Description
World American WA802122 is an aftermarket MV-3 dash control valve replacing Bendix 802122 in Class 6–8 air-brake systems. The valve combines tractor parking, trailer supply / emergency, and tractor protection functions into a single dash-mounted module with two yellow / red push-pull buttons. Ports: two 3/8″ push-to-connect supply, two 3/8″ PTC delivery, and one 1/2″ PTC exhaust — all with quick-connect color-coded fittings for clean installation.
Signs You Need a New MV-3 Dash Valve
- Continuous air leak or hissing from dash valve
- Yellow or red parking-brake button will not stay seated
- Button pops out below normal trip pressure
- Trailer brakes will not release or remain applied
- Tractor protection function not engaging at low pressure
Specifications
| Manufacturer | World American |
|---|---|
| Part Number | WA802122 |
| Part Type | MV-3 Dash Control Valve (trailer parking + tractor protection) |
| Supply Ports | (2) 3/8″ Push-to-Connect |
| Delivery Ports | (2) 3/8″ Push-to-Connect |
| Exhaust Port | 1/2″ Push-to-Connect |
| Mounting Holes | (4) 0.28″ through-holes |
| Tractor Trip Pressure | 20–35 PSI |
| Trailer Trip Pressure | 20–45 PSI |
| Buttons Included | Yes — yellow (tractor park) and red (trailer supply) |
Cross References
This part replaces or is equivalent to the following part numbers:
- Bendix: 802122, 802122BXW, BW802122
- Mack: 745-802122
- Velvac: VTC-38752
- Also known as: 060-802122, BEN-802122
Applications
This MV-3 dash valve fits Class 6–8 tractors and straight trucks using Bendix-style two-button dash air-brake control. Representative vehicles:
- Freightliner Cascadia, Columbia, Century, Coronado, M2, FLD
- Kenworth T680, T880, T800, W900, T660, T370
- Peterbilt 579, 389, 388, 387, 386, 379, 378, 367
- Volvo VNL, VNR, VNM, VHD
- Mack Anthem, Pinnacle, Granite, CXU, GU
- Western Star 4900, 5700, 4700
- International ProStar, LoneStar, LT, 9900, 9400
Verify port sizes (PTC vs. NPT) and mounting-hole pattern against your existing valve before ordering — MV-3 valves ship in multiple port and thread configurations.
