Description
Genuine Paccar OEM Q27-1038 normally-closed pressure switch for Peterbilt and Kenworth trucks, most commonly applied to the parking-brake circuit where the switch closes (completing the circuit) until system air pressure exceeds the release threshold. Replaces former Paccar service number 16-09155.
Signs You Need a New Pressure Switch
- Parking-brake or pressure warning light stays on with adequate system pressure
- Warning indicator fails to illuminate when pressure genuinely drops
- Intermittent or erratic pressure-warning signals
- Switch-controlled circuit (lamp, buzzer, valve) fails to actuate
- Visible corrosion or damage at the switch body or connector
Specifications
| Manufacturer | Paccar (Genuine OEM) |
|---|---|
| Part Number | Q27-1038 |
| Former Number | 16-09155 |
| Part Type | Pressure Switch – Normally Closed (N.C.) |
| Common Application | Parking-brake circuit |
| Condition | New |
Cross References
This switch replaces or is equivalent to the following part numbers:
- Paccar (former): 16-09155
Applications
This pressure switch is used on Paccar-platform Peterbilt and Kenworth trucks calling for Q27-1038, including:
- Peterbilt 365, 367, 379, 386, 389
- Peterbilt 384, 388, 567, 579, 587
- Kenworth T600, T660, T680, T800, T880
- Kenworth W900, W990
Confirm install location, activation-pressure spec, and connector type for your specific application before ordering — Q27-1038 is used in multiple circuits across model years.
