# NHTSA Recall 21V953000 — Completion Reports
> **Parking Brake May Release Unexpectedly** · Mack Trucks, Inc. · Recalled 2022-02-08
## Latest status
- **Affected units:** 20,668
- **Remedied:** 10,706 (51.8%)
- **Unreachable owners:** 0
- **Removed from recall:** 0
- **Latest report:** 2024-01-04 (2023-4)
- **Quarters reported:** 8
## Quarterly progress
| Period | Affected | Remedied | Unreachable | Removed | Completion % | Reported |
|--------|----------|----------|-------------|---------|--------------|----------|
| 2022-1 | 20,668 | 4,714 | 0 | 0 | 22.81% | 2022-04-07 |
| 2022-2 | 20,668 | 6,651 | 0 | 0 | 32.18% | 2022-06-30 |
| 2022-3 | 20,668 | 8,038 | 0 | 0 | 38.89% | 2022-10-05 |
| 2022-4 | 20,668 | 9,059 | 0 | 0 | 43.83% | 2023-01-12 |
| 2023-1 | 20,668 | 9,586 | 0 | 0 | 46.38% | 2023-04-10 |
| 2023-2 | 20,668 | 10,082 | 0 | 0 | 48.78% | 2023-07-13 |
| 2023-3 | 20,668 | 10,436 | 0 | 0 | 50.49% | 2023-10-11 |
| 2023-4 | 20,668 | 10,706 | 0 | 0 | 51.8% | 2024-01-04 |
## Source
- [NHTSA recall page](https://www.nhtsa.gov/recalls?nhtsaId=21V953000)
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