# Honda (American Honda Motor Co.): Reduced Brake Function (25V859000)

**Recall Urgency Score:** 45/100

| Field | Value |
|---|---|
| Manufacturer | Honda (American Honda Motor Co.) |
| Subject | Reduced Brake Function |
| NHTSA ID | 25V859000 |
| Manufacturer campaign | RN5 |
| Recall type | Vehicle |
| Component | SERVICE BRAKES, HYDRAULIC |
| Units potentially affected | 70658 |
| Do not drive | No |
| Park outside | No |
| Defect | 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. |
| Consequence | 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. |

## Why this score
- Safety-critical component (service brakes).
- 70,658 units affected.

Source: U.S. National Highway Traffic Safety Administration (NHTSA) recalls, via data.transportation.gov (https://www.nhtsa.gov/recalls?nhtsaId=25V859000). Last refreshed: 2026-11-04T18:12:01.520Z.
Recall data comes from NHTSA and is summarized automatically; check the official notice and VIN lookup before acting. Informational only.