QR-1 Quick Release Valve
- Decreases the release time on a brake application.
- Exhausts air through itself rather than through the controlling valve.
| Make | Series |
| International | ProStar (No Year) |
| Kenworth | T660 (No Year) |
| Peterbilt | 379 (No Year) |
| Peterbilt | 379 (Unspecified.) |
| Kenworth | T660 (Unspecified.) |
| International | ProStar (Unspecified.) |