Description
Genuine OEM low air pressure switch from Freightliner. The FSC1749-1121 is a normally-open switch that closes to trigger the low-air warning, with a 2-blade terminal and 1/8 in MPT thread.
Specifications
| Manufacturer | Freightliner |
|---|---|
| Part Number | FSC1749-1121 |
| Part Type | Low Air Pressure Switch |
| Operation | Normally Open |
| Setpoint | 2-6 PSI |
| Terminal | 2-blade |
| Thread | 1/8 in MPT (1/8-27 NPT) |
Cross References
This part replaces or is equivalent to the following part numbers:
- Automann: 577.99535
Applications
This switch is used for:
- Low-air-pressure warning on Freightliner air-brake systems
Verify your make, model, engine, and configuration before ordering to confirm fitment.









