Description
PAI 740250 is a normally-closed cruise-kickoff low air pressure switch that opens at 2-6 PSI to disable cruise control when the brake system loses pressure on Freightliner Class 8 trucks. With a 1/8-27 NPT thread and 2-blade connector, it is a direct aftermarket replacement for Freightliner FSC1749-2134 and crosses to Automann 577.46604, Newstar S-20678, and World American WA06-0025.
Signs You Need a New Low Air Pressure Switch
- Cruise control fails to engage or kicks off unexpectedly
- Low air warning light stays on or fails to illuminate
- Cruise control still active when air pressure is low (dangerous)
- Intermittent or erratic cruise control behavior
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 740250 |
| Part Type | Low Air Pressure Switch (Cruise Kickoff) |
| Switch Type | Normally Closed (NC) |
| Actuation Pressure | Opens at 2-6 PSI |
| Thread Size | 1/8-27 NPT |
| Connector Type | 2-Blade |
| Overall Length | 1.95 in (5.0 cm) |
| Finish | Gold |
| Warranty | 2 Years Unlimited Mileage |
Cross References
This switch replaces or is equivalent to the following part numbers:
- Freightliner: FSC1749-2134, 1749-2134, 17492134
- Mack: 3014-17492134
- Automann: 577.46604
- Newstar: S-20678
- World American: WA06-0025
Applications
This low air pressure switch fits the following Freightliner models:
- Freightliner Century Class 112, 120
- Freightliner Columbia 112, 120
- Freightliner FLD112, FLD120
- Freightliner Coronado
- Mack and other Class 8 platforms with compatible air-brake cruise-kickoff circuit
For the 65-75 PSI low-air indicator switch (normally open), see Freightliner FSC1749-1907.
Verify your vehicle’s air system configuration and switch function (kickoff vs indicator) before ordering to confirm fitment.
