BMW bulletin B340714
What it saysINFORMATION ""M"" vehicles are designed for high-performance, spirited driving. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Oct 13, 2023, received Jan 7, 2019, about the service brakes — 2 documents under this number. It names 45 model years (2016–2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communication"Carbon Ceramic Brake Noise. INFORMATION ""M"" vehicles are designed for high-performance, spirited driving. To accommodate this type of driving profile, a braking system which exceeds the standards for handling heavy brake forces, extreme temperatures, and excellent stopping power at high speeds is required. ""M"" vehicles can be ordered with the optional ultra high-performance braking system, featuring perforated carbon ceramic brake discs designed for circumstances similar to those encountered on racetracks. The carbon ceramic brakes were designed to improve braking efficiency, and dramatically increase braking performance along with a significant reduction in weight. When developing the carbon ceramic brake system, the main focus was on braking performance for the sporty-minded driver, while accepting the comfort limitations of functional noises at slower speeds and when coming to a stop. Please inform the customer that the carbon ceramic brake system's functional noises (squealing/honking), are a known characteristic for this type of material, and are only a small trade-off for the improved braking performance. These functional noises have no effect on the performance, operational reliability and durability of the brakes. Part replacement will not provide a remedy for the noise; this is a known characteristic of the high-performance brake system. More information on the performance and operation of these brakes can be found in the Owner's Manual under ""M carbon ceramic brake."" WARRANTY INFORMATION Not applicable."
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B340714 | Service bulletin | Oct 13, 2023 | 10244237 | PDF, 85 KB |
| B340714 | Service bulletin | Nov 1, 2018 | 10152664 | not found |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2023 BMW M 1000 R; 2021 BMW M 1000 RR; 2022 BMW M 1000 RR; 2023 BMW M4 GT4; 2017 BMW M760LI; 2018 BMW M760LI; 2020 BMW M760LI; 2021 BMW M760LI; 2022 BMW M760LI; 2018 BMW M850I; 2019 BMW M850XI; 2016 BMW R1200 S Adventure.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 33 model years this bulletin names have filed 575 complaints with NHTSA since 2015. 9 of them name Service Brakes — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
I pulled my 2019 BMW 740i out of a residential garage and stopped the vehicle. I opened the driver's door and exited the vehicle to enter the code on the exterior garage keypad to close the garage door. After entering the code, I turned around to return to the vehicle and observed that the BMW had begun moving unexpectedly.
2019 BMW 7 Series · Service Brakes · filed with NHTSA Aug 7, 2026 · ODI 11755580
I have this model 2023 with about 6000 miles which makes a noise when in reverse. I have the same model year 2021 which has 25000 miles. The dealer states the brakes and rotors may have issues on the 25000 . If this occurs on a same model type two years apart and 19000 mile difference this is questionable.
2023 BMW 2 Series · Service Brakes · filed with NHTSA May 29, 2024 · ODI 11591319
The contact owned a 2023 BMW 525i. The contact stated that while the vehicle was at the mouth of the garage, his foot slipped off the brake and onto the accelerator pedal, and he drove through the rear garage wall into the kitchen and crashed into the concrete block. The electrical circuit was damaged.
2023 BMW 3 Series · Service Brakes · filed with NHTSA Dec 5, 2025 · ODI 11703295
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the service brakes
Source: same model, same component group20 other manufacturer communications filed against these BMW models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the BMW list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 0034410300 | Service campaign | Aug 27, 2026 | The protective film which covers the 6 threaded connection holes on the DSC hydro unit may not have been completely removed before the brake… |
| B320426 | Service campaign | Jul 23, 2026 | Hydro Unit DSC |
| B062826 | Other | Apr 24, 2026 | Brake Hose Return |
| B340925 | Service bulletin | Dec 17, 2025 | There may be an internal leakage in the brake fluid expansion tank (aka brake fluid reservoir). In the rarecase of a leak, the filling level… |
| MC340011 | Service campaign | Dec 4, 2025 | During a quality inspection it was discovered that some front brake lines may have corrosion. |
| B064725 | Other | Sep 9, 2025 | Protection Plate Return |
| 0034220300 | Service campaign | Aug 22, 2025 | The parking brake actuator has not been wound correctly so that it cannot be applied or released. Check Control message “Parking brake faile… |
| 0034200300 | Service campaign | Jul 30, 2025 | There may be an internal leakage in the brake fluid expansion tank (aka brake fluid reservoir). In the rare case of a leak, the filling leve… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for BMW, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is BMW B340714 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the B340714 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every BMW warranty extension on file lists the ones BMW has filed.
Which vehicles does B340714 cover?
The manufacturer filed it against 45 model years: 2023 BMW 2 Series, 2022 BMW 2 Series, 2020 BMW 2 Series, 2018 BMW 2 Series, 2017 BMW 2 Series, 2016 BMW 2 Series and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.