Recall 16V523 covers 4 2016-2018 Manac Van Trailer and Flatbed trailers with delayed spring-brake application. Repair kit is free from Manac.
Manac is recalling 4 2016-2018 Van Trailer and Flatbed trailers because certain Bendix SR5 spring brake valves can delay parking brake application. After the trailer is decoupled from the tractor, that delay can let it roll away, raising crash or injury risk; the Manac dealer repair will be free once available.
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What's wrong?
The SR-5 spring brake valve in the 2016-2018 Manac Van Trailer and Flatbed parking brake system controls air flow to the spring brakes. On an air-brake trailer, those springs apply the parking brakes when air pressure is released, so the trailer stays parked after it is disconnected from the tractor.
On affected trailers, a check valve seat inside the Bendix valve was machined from a supplier drawing that left out a radius dimension. That shape error interferes with how the valve exhausts air. When the driver sets the parking control, the spring brakes can take longer to apply, leaving the trailer slow to park.
The slow-to-park condition can happen without a separate warning sign beyond the air leak described here. Before the tractor is decoupled, an affected trailer can have an audible air leak from the dash-mounted park control valve or from the red glad hand after it is disconnected. The leak continues until the trailer reservoirs and spring brake chambers lose air pressure.
Who's affected?
Covers both Van Trailer and Flatbed models across the 2016, 2017, and 2018 model years, with the parking brake as the shared component.
| 2017 Manac Van Trailer | Parking brake |
|---|---|
| 2018 Manac Van Trailer | Parking brake |
| 2016 Manac Flatbed | Parking brake |
| Units affected | 4 |
| Field incidents | NHTSA has logged no field incidents to date. |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific trailer is included.
What's the safety risk?
A delayed spring brake application can let the trailer roll away after it decouples from the tractor, increasing the risk of a crash or injury. Before decoupling, listen for an air leak at the dash mounted park control valve or red glad hand, then keep the trailer secured and arrange the remedy. Repair will be free at any franchised Manac dealer once available.
What should I do?
- Check your VIN to confirm your 2016-2018 Manac Van Trailer or Flatbed is included in this recall.
- Contact Manac customer service at 1-418 228-2018 to ask for the free remedy kit for the Bendix SR5 spring brake valve.
- Reference recall number 16V523 when you call.
- Install the free remedy kit using Manac's instructions; it repairs affected SR5 spring brake valves tied to delayed parking-brake application.
- Secure the trailer against movement before decoupling it from the tractor until the repair is complete.
What happens at the repair
Manac's listed remedy is a repair kit for affected SR-5 trailer relay valves, with instructions supplied to owners at no charge. Because the remedy status is still marked under development, do not assume the final repair can be scheduled until Manac confirms the kit or service path for your trailer. Once available, the repair is free. If you already paid for a related SR-5 relay valve repair before the recall notice, contact Manac with your repair documentation under its reimbursement plan.
| Reimbursement | Reimbursement available |
|---|
Timeline
| July 11, 2016 | NHTSA published the recall |
|---|---|
| September 2, 2016 | Owner notification mailed |
Frequently asked questions
What is recall 16V523?
Recall 16V523 covers 4 2016-2018 Manac Van Trailer and Flatbed trailers equipped with Bendix SR-5 spring brake valves that were improperly machined. The defect can delay spring brake application while parking, creating rollaway risk after the trailer decouples from the tractor.
What should I do if my 2016-2018 Manac Van Trailer or Flatbed is on this recall?
Check your VIN to confirm your specific trailer is included in recall 16V523. If it is, contact Manac at 1-418 228-2018 or a franchised Manac service contact for the SR-5 trailer relay valve remedy kit and repair instructions. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to correct safety defects at no cost to owners. Manac provides the SR-5 trailer relay valve remedy kit, complete with repair instructions, free of charge for trailers included in recall 16V523.
What is the safety risk?
The safety risk is trailer rollaway after the trailer has decoupled from the tractor. If spring brake application is delayed while parking, the trailer can move unexpectedly, increasing the risk of a crash or injury. Confirm inclusion by VIN before arranging the free remedy.
What if I bought this Manac trailer used?
The free recall remedy still applies. Recall coverage follows the trailer, not the first owner. Check your VIN to confirm whether your used Manac Van Trailer or Flatbed is included, then reference recall 16V523 when you contact Manac or the service location.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/16V523000 |
|---|---|
| Manac customer service | 1-418 228-2018 |
| NHTSA recall # | 16V523 |
| NHTSA recall # (full) | 16V523000 |
Source documents
-
Download Owner Notice (PDF) - Download Recall Report (PDF)
- Download Quarterly Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 31, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →