Description
Replacement parking brake low-pressure switch for Mack and Volvo trucks (OEM 20489116). The 2-pin circular-connector switch trips between 12 and 25 PSI to drive the dash parking-brake warning lamp and the related ECU strategy when air pressure is low — a common service item on Mack/Volvo air systems. PAI Industries 854032 is the verified aftermarket equivalent and fits the same multi-application footprint.
Signs You Need a New Parking Brake Pressure Switch
- Parking brake warning lamp stays on with full system air pressure
- Lamp fails to illuminate at low air pressure or during start-up
- Intermittent parking-brake fault codes (Mack/Volvo PB pressure)
- Visible damage, corrosion, or air leak at the switch body
Specifications
| Manufacturer | PAI Industries (replaces Mack/Volvo OEM) |
|---|---|
| Part Number | 854032 |
| Part Type | Parking brake low-pressure switch |
| Activation Pressure | 12–25 PSI |
| Connector | Circular, 2-pin |
| Overall Length | 2.43 in |
| Color / Finish | Black / silver |
Cross References
This part replaces or is equivalent to the following part numbers:
- Mack: 20489116
- Volvo: 20489116
- PAI Industries: 854032
Applications
Used across Mack and Volvo on-highway truck platforms equipped with the 20489116 air-system pressure switch, including:
- Mack Anthem, Pinnacle, Granite, CHU, CXU, GU series
- Volvo VNL, VNR, VNX, VHD with D11/D13 platforms
Confirm the existing OEM number reads 20489116 and the connector matches a 2-pin circular plug before ordering. Note: Mack/Volvo air-system switches use several similar housings — match by part number, not appearance.
