air cooling system: Coolant pump protective function due to dry running active DME - 20A209 - charge air cooling system: Coolant pump protective function due to dry running active IHKA - 80120A - Compressor: Switch off due to excess pressure in the refrigerant circuit The outside temperature at the time of the complaint is at or below -15Ë? C (5Ë? F) The O-rings that seal the quick disconnect coolant lines will not seal properly when outside temperatures are at or below -15Ë? C (5Ë? F).
B5130162020-04-20. Service bulletin. TAILGATE UNINTENTIONALLY OPENS: This Service Information Bulletin (Revision 4) replaces SI B51 30 16 dated March 2018. Trunk/tailgate may open when vehicle is locked Trunk/tailgate may open while the vehicle is in motion usually after stopping such as a traffic light etc. Vehicle key trunk/tailgate button may be accidentally pressed thus opening the tailgate.
B3405172020-04-20. Service bulletin. TICKING NOISE WHILE CORNERING WITHOUT THE BRAKES APPLIED: This Service Information Bulletin (Revision 3) replaces SI B34 05 17 dated September 2017. Ticking noise coming from front wheel while cornering without brakes applied noticeable at low speeds. The vehicle must be moving. See attached video V34 01 20 Note: For a similar noise heard when parking with the brakes applied refer to SIB 31 01 12. Microscopic movement of the contact interface between the inner brake disc and the wheel bearing flange on vehicles equipped with lightweight brake discs.
B6210192020-01-21. Service bulletin. INCORRECT CONDITION BASED SERVICE DATA FOR BRAKE FLUID SERVICE. "Brake fluid service due since 12/2001" is displayed in the instrument cluster although the vehicle is only a maximum of 1 year old. Software error in the KOMBI (Instrument Cluster).