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Acura ILX brakes can weaken from an internal leak

NHTSA campaign 25V859000 · Reported 2025-12-11 · Honda (American Honda Motor Co.)

high How serious is it? About this label

Reduced braking and longer stopping distances raise the risk of a crash; the notice does not say to stop driving, but do not put this repair off.

What's wrong, in plain English

Contaminated brake fluid can make a seal inside the part that pushes fluid to your brakes change shape. Once that seal is deformed, fluid leaks inside the part instead of doing its job, and the brakes get weaker. You could need more distance to stop than you expect, especially in an emergency. Honda dealers will replace that part for free. VIN lookup opens December 17, 2025, and owner letters were mailed May 4, 2026.

What you should do

1. Enter your VIN at nhtsa.gov/recalls to confirm your ILX is covered.
2. Contact your Acura dealer or Honda customer service at 1-888-234-2138 and reference recall RN5.
3. Have the brake part replaced — the repair is free.

Affected vehicles (3)

2018 Acura ILX
2019 Acura ILX
2020 Acura ILX

Who to contact

Acura — official Acura recall lookup

Customer service: 1-888-234-2138

Any franchised dealer for the brand can do the repair. Phone numbers are taken from manufacturer sites and recent NHTSA notices; if one has changed, the number in your own recall letter is the one to use.

The bigger picture

Acura brake recalls: leaks, loose pedals and sudden pressure loss · all 6 Acura recalls in this area

Official notice

Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER
Summary: Honda (American Honda Motor Co.) is recalling certain 2016-2020 Acura ILX vehicles. Contaminated brake fluid may cause a seal inside the brake master cylinder to deform, which can cause an internal brake fluid leak and reduce brake function.
Safety risk: Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.
Remedy: Dealers will replace the brake master cylinder, free of charge. Owner letters were mailed May 4, 2026. Owners may contact Honda's customer service at 1-888-234-2138. Honda's number for this recall is RN5. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning December 17, 2025. The information in your report suggests that Honda (American Honda Motor Co.) may have been aware of this issue more than five business days before filing a report with NHTSA. Please be reminded that under Federal law, this agency is to be notified of all safety defect and/or noncompliance decisions within five business days. 49 CFR 573.6 Significant civil penalties can be assessed for this violation.

Verify your specific vehicle by VIN at nhtsa.gov. Recall repairs are free of charge by law.