NHTSA 25V859000Manufacturer no. RN5
Service Brakes, Hydraulic › Foundation Components › Master Cylinder
- Report received by NHTSA
- December 11, 2025
- Owner notification
- May 1, 2026
- Recall initiated by
- NHTSA Office of Defects Investigation
- Units potentially affected
- 70,658 (whole campaign)
- Model names in the NHTSA record
- ILX
Defect 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.
Source: NHTSA recall 25V859000, filed by Honda (American Honda Motor Co.). View the campaign on NHTSA.gov