Description
KN30300-G - EMERGENCY RELAY VALVE (CHARGING TYPE)
PART NUMBER(S):
Fleet Products: KN30300-G | Replaces OE: Haldex: KN30300, KN30300N, KN30300X, N4301AA | Automann: 170.KN30300 | Euclid: EMDKN30300X | Freightliner: HDXKN30300 | Mack: 5396-KN30300 | Meritor: R955KN30300X
DESCRIPTION:
Model: Haldex Emergency Relay Valve - Charging Type
Vehicles: Pre-FMVSS 121 trailers, converter dollies, and exempt trailer brake configurations
• Valve Type: Charging-type emergency relay valve
• Supply Port: One 3/4" NPT connection with nipple
• Delivery Ports: Four 1/4" NPT connections
• Service/Emergency Inlet Port: One 1/4" NPT connection
• Auxiliary Reservoir Port: Plugged
• Crack Pressure: 3.0 PSI
• Cover: Rotatable
• Function: Charges the emergency line and controls trailer emergency brake application
Applications:
Designed for pre-FMVSS 121 trailers and converter dollies using charging-type emergency brake systems with separate spring brake control. It is typically replaced when emergency-line charging, brake delivery, pressure retention, or emergency application becomes delayed or unreliable.
CROSS-REFERENCE(S):
KN30300MID, MIDKN30300, ZZKN30300, ZZKN30300X, 170KN30300, E-MDKN30300X, KN30300M1D, 8235R955KN30300X, R955KN30300XRI, TDAR955KN30300X, 3217-KN30300, AVKN30300, GTA30300, 30400P, KN-30300
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 charging-type trailer emergency brake systems.
✔ Confirm the 3/4" supply, four 1/4" delivery, and 1/4" service/emergency connections.
✔ Keep the auxiliary reservoir port securely plugged when it is not used.
✔ Follow the approved trailer air-system diagram and verify the cover orientation.
✔ Charge and leak-test the system, then verify emergency-line charging and brake application.
Warranty Information
