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Haldex · Air System
90555396.
In stock · ships from Knoxville
The Haldex 90555396 is a pressure protection valve that isolates the air brake circuit from the air suspension or accessory systems.
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Verified fitment for 9 applications
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All confirmed applications for this part number.
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Other applications
Dealer lists OEM # 90555399 as a possible cross‑reference, but this number could not be verified from the available catalog data. Applications are from published Mack listings; the valve may fit other heavy‑duty air brake systems.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 16 of 20.
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It automatically closes when pressure drops to 65 PSI, preserving enough air in the brake reservoirs for safe stopping. The valve has 1/4" NPT ports, opens at 70 PSI, and features a serviceable filter element. It is commonly used on heavy‑duty trucks and trailers, particularly certain Mack models, to replace a unit that no longer holds pressure or separates circuits properly.
Part Number: 90555396.
HALDEX PRESSURE PROTECTION VALVE 65PSI // OEM # 90555399
Dealer: KP Services Crossville
Compatibility, alternatives, and more
Parts commonly needed alongside air system
