Description
FF-2 RELAY VALVE
PART NUMBER(S):
Fleet Products: KN28601, KN28601-G
OE: N4304AB, 28601, KN28601X, R955KN28601X
Automann: 170.KN28601
DESCRIPTION:
Model: FF-2 Full Function Relay Valve
Vehicles: Compatible with various heavy-duty truck and trailer applications
• Reservoir Port: 1/2" NPT
• Supply Port: 3/8" NPT
• Delivery Ports: 4x 3/8" NPT
• Control Port: 1/4" NPT
• Spring Brake Ports: 2x 3/8" NPT
• Crack Pressure: 3.0 PSI
• Actuation Type: Pneumatic (air-actuated)
• Body Material: Corrosion-resistant engineering-grade composite
• Mounting Style: Heavy-wall mounting nipple
• Weight: Approx. 3 lbs
• Single Valve System: Combines relay valve, spring brake valve w/ quick release, pressure protection, and two one-way check valves
• Brake Priority Logic: Ensures sufficient tank pressure before spring brake release
• Quick Release: Built-in for both service and spring brake
• Maintenance: Designed for easier install, service, and diagnostics
Applications:
Used in full-function air brake systems for tractors and trailers. Commonly applied in fleets requiring spring brake protection and anti-compounding functionality. Suitable for single or twin tank configurations. Designed to eliminate broken components caused by spring brake compounding.
CROSS-REFERENCE(S):
101993, 10810486, 110742, 110744, 1113099, 12352, 12352X, 1284972, 1321058, 1360242, 1360249, 1361679, 170229635, 17376004, 1802597, 20001P, 212655014, 217005018, 229635, 229635B1, 229635N, 229635P, 229635R, 229635RX, 229635S, 229635X, 2530004859416, 255004, 255005, 276566, 276566B1, 276566N, 276567, 28600, 28600P, 28600X, 28601, 28601P, 28601X, 287334, 300479CC, 3005453, 304AB, 3060509, 3060636, 3061136, 311698, 3116981, 3267700, 334152, 3507194, 3507376, 3919797, 39300584, 401221, 401221TRA, 40750, 40969, 416.00.3804.778, 416003804778, 4622767, 4820005222074, 5012701, 517429, 53101201, 5340259028, 538035, 5396-KN20001, 5396-KN28600, 5396-KN28601, 5396KN28601X, 550069, 619502C92, 640136, 655530, 70311698, 71230547, 745229635N, 745276566N, 767653010823, 77024-11, 770241, 770243, 770246, 79014056, 800952, 801175616, 801175617, 825638, 90000606, 90016369, 900219A, 921060, 98005606, 99410118, 99410120, 99410538, 99410818, 9990000094, A68365, ACA05765700, ACA06765700, ACE009754001, AE38210, AE770241, AE770243, AE770246, AKA5622, AV229635, AV28601, AVKN28601, AYD20791, BBH-229635CX, BBHRB276566, BBHRB28600, BEN229635N, BGIKN28601, BGKN28601X, BH229635, BVKN28601, BWKN28601X, C109501, DKN28601, EMDKN28601, EM40740, FTV4075, GTA28601, HAL-KN28601, HKN28600, IKN28601, K114111, K29571, KN28601, KN28601RX, KN28601X, LCV3691, MBRKN28601, MIKN28601, MIKN28601X, MSMDKN28601X, N4304A, N4304AB, PAFTV4075, PP03320, RB28600, RKN28601, S-22188, S22188, TRKN28601, TV28601, ZZKN28601
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 all ports are connected to the correct supply, reservoir, control, and delivery lines
✔ Tighten fittings per OE torque spec (not explicitly cited—refer to vehicle service manual)
✔ Use thread sealant compatible with air brake systems
✔ Inspect O-rings and mounting hardware before installation
✔ Mount vertically where possible to support drainage and optimal function
✔ Do not reuse damaged or contaminated fittings during install
WHY CHOOSE FLEET PRODUCTS | KBR - HEAVY DUTY TRUCK & TRAILER PARTS?
• Canadian-owned since 1985• Trusted by fleets, mechanics, and B2B partners across North America
• Fast, Reliable Shipping Across North America
• Competitive pricing with Core Return Refunds
• Price Match Guarantee | Find a better price? We'll beat the difference by 10%!
Warranty Information
