Description
KN26020 RT-4 TRAILER SPRING BRAKE CONTROL VALVE
PART NUMBER(S):
Fleet Products: KN26020, KN26020-G
OE: N4305A, KN26020X
Automann: 170.KN26020
DESCRIPTION:
Model: RT-4 Trailer Spring Brake Control Valve
Vehicles: Universal for heavy-duty trailer air brake systems
• Function: Multi-function control valve for trailer parking and emergency brake systems
• Actuation Type: Pneumatic (air-operated)
• Supply Ports: Trailer Supply A – Plugged, Trailer Supply B – 3/8" NPT
• Control Port: 3/8" NPT
• Reservoir Ports: A – 1/2" NPT, B – 3/8" NPT
• Delivery Ports: (4) 3/8" NPT
• Closing Pressure: 70 PSI
• Material: Engineering Grade Composite (EGC) for high impact, chemical, and corrosion resistance
• Approx. Weight: 4.5 lbs
• Compliance: Meets FMVSS-121 spring brake system requirements (Oct 1992 – present)
• Unique Features:
– Integral exhaust cover for environmental protection
– Integrated filters reduce contamination
– Anti-compounding feature prevents simultaneous application of service and spring brakes
– Interchangeable with other industry RT-4 valves
– Internal pressure protection prevents spring brake activation during reservoir fill
• System Fitment:
– Designed specifically for use on trailers equipped with spring brake systems
– Handles both emergency and parking brake functions
– Provides automatic spring brake application upon loss of trailer supply line pressure
Applications:
The KN26020 RT-4 valve is engineered for use on trailers to manage air spring brake control. It ensures proper charging of the reservoir, applies spring brakes upon supply loss, and meets all FMVSS-121 safety standards post-1992. A direct fit for most trailer configurations requiring a spring brake relay valve with integrated safety functions.
CROSS-REFERENCE(S):
KN26020, KN26020-G, KN26020X, RKN26020, N4305A, KN26000, KN26010, GN26020, N4302A, N4305D, N4305C, 1191982, 110170X, 110171X, 110180N, 110190N, 110190X, 110315X, 12360, 5396-KN26020, 110147, 110171, 110190, 110180, A83335, A83336, A88802, A88812, AV26020, SA530, 767653010540, PP01295, S-A530, 279180X, 279952X, 280375X, 110415X, 110360X, 110380X, 110410X, 102165X, 102626X, 110139X, KN28061X, 103028X, 103833X, 110412X, 110416X, 9125X, KN28132X, KN28140X, ETP-KN26020, 170.KN26020A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Designed for trailer mounting only—confirm reservoir and supply port orientation
✔ Ensure supply and delivery port threading is clean and dry before installation
✔ Always test valve function during pre-trip inspection; improper installation may result in trailer brake failure
✔ Consult Haldex RT-4 valve manual for advanced service diagnostics or replacement intervals
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
