Honda Recalls Acura ILX Models Due to Master Cylinder Defect

Brake parts distributors and wholesalers in Europe and America, please take note!—Honda’s got a recall notice out for Acura ILX models, and it’s all about a finicky brake master cylinder issue. As a trusted car auto brake supplier, Hipsen brake is here to walk you through what this means for your business—and how we can help you keep your customers covered.

News Summary

First, the basics: Honda’s recalling over 70,000 Acura ILX sedans (model years 2016-2020, though some 2014-2020 units are also in the mix—total 70,658 vehicles) because of a brake master cylinder seal problem. Blame it on “plasticizer contamination” from the brake fluid reservoir hose—fancy terms for “a chemical in the hose is messing up the seal.” The NHTSA’s given this recall number 25V859, and Honda’s calling it RN5 if you need to reference it.

Reasons why Honda Acura ILX models were recalled

Let’s get nerdy (but fun) with the defect: Residual plasticizer from the reservoir hose seeps into the brake fluid, making the secondary seal in the brake master cylinder swell up like a sponge in water. Then, add engine heat to the mix, and that swollen seal expands even more—bad news for sealing. This leads to brake fluid leaks, squishy brake pedals, and longer stopping distances. Yikes, right? Honda says the issue cropped up because they assembled the vehicles too soon after making the reservoir hose, leaving too much plasticizer behind.

The problematic part here is the master cylinder assembly, part number 46100-TV9-A02, made by Tier 1 supplier Astemo Ueda, Ltd. out of Japan. The good news? No injuries have been reported yet. Honda first heard complaints about wonky brake pedal pressure back in 2015, and as of December 5, In 2025, they’ve handled 192 warranty claims related to this issue.

Acura ILX model brake master cylinder solution

So, what’s the fix? Authorized Acura dealers will swap out the faulty brake master cylinder with a redesigned one—this time with a seal made of different materials that won’t throw a fit from plasticizer. Dealer notifications go out December 12, 2025, and owners will get temporary letters by February 2, 2026. Pro tip: The Acura ILX is already discontinued, so getting replacement parts fast will be key for your customers.

Looking for a reliable Honda master cylinder supplier

This is where Hipsen brake comes in. As one of the top car brake companies and a reliable car auto brake supplier, we stock high-quality, durable brake master cylinder components that fit Honda models. Whether you need to replenish your inventory for the recall rush or want to offer a trusted alternative to OEM parts, we’ve got you covered. Our parts are built to avoid these kinds of pesky defects—no swollen seals or leakage headaches here.

Don’t let a recall slow down your business. Stock up on reliable Honda brake master cylinder parts from Hipsen today. Reach out now: Email contact@hbsparts.com or shoot a WeChat/WhatsApp to +86 18357061187. We’ll help you keep your customers safe and satisfied—no recall stress required.