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- Spring brake priority systems were approved with the FMVSS 121 rule in October 1992 & are the most common systems on tandem & tridem trailers with spring brake chambers. The valve immediately provides tractor supply air to release the spring brakes & the internal Pressure Protection Valve opens to also fill the air reservoir at approximately 80 psi.
- Four horizontal delivery ports available, 2 forward facing & 2 side facing.
- Designed for use with 2,800 cu in jumbo &/or 1,400 cu in air reservoirs.
- Complies with all regulations of FMVSS 121 & CMVSS 121
- Dimensions: Height 3.05” – Width 2.56” – Length 3.71” – Weight: 1.36 lbs.
- Mounting Hardware – See Air Valves & Related Products / Mounting Hardware
- Air Piping Diagrams – See Technical / Air Piping Diagrams, multiple diagrams are applicable.
- PLUG UNIT ASSEMBLY 110515 for pressure protection portion repairs, yellow shaded area
- PLUG UNIT ASSEMBLY 110520 for moveable seat portion repairs, blue shaded area
- MAJOR REPAIR KIT 110501
