Recall 10V504 affects 471,820 2005-2007 Acura Rl and Odyssey vehicles for a brake master cylinder seal leak. Repair is free at any franchised Acura dealer.
Acura is recalling 471,820 2005-2007 Rl and Odyssey vehicles because replacement brake fluid without enough lubricating polymers can dry and curl a seal at the rear of the brake master cylinder. The resulting brake fluid leak can change pedal feel and degrade braking performance, increasing crash risk, and the dealer repair will be free once available.
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What's wrong?
The brake master cylinder in 2005-2007 Acura Rl and Odyssey vehicles is the hydraulic pump for the brake system. When you press the pedal, a piston inside the cylinder pushes brake fluid through the lines so the brakes apply at the wheels. A rubber seal at the rear of the cylinder helps keep that pressurized fluid where it belongs.
The problem starts with brake fluid chemistry. The affected brake system uses fluid that contains polymers, which help lubricate the internal rubber parts. If replacement brake fluid without enough of those polymers is used, the rear rubber seal can dry out. As the piston moves, the dry seal can curl, opening a path for a small amount of brake fluid to leak slowly into the brake booster.
There is no warning sign before failure. Do not rely on a symptom to decide whether this recall applies, because the issue is inside the master cylinder and brake booster.
Who's affected?
Spans Rl and Odyssey vehicles across the 2005, 2006, and 2007 model years, all tied to the hydraulic brake system.
| 2005 Acura Rl | hydraulic brake system |
|---|---|
| 2005 Honda Odyssey | hydraulic brake system |
| 2006 Acura Rl | hydraulic brake system |
| 2006 Honda Odyssey | hydraulic brake system |
| 2007 Acura Rl | hydraulic brake system |
| 2007 Honda Odyssey | hydraulic brake system |
| Units affected | 471,820 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific vehicle.
What's the safety risk?
A brake fluid leak can change brake pedal feel and degrade braking performance over time. That raises crash risk. Schedule the recall repair soon, and treat any brake pedal change or weaker braking as a reason to stop and call the dealer. Repair will be free at any franchised Acura dealer once available.
What should I do?
- Check your VIN to confirm your 2005-2007 Acura Rl or Odyssey is included in this recall.
- Wait for Acura's owner notice, then contact a franchised Acura dealer to schedule the free repair.
- Ask for the brake master cylinder seal replacement that addresses brake fluid leakage into the brake booster.
- Reference recall number 10V504 when you call the dealer.
- Drive cautiously until the repair. Watch for a change in brake pedal feel and leave extra following distance.
What happens at the repair
At the dealer, an Acura technician replaces the brake master cylinder seal at the rear of the master cylinder. That seal helps keep brake fluid out of the brake booster while the piston moves. The dealer repair will be free once available, with parts and labor covered under the recall. The remedy describes seal replacement only, so ask the service desk whether the brake booster also needs inspection when the vehicle is checked in.
Timeline
| October 22, 2010 | NHTSA published the recall |
|---|---|
| December 31, 2010 | Owner notification mailed |
Frequently asked questions
What is recall 10V504?
Recall 10V504 covers 471,820 2005-2007 Acura Rl and Odyssey vehicles with a brake master cylinder seal that can leak brake fluid into the brake booster. The leak can change brake pedal feel and reduce braking performance, increasing crash risk. Acura dealers replace the seal for free.
What should I do if my 2005-2007 Acura Rl or Odyssey is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 10V504. If it is, contact a franchised Acura dealer and ask for the brake master cylinder seal replacement. Reference recall number 10V504 when you call. The dealer repair is free.
Does the recall repair cost anything?
No. Federal recall law requires manufacturers to repair recall defects at no cost, and this recall says dealers replace the brake master cylinder seal free of charge. Parts and labor are covered at a franchised Acura dealer.
What is the safety risk?
The safety risk is reduced braking performance. If brake fluid leaks past the master cylinder seal into the brake booster, the brake pedal feel can change and braking performance can degrade over time, increasing crash risk. Confirm the VIN, then schedule the free dealer repair.
What if I bought this vehicle used?
The free recall repair still applies. Recall coverage follows the VIN, not the first owner, so a used 2005-2007 Acura Rl or Odyssey still qualifies when its VIN is included. Check your VIN, then call an Acura dealer with recall number 10V504.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/10V504000 |
|---|---|
| Acura customer service | 1-800-999-1009 |
| NHTSA recall # | 10V504 |
| NHTSA recall # (full) | 10V504000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Recall Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Defect / Noncompliance Notice (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 3, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →