Acura Ilx: Service brakes — master cylinder

Affects Acura Ilx · 2016–2020 — about 71K vehicles.

The hazard

Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.

What to do

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.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational