DUMP VALVES
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Hadley 1/4" Push Connect Pressure Dump Valve | H01501PUD
Brand:
Hadley
SKU:
H01501PUD
Price:
$120.26
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Dump Valves For Peterbilt Trucks
Dump valves — also called exhaust valves or air dump valves — are used in air suspension systems to rapidly exhaust air from suspension air bags, lowering the truck body or trailer to a desired ride height or for trailer coupling and dock leveling. On Peterbilt trucks with air-ride suspensions, dump valves are a key part of the height control and suspension management system, and a failed or leaking dump valve can cause ride height issues, uneven load distribution, or continuous air loss from the suspension system.
Frequently asked questions about dump valves
How do I know if my air suspension dump valve is failing?
Signs of a failing dump valve include the truck riding lower than normal on one or more corners, audible air leaks at the suspension valve assembly, the truck failing to return to correct ride height after a dump cycle, or abnormally fast air bag deflation. A stuck-open dump valve will continuously exhaust air from the suspension system, which can cause the truck to drop onto the bump stops and trigger low air pressure warnings. Identifying whether the issue is the dump valve itself or the height control valve requires isolating the components during a diagnostic air leak test.
Are dump valves and height control valves the same thing?
No — they work together but serve different functions. A height control valve continuously monitors and adjusts air bag pressure to maintain a set ride height as load changes. A dump valve is a discrete on/off valve that, when activated (usually by a dash-mounted switch or lever), rapidly exhausts air from the air bags to lower the suspension. Some systems integrate both functions into a single valve assembly, while others use separate components. When diagnosing suspension height issues, it's important to test each component separately to pinpoint the failure.
What air pressure and fitting specifications should I check when replacing a dump valve?
When replacing a dump valve, confirm the valve's pressure rating matches your suspension system's operating pressure (typically 100–120 PSI on most air-ride Peterbilt configurations) and that the inlet and outlet port sizes match your existing air line fittings — commonly 3/8" or 1/2" NPT or push-to-connect. Also verify the valve's actuation method (manual lever, push-button, or air-piloted) matches your cab control setup. Using an incorrectly rated or mismatched valve can result in improper suspension operation or premature valve failure.