800257 MV-3 Dash Air Brake Control Valve for Bendix Freightliner Peterbilt Keene

This MV-3 Dash Air Brake Control Valve is a dash-mounted pneumatic push-pull valve compatible with Bendix systems on Freightliner, Peterbilt, and Keene trucks, and matches OEM Part# 800257.

Product Overview

The MV-3 Dash Air Brake Control Valve controls parking brake and trailer air supply functions from a single compact module. Built to replace worn or sticky valves in heavy-duty air brake systems, the 800257 MV-3 valve restores dependable push‑pull actuation for safe vehicle operation. Fleet maintenance crews and owner‑operators rely on the MV-3 Dash Air Brake Control Valve for predictable performance in daily commercial service.

Key Features & Performance

• Self‑cleaning valve spool design resists sticking from moisture and debris
• Zinc die‑cast body with corrosion‑resistant finish withstands road salt and chemicals
• Ergonomic push‑pull knobs with clearly marked positions for intuitive control
• Internal check valves prevent unintended air bleed during parking brake apply/release
• Pre‑clocked mounting flange and matched port thread for straightforward dash panel retrofit

Fitment & Compatibility

• Freightliner trucks with Bendix air brake systems
• Peterbilt trucks with Bendix air brake systems
• Keene trucks with Bendix air brake systems
• Additional commercial vehicles using Bendix MV‑3 dash valve assemblies

Common Uses

• Replacement of faded or leaking original MV‑3 valve on Class 7‑8 trucks
• Dash‑panel rebuilds during full air system overhaul
• Restoring trailer air supply control for combination vehicle operation
• Preventive maintenance swaps on high‑mileage vocational trucks

Technical Specifications

• Part Number(s): 800257
• Valve Type: MV‑3 Dash Air Brake Control Valve
• Port Size: 1/4″ NPT supply and delivery
• Knob Configuration: Yellow Park / Red Trailer Supply
• Operating Pressure Range: 0‑150 PSI

Frequently Asked Questions

Q: Does this valve include mounting hardware? A: The unit ships with the standard mounting studs and gasket; reuse your original dash bezel and screws for a complete install.

Q: Can I use this MV‑3 valve on a truck without an air dryer? A: Yes, the self‑cleaning spool is designed to operate in systems with or without air dryers, but routine reservoir draining is still recommended to prolong valve life.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.