Description
KN30100-G - EMERGENCY RELAY VALVE (AIR HYDRAULIC)
PART NUMBER(S):
Fleet Products: KN30100-G | Replaces OE: Haldex: KN30100, KN30100X, N4301A | Meritor: R955KN30100X
DESCRIPTION:
Model: Haldex Air-Hydraulic Emergency Relay Valve
Vehicles: Pre-FMVSS 121 trailers, converter dollies, and exempt trailer brake configurations
• Valve Type: Air-hydraulic emergency relay valve with automatic bleed-down
• Service Inlet Port: One 1/4" NPT
• Emergency Inlet Port: One 1/4" NPT
• Delivery Ports: Four 1/4" NPT
• Main Reservoir Port: One 3/4" NPT
• Auxiliary Reservoir Port: One 3/8"-18 NPT, drilled and tapped on the valve bottom
• Crack Pressure: 3.0 PSI
• Cover: Rotatable
• Function: Controls emergency braking and automatically bleeds down system pressure
• System Restriction: Not designed to control spring brakes
Applications:
Designed for air-hydraulic emergency brake systems on pre-FMVSS 121 trailers, converter dollies, and exempt trailer configurations. It is typically replaced when emergency brake application, automatic pressure bleed-down, air delivery, or valve sealing becomes unreliable.
CROSS-REFERENCE(S):
AA1004AA, 530780, 3217-KN30100, MD KN30100, 279952-G, 279952B1, 279952R, ZZ279952, E-BN279952X, 0R279952, A103600, A103600X, A85490, A86477, A97600, 280856N, 51444, 279180, 279180X, 279730, 279730X, 34021, 102626, 110139, 110450, 110600, 177141, 401132, 9006449, 936001005, 7926000493, D2X2654, M1567183, S-A147, S-17740, SA147, WA279952, RG4, RS2, BA147GRP, RL3518ED03, VTC-147A, TKL279952, BW279952N, BDX279952, BEN279952, BW 279952, WM147P, WM147P-G, 111542, 8235R955KN30100X, KN30100M1D, MDKN30100X, TDAR955KN30100X, ZZKN30100, ZZKN30100X
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:
✔ Use only in approved air-hydraulic emergency brake systems; do not use for spring brake control.
✔ Confirm the two 1/4" inlet ports, four 1/4" delivery ports, 3/4" reservoir port, and 3/8"-18 auxiliary port.
✔ Connect all air lines according to the approved trailer brake-system diagram.
✔ Verify the automatic bleed-down function and keep unused reservoir connections properly sealed.
✔ Confirm bracket requirements, then charge and leak-test the system after installation.
Warranty Information
