Mercedes-Benz first blamed muggy weather. Now it’s blaming the hose itself.
Mercedes-Benz USA has expanded its front brake hose recall for the 223-generation S-Class to 30,078 cars, according to its Part 573 filing with NHTSA (recall 26V638). That’s roughly 10,000 more than the first round, and the new campaign covers every U.S. car built from February 2, 2021 through November 28, 2024. Mercedes estimates the defect is present in 100 percent of them.
The breakdown
The filing covers the 2022–2025 S 580 4MATIC (16,881 cars), S 500 4MATIC (7,143), S 580 e 4MATIC (2,277), AMG S 63 E Performance (1,760), Maybach S 680 (1,070) and Maybach S 580 (947). So the V12 Maybach, the 791-horsepower plug-in AMG and the volume S 580 all share the same weak link, a front hose from Continental with part number A2234201800.
From climate theory to fatigue
The original campaign, 25V116, launched in early 2025 and covered 20,339 S-Classes. Mercedes’ dealer bulletin at the time said the hoses “might leak over time with use in hot and humid environments.” The population was drawn around climate and a specific production window.
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The new filing’s chronology shows how that theory unravelled. Between March and August 2025, Mercedes received field reports from markets outside the U.S. involving cars built outside the original window, some of them driven nowhere near the humid regions it had flagged. Mercedes collected failed hoses through a field engineering program, had Continental test them, and reviewed the results in July 2026. The revised diagnosis is accumulated material fatigue from thermal and mechanical stress over the vehicle’s life. The hose wears out whether the car lives in Miami or Minneapolis.
Mercedes made the expansion decision on September 25, 2026. It cites three U.S. reports from the expanded population, dated April, May and August 2026, and says it knows of no crashes, injuries or property damage.
The recall isn’t U.S.-only. Hong Kong’s Transport Department lists a running front brake hose campaign for the 223 S-Class.
Why a hose matters on a 5,000-pound sedan
A brake hose is the flexible rubber section between the rigid steel brake lines and the caliper. It has to bend with every steering input and suspension movement while sitting next to brake hardware that gets very hot under repeated stops. Those two loads are exactly what Mercedes now says wore the material out.
Modern cars split their hydraulics into two circuits, so one leaking hose shouldn’t leave you with no brakes. It does leave you with less. Expect a longer, softer pedal and longer stopping distances, in a large, heavy sedan that many owners use for high-speed highway driving.
The uncomfortable part, in Mercedes’ own words: “Before the issue occurs, the driver will not receive a warning due to the nature of the failure mechanism.” The first sign is a red brake fluid warning in the instrument cluster once fluid is already escaping.
What owners should do
Dealers were scheduled to be notified October 9, 2026, and owner letters go out November 27, 2026. The fix is new front-axle brake hoses, installed free. Mercedes says hoses built from November 29, 2024 onward use an optimized design.
Until your appointment, treat a red brake fluid warning, a sinking pedal or fluid near a front wheel as a stop-driving-now problem. If you’d rather not wait for November, ask your service advisor to inspect the front hoses at your next visit.
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One detail is worth checking. The filing says Mercedes doesn’t plan to notify owners about reimbursement for repairs done before the recall, on the grounds that these vehicles “would not have been previously subject to the condition.” If you already paid out of pocket for a front hose or brake fluid leak on one of these cars, keep the invoice and ask Mercedes customer care anyway.
Used-car buyers
A 2022–2025 S-Class is now heavily depreciated, which makes it tempting second-hand. Run the VIN through NHTSA’s recall lookup before signing anything. A 2025 model year car doesn’t guarantee the new hose, because the cut-in is based on build date, so check the door-jamb label. And if a car went through the first campaign, confirm with a dealer whether it needs a second visit under 26V638. Don’t assume.
The first recall drew its line around the weather. The second covers every U.S. car built before the redesigned hose. Had a front hose leak on a 223 S-Class? Did Mercedes pay, or are you holding an invoice it says it won’t reimburse?