Porsche bulletin No. 146-21
What it saysInformation on symptom-based workshop manual - PSCB disc brakes. NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Sep 4, 2024, received Nov 5, 2021, about the service brakes — 2 documents under this number. It names 5 model years (2020–2024). 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 communicationInformation on symptom-based workshop manual - PSCB disc brakes. Noises from around the front axle.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| No. 146-21 | Service bulletin | Sep 4, 2024 | 11006857 | PDF, 318 KB |
| No. 146-21 | Service bulletin | Oct 28, 2021 | 10203135 | PDF, 265 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 9J1419647B | — | — | |
| 9J1419647C | — | — | |
| 9Y0615301AF | — | — | |
| 9Y0615302AF | Front axle, right | — | eBay Motors → |
| 9Y0698151AQ | Brake calliper on front axle | — | eBay Motors → |
| 9J1698151M | Brake calliper on front axle | — | eBay Motors → |
Read by machine from the document NHTSA serves (5 pages), read Sep 30, 2026. A part number is shown only where it matches Porsche’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the disc for the 2024 Taycan →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themA 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 5 model years this bulletin names have filed 277 complaints with NHTSA since 2015. 26 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.
The contact owns a 2020 Porsche Taycan 4S. The contact received notification of NHTSA Campaign Number: 24V455000 (Service Brakes, Hydraulic); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
2020 Porsche Taycan · Service Brakes · filed with NHTSA Oct 1, 2024 · ODI 11617476
When the forward collision warning activates, the braking pedal loses its effectiveness and causes the car to brake much more slowly than it should, which actually increases the chance of a collision occurring. This has happened multiple times to me in the past few weeks. It is a very dangerous problem
2023 Porsche Taycan · Service Brakes · filed with NHTSA May 11, 2026 · ODI 11736999
There was a different amount of pressure needed to apply to the break when at lower speeds vs higher speeds. At lower speeds there was less responsiveness to the breaks and more pressure was required to stop the car. We brought the car to the dealer and dealer reported the car was fine.
2022 Porsche Taycan · Service Brakes · filed with NHTSA Jul 29, 2022 · ODI 11476620
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 group16 other manufacturer communications filed against the Porsche Taycan under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| No. 90-21 | Service bulletin | Mar 24, 2026 | Symptom-based workshop manual for the brake symptom. brake pedal travel perceived as "too long" just before vehicle comes to a standstill. |
| No. 105-25-1 | Service bulletin | Jan 12, 2026 | Technical information for Active Malfunction Indicator Light in Conjunction with Fault Memory Entries Regarding Brake Booster "U01B400" and… |
| No. D752 | Service bulletin | Jan 5, 2026 | Parts information for parts withdrawal involving the caliper without brake pads. The part numbers affected are in the attached PDF. The vehi… |
| No. 2530 | Service bulletin | Dec 5, 2025 | Instructions on advanced technical information for Y1A, 971, 9YB, 9YA – Brake Noise & Long Brake Pedal |
| No. D749 | Service bulletin | Nov 18, 2025 | Parts information for parts withdrawal involving the brake disc 9Y0615301AJ |
| D719 | Service bulletin | May 5, 2025 | Parts information for Parts Withdrawal - 1 Set of Brake Pads for Disk Brake. Vehicles included are all cars that use part number 992698451R |
| D712 | Service bulletin | Mar 11, 2025 | Parts Information - Parts Withdrawal - Brake Hose & Retainer for Brake Hose |
| No. 187-24 | Service bulletin | Nov 15, 2024 | Technical information for a Creaking Noises when Releasing the Footbrake: Observe Specified Procedure |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Porsche, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Porsche No. 146-21 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 No. 146-21 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 Porsche warranty extension on file lists the ones Porsche has filed.
Which vehicles does No. 146-21 cover?
The manufacturer filed it against 5 model years: 2024 Porsche Taycan, 2023 Porsche Taycan, 2022 Porsche Taycan, 2021 Porsche Taycan, 2020 Porsche Taycan. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.