Description
FF-2 STYLE RELAY VALVE – KN28600-G
PART NUMBER(S):
Fleet Products: KN28600-G | OE: KN28600, N4304AC | Automann: 170.KN28600
DESCRIPTION:
Model: FF-2 Full Function Trailer pneumatic Relay Valve
Vehicles: Compatible with single or tandem axle trailers with single or dual air tanks
• Crack Pressure: 3.0 PSI
• Supply Port: 3/8" NPT
• Reservoir Port: 3/4" NPT
• Control Port: 1/4" NPT
• Delivery Ports: 4 × 3/8" NPT
• Spring Brake Ports: 2 × 3/8" NPT
– Integrates pressure protection, dual one-way check valves, spring brake quick release, 4-port relay
– Anti-compounding function protects brake foundation
– Replaces older multi-valve systems
– Suitable for retrofit applications
Applications:
Designed for use in modern trailer air brake systems to replace older, multi-valve setups. Ideal for trailers with single or tandem axles requiring reliable, fast relay of brake signals and integrated spring brake and protection functions. Ensures optimal air system performance while simplifying plumbing and installation.
CROSS-REFERENCE(S):
KN28600, BXKN28600X, BARKN28600X, W:BWKN28600X, E-MDKN28600X, N4304AC, N4304AC, EMDKN28600X, MIDKN28600, HDX KN28600, 300479CC, N4304, N4304AG, N4304AK, N4304BA, S8664, 5396-KN28600, 12352, PL-28600, RB-28600, 110742, 110744, 401221, 39300584
A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Ensure horizontal mounting using included pipe thread nipple
✔ Match ports as follows: Reservoir – 3/4" NPT; Supply – 3/8" NPT; Control – 1/4" NPT; Delivery – 4 × 3/8" NPT; Spring Brake – 2 × 3/8" NPT
✔ Retrofit solution may require air line adjustments if replacing older valves
✔ Verify service brake priority and anti-compounding circuit integrity during install
✔ No special torque values published; use standard NPT sealing methods
✔ Ensure system compliance with FMVSS-121 upon completion
✔ Suitable for single or dual tank setups; use additional FF-2 units for triple axle trailers
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Warranty Information
