Description
PAI 450548 is the aftermarket low-pressure parking brake light switch for International / Navistar trucks, replacing Navistar 598860 / 598860C1 and Freightliner FSC17493110. Normally-open switch that closes at 5 PSI — mounts in the parking brake air line and lights the dash brake-set indicator and brake lamps when the parking brake is set and air pressure drops below the threshold. 1/4″-18 NPT thread with pre-applied locking compound.
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 450548 |
| Replaces (OEM) | Navistar 598860 / 598860C1 |
| Part Type | Parking Brake Light Switch (low-pressure air switch) |
| Switch Action | Normally Open; closes at 5 PSI |
| Thread Size | 1/4″ – 18 NPT (with locking compound) |
| Color / Finish | Silver / Black |
| Application | International / Navistar (universal) |
Cross References
This brake light switch replaces or is equivalent to the following part numbers:
- Navistar (International): 598860, 598860C1
- Freightliner: FSC17493110, 17493110, 1749-3110
- Mack: 4333-598860C1
- PAI Industries: 450548
- Also known as: S-9093
Applications
This switch fits International / Navistar conventional trucks and select Freightliner / Mack chassis using the 598860 envelope, including:
- International 4700, 5000, 8000, 8300 series and similar conventionals
- Navistar medium- and heavy-duty trucks specifying 598860C1
- Freightliner chassis using FSC17493110
- Mack chassis specifying 4333-598860C1
Verify thread size, port location, and switch action (normally open vs. normally closed) on the failed unit before ordering. Air-system pressure switches with similar bodies are not interchangeable across actions or pressure thresholds.
