GM service campaign N252494220
What it saysCertain vehicles listed above may have a condition in which braking performance is reduced, vehicle top speed is limited, and MIL notification is provided to the customer. NHTSA’s full summary ↓
GM filed this with NHTSA as a service campaign dated Jun 26, 2025, about the service brakes. It names 4 model years across Chevrolet, GMC and Cadillac (2025). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Service Update. Certain vehicles listed above may have a condition in which braking performance is reduced, vehicle top speed is limited, and MIL notification is provided to the customer. Dealers are to replace the brake master cylinder assembly.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N252494220 | Service campaign | Jun 26, 2025 | 11019781 | PDF, 128 KB |
What the document itself lists
The manufacturer titles it “N252494220 - Service Update”.
Parts the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 85695661 | VALVE KIT, ELEK TRACT CONT BRK PRESS MOD (Corvette W/ RPO JL9 or J55) | — |
| 85695662 | VALVE KIT, ELEK TRACT CONT BRK PRESS MOD (Corvette W/ RPO J58) | — |
| 85165043 | RESERVOIR KIT, BRK M/CYL (Corvette) | — |
| 86539201 | BRACKET, BRK M/CYL (Corvette) | — |
| 84364629 | RETAINER, BRK PED PUSH ROD (Corvette) | — |
| 26569958 | VALVE KIT, ELEK TRACT CONT BRK PRESS MOD (Equinox/Terrain) | — |
| 84857010 | RESERVOIR KIT, BRK M/CYL (Equinox/Terrain) | — |
| 26539133 | RETAINER, BRK PED (Equinox/Terrain) | — |
| 84894475 | RESERVOIR KIT, BRK M/CYL (XT4) | — |
| 84567897 | RETAINER, BRK PED PUSH ROD (XT4) | — |
| 19299570 | FLUID-BRAKE (DOT 4) (US) | — |
| 19299571 | FLUID-BRAKE (DOT 4) (CAN) | — |
Read by machine from the document NHTSA serves (3 pages), read Sep 30, 2026. A part number is shown only where it matches GM’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.
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 themChevrolet 2 model years
GMC 1 model year
Cadillac 1 model year
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 4 model years this bulletin names have filed 441 complaints with NHTSA since 2015. 57 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.
On 3/21/2026 @ approximately 1:45 PM I was driving down a local road @ approximately 25MPH. While approaching a stop sign, I attempted to stop the vehicle, I applied the brakes and the brake pedal dropped serval inches and became hard felt like it hit the floor of the vehicle. The vehicle continued through the intersection.
2025 Chevrolet Corvette · Service Brakes · filed with NHTSA Mar 23, 2026 · ODI 11726366
Two problems with this vehicle: 1) Transmission occasionally slips on the 2-3 shift which the dealer says he cannot duplicate. Vehicle was brought in four times for this problem. According to the dealer GM corporate has stated the transmission is working within normal parameters, since no codes were found.
2025 GMC Terrain · Service Brakes · filed with NHTSA Aug 29, 2026 · ODI 11760586
On July 28, 2025, while driving the vehicle on public street, a warning flashed that the brakes have failed. In fact the brakes were totally inoperative. Driver was able to clear traffic and exit the roadway without incident.
2025 Cadillac XT4 · Service Brakes · filed with NHTSA Apr 4, 2026 · ODI 11729189
In depth: 2025 Chevrolet Equinox brake problems →
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 group19 other manufacturer communications filed against these GM models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N262545360-01 | Service campaign | Oct 20, 2026 | Service Update. Certain vehicles listed above may experience a condition in which the Anti-Lock Braking System (ABS) may be perceived as ac… |
| N262545360 | Service campaign | Oct 7, 2026 | Service Update. Certain vehicles listed above may experience a condition in which the Anti-Lock Braking System (ABS) may be perceived as ac… |
| N252528241-01 | Service campaign | Jul 23, 2026 | Certain vehicles listed above may have a condition in which the vehicle experiences a reduction in deceleration during a low-speed ABS braki… |
| N252528241 | Service campaign | May 4, 2026 | Certain vehicles may have a condition in which the vehicle experiences a reduction in deceleration during a low-speed ABS braking event when… |
| 24-NA-221 | Service bulletin | Nov 7, 2025 | This service bulletin provides service procedure information on Brake Squeal or Squeak Noise Intermittently on Initial Brake Applies. |
| N252519910 | Service campaign | Aug 27, 2025 | Certain vehicles may have a condition in which the Front Right Brake Line Fitting is torqued under specification. Dealers are to tighten the… |
| 25-NA-030 | Service bulletin | Feb 13, 2025 | This service bulletin provides repair information to correct a customer concern of hearing a squeak type noise when applying the brake pedal… |
| 24-NA-048 | Service bulletin | Feb 6, 2025 | This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engine… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, GMC and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N252494220 a recall?
No. A service campaign 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 N252494220 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does N252494220 cover?
The manufacturer filed it against 4 model years across 3 brands (Chevrolet, GMC and Cadillac): 2025 Cadillac XT4, 2025 Chevrolet Corvette, 2025 Chevrolet Equinox, 2025 GMC Terrain. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.