# Service bulletin B360121

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.

- Type: Service bulletin
- NHTSA id: 10194298
- Published by NHTSA: 2021\-05\-24
- Manufacturer's number: B360121
- Manufacturer's date: 2021\-04\-01
- NHTSA component: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; SERVICE BRAKES, AIR:DISC

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194298-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194298-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Equipment and accessories

## Vehicles listed

- 2014 to 2016 BMW 228I
- 2017 to 2021 BMW 230I
- 2021 BMW 430I
- 2018 to 2021 BMW 530E
- 2017 to 2021 BMW 530I
- 2018 to 2019 BMW 540D
- 2020 BMW 540D
- 2017 to 2021 BMW 540I
- 2017 to 2019 BMW 740E
- 2017 to 2021 BMW 740I
- 2016 to 2017 BMW 740LI
- 2020 BMW 745E
- 2018 to 2019 BMW 750I
- 2016 to 2019 BMW 750LI
- 2021 BMW 750LI
- 2020 to 2021 BMW 840I
- 2018 to 2021 BMW B7 ALPINA
- 2018 BMW C 400 X
- 2021 BMW F 850 GS ADVENTURE
- 2017 BMW F800 R
- 2016 to 2021 BMW M2
- 2014 to 2016 BMW M235I
- 2017 to 2021 BMW M240I
- 2015 to 2018 BMW M3
- 2015 to 2020 BMW M4
- 2021 BMW M440I
- 2018 to 2021 BMW M5
- 2017 BMW M550I
- 2018 to 2021 BMW M550I
- 2017 to 2021 BMW M760I
- 2020 to 2021 BMW M8
- 2020 BMW M8 GRAN COUPE
- 2019 BMW M850I
- 2020 to 2021 BMW M850I
- 2019 BMW M850XI
- 2017 BMW R 1200 GS ADVENTURE
- 2018 to 2021 BMW X3
- 2019 to 2021 BMW X4
- 2015 to 2017 BMW X5
- 2019 to 2021 BMW X5
- 2018 BMW X5 M
- 2020 to 2021 BMW X6
- 2015 to 2020 BMW X6 M
- 2019 to 2021 BMW X7
- 2019 to 2021 BMW Z4

## Recalls for the same vehicles and component

- [2021479](/recalls/tc/2021479.md), 2021-08-03: Brakes
- [21V089000](/recalls/nhtsa/21V089000.md), 2021-02-18: SERVICE BRAKES, HYDRAULIC:CRITICAL FASTENERS; SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC
- [2021061](/recalls/tc/2021061.md), 2021-02-10: Brakes
- [21V062000](/recalls/nhtsa/21V062000.md), 2021-02-10: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC; SERVICE BRAKES, HYDRAULIC
- [20V514000](/recalls/nhtsa/20V514000.md), 2020-08-27: EQUIPMENT:OTHER:LABELS; TIRES
- [18V918000](/recalls/nhtsa/18V918000.md), 2018-12-19: EQUIPMENT:OTHER:LABELS
- [18V652000](/recalls/nhtsa/18V652000.md), 2018-09-20: EQUIPMENT:ELECTRICAL
- [2018366](/recalls/tc/2018366.md), 2018-07-06: Brakes
- [18V453000](/recalls/nhtsa/18V453000.md), 2018-07-06: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
- [2018159](/recalls/tc/2018159.md), 2018-04-04: Accessories

## Other bulletins for the same vehicles and component

- [B064725](/bulletins/11024227.md), 2025-10-10, Other: SERVICE BRAKES. Protection Plate Return
- [B661719](/bulletins/11017504.md), 2025-05-02, Service bulletin: SERVICE BRAKES. The vehicle applies the brakes on its own when reversing onto an inclined roadway or driveway. This appliesonly to the situation where the Active PDC option is activated via the iDrive.
- [B340921](/bulletins/11013041.md), 2025-01-23, Service bulletin: SERVICE BRAKES. A turbine\-like noise can be heard from the rear axle while deceleration during the first 300 miles of operation when braking from low speed.
- [B612723](/bulletins/10252023.md), 2024-04-01, Service bulletin: EQUIPMENT. The original Conditioned Based Service \(CBS\) Key data point closed with 23\-07 soft ware, all CBS systems are now collectively under analysis.
- [B511520](/bulletins/10252016.md), 2024-04-01, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Deactivated: Currently investigating other components that maybe playing a factors besides what is mentioned in the SIB. Topic is under investigation.
- [B660720](/bulletins/10250601.md), 2024-03-02, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM. The functionality of the left rear SRR sensor could be reduced which would display the Driving Assistance Check Control Message.
- [B660820](/bulletins/10250600.md), 2024-03-02, Service bulletin: ELECTRICAL SYSTEM; EQUIPMENT. The functionality of the right rear SRR sensor could be reduced which would display the "Driving Assistance"\- Check Control Message.
- [B610524](/bulletins/10249032.md), 2024-02-01, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT; ELECTRICAL SYSTEM. The Central Information Display goes black intermittently due to resets of the Head Unit \(HU\-H3\). FaultB7F8F9 â“ âHU\-H: Resetâ will be stored in the HU\-H3.
- [B541319](/bulletins/10249025.md), 2024-02-01, Service bulletin: EQUIPMENT. The roller sunshade \(aka sun protection or sunblind\) of the front panoramic sunroof is bunching up during operation or may hang down and appear loose.
- [B653423](/bulletins/10245422.md), 2023-12-06, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM. Customers may state that the alarm system \(DWA\) is not active after locking their unoccupied vehicle. Depending on the vehicle’s equipment and settings, no acoustic or optical confirmation \(folding the mirrors/blinking confirmation\) is noticeable. Additionally, the red anti\-theft alarm LED in the interior mirror does not briefly flash every 2 seconds, indicating the alarm is armed.

JSON: [/v1/bulletins/10194298](/v1/bulletins/10194298)

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