Description
KN28600-G - FF-2 STYLE RELAY VALVE
PART NUMBER(S):
Fleet Products: KN28600-G | Replaces OE: Haldex / Midland: KN28600, N4304AC, N4304, N4304AG, N4304AK, N4304BA | Automann: 170.KN28600 | Euclid: E-MDKN28600X, EMDKN28600X | Mack: 5396-KN28600
DESCRIPTION:
Model: FF-2 Full-Function Trailer Relay Valve
Vehicles: Single- and tandem-axle trailers with single or dual air reservoirs
• Crack Pressure: 3.0 PSI
• Supply Port: One 3/8" NPT
• Reservoir Port: One 3/4" NPT
• Control Port: One 1/4" NPT
• Delivery Ports: Four 3/8" NPT
• Spring Brake Ports: Two 3/8" NPT
• Mounting: Horizontal installation using a pipe-thread nipple
• Integrated Functions: Pressure protection, dual one-way check valves, spring brake quick release, and four-port service relay
• Anti-Compounding: Prevents simultaneous service and spring brake application
• System Configuration: Supports single- or dual-reservoir trailer systems
• Retrofit Use: Replaces compatible multi-valve trailer brake arrangements
Applications:
Designed for single- and tandem-axle trailer air brake systems requiring integrated service relay, spring brake release, pressure protection, and anti-compounding functions. It is typically replaced when brake application or release becomes delayed, air leakage develops, or an older multi-valve system is converted to an FF-2 configuration.
CROSS-REFERENCE(S):
BXKN28600X, BARKN28600X, EMDKN28600X, MIDKN28600, HDX KN28600, 300479CC, S8664, 12352, PL-28600, RB-28600, 110742, 110744, 401221, 39300584
A cross-reference listing means this part may be a suitable replacement for the listed part numbers. Always verify fitment before installation.
IMPORTANT INSTALLATION NOTES:
✔ Mount the valve horizontally using the correct pipe-thread nipple.
✔ Confirm the 3/4" reservoir, 3/8" supply, 1/4" control, four 3/8" delivery, and two 3/8" spring brake connections.
✔ Follow the approved FF-2 plumbing diagram when replacing a multi-valve system.
✔ Verify service brake priority, spring brake release, and anti-compounding operation after installation.
✔ Leak-test all connections and confirm reservoir compatibility before returning the trailer to service.
Warranty Information
