Recall 20V499 affects 172 2020 Oshkosh S-Series vehicles for brake pressure switch air leaks. Repair is free at any franchised Oshkosh dealer.
Oshkosh is recalling 172 2020 S-Series vehicles because Bendix pressure switch threads can strip under pressure and cause an air leak in the brake air system. The leak can affect braking, engage the parking brake, or disable brake lights; Oshkosh dealers will complete the repair free of charge.
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What's wrong?
The SL-4 stop light switch on the 2020 Oshkosh S-Series is a pressure switch used with the air brake system. When the brakes are applied, the switch responds to air pressure and helps turn on the brake lights. The air system also depends on sealed fittings and switches to hold pressure while the truck is braking.
On affected trucks, the plastic threads that hold the two halves of the switch together can strip when the switch is pressurized. Once those threads are damaged, the switch housing can leak air. A severe leak can lower air system pressure when the brakes are applied, and failure of the front and rear brake switches also stops the brake lights from working.
There is no warning sign before failure. The issue is inside the switch housing, so the first visible problem is an air leak or brake lights that no longer respond when the brakes are used.
Who's affected?
The same SL-4 stop light switch is tied to brake-light, parking-brake, and air-brake systems in this recall.
| 2020 Oshkosh S-Series | Switch |
|---|---|
| 2020 Oshkosh S-Series | Air |
| 2020 Oshkosh S-Series | brake system |
| Units affected | 172 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A brake pressure switch air leak can affect braking distance, trigger automatic parking brake engagement, or leave brake lights inoperative if affected switches fail on both the front and rear brakes. There is no warning sign before failure, so schedule the inspection and repair soon. Repair is free at any franchised Oshkosh dealer.
What should I do?
- Check your VIN to confirm your 2020 Oshkosh S-Series is included in this recall.
- Contact a franchised Oshkosh dealer to schedule the free brake pressure switch inspection and replacement, which fixes the air leak tied to brake pressure loss and brake light failure.
- Bring the recall notice if you have it. Reference recall number 20V499 when you call.
- Drive cautiously until the repair is complete. Leave extra stopping distance and watch for brake light problems.
What happens at the repair
At the dealer, an Oshkosh technician inspects the brake pressure switch, looking for stripped plastic threads or an air leak under pressure, and replaces the switch if it does not pass inspection. The recall repair is free, and parts and labor are covered. Oshkosh has a general reimbursement plan on file for owners who already paid for this repair before the recall notice. Bring repair paperwork and payment documentation to the service desk, or contact Oshkosh customer service at 1-888-686-7278 to start the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| August 24, 2020 | NHTSA published the recall |
|---|---|
| September 14, 2020 | Interim owner notification (was planned for this date) |
| September 28, 2020 | Owner notification mailed |
Frequently asked questions
What is recall 20V499?
Recall 20V499 covers 172 2020 Oshkosh S-Series vehicles with Bendix pressure switches that can leak air when pressurized. A severe leak can reduce braking performance, engage the parking brake, or stop the brake lights from working, increasing crash risk.
What should I do if my 2020 Oshkosh S-Series is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 20V499. If it is, contact a franchised Oshkosh dealer for a brake pressure switch inspection and replacement if needed. Reference recall number 20V499 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to perform the recall repair at no cost, and Oshkosh dealers will inspect the brake pressure switch and replace it as necessary free of charge.
Is it safe to drive my 2020 Oshkosh S-Series before the repair?
This recall does not include a do-not-drive instruction. The safety concern is an air leak that can reduce braking performance, engage the parking brake, or disable brake lights. If you notice braking changes, air pressure loss, parking brake engagement, or brake light problems, contact Oshkosh customer service at 1-888-686-7278.
When did the Oshkosh S-Series recall repair begin?
The recall repair began September 28, 2020. Oshkosh dealers inspect the brake pressure switch and replace it as necessary. If you never received a notice, check your VIN and reference recall number 20V499 when you contact the dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/20V499000 |
|---|---|
| Oshkosh customer service | 1-888-686-7278 |
| NHTSA recall # | 20V499 |
| NHTSA recall # (full) | 20V499000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 24, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →