Description
RATIO RELAY VALVE (4-PORT, 4.5 PSI CRACK)
PART NUMBER(S):
Fleet Products: 110139-G (New) | OE: Sealco 110139, Meritor RSL110139, Haldex 110139X, Automann 170.110139
DESCRIPTION:
Model: Ratio Service Relay Valve – Non-ABS (RD045)
Vehicles: Trailer service brake systems – tandem axles (tank-mount preferred)
• Delivery Ports: (4) 3/8" NPT
• Control Port: 3/8" NPT
• Supply/Aux Port: 3/8" NPT
• Reservoir/Tank Port: 3/4" NPT
• Crack Pressure: 4.5 psi nominal
• Ratio Feature: 1:1 under normal stops; momentary 1:1.5 in hard stops (pre-lap)
• Material: Aluminum body
• Weight: ~5.1 lbs
• Mounting: Tank mount
• Tag/Spec: SAE J1860 RD045; Non-ABS four-port service valve
Applications:
Is this the right relay valve for your trailer? Yes—use it to control braking on tandem axles where a momentary 1:1.5 ratio improves brake force during hard stops before lap-off. Not intended for converter dollies, lift axles, or trailer turntable axles due to the ratio behavior.
CROSS-REFERENCE(S):
110139, 110139X, 110147, 110600, 110600X, 110126, 110143, 110583, 110005, 110118, 110673, 02-055, 032102, 032103, 10003890, 102616, 12343, 12345, 12900076, 13010046, 14406, 170.110139, 170110139, 170.110139P, 170.110139XB1, 2RSL110139, 322-GN110139, 39540263, 401132, 430-20094, 51444, 55110139, 680-110139, 680502105870, 802605, 8235RSL110139, A100042346, A103600, A86477, AM170110139, AMMTRRSL110139, AV110139, BBH110139, BWR110139, E-SL110139, ESL110139, E7HZ-2A016-A, GN110139, HYU10003890, LIK110139X, MID110139, MSV110139, M-110139, OE R6552, PF SEA110139, R6552, RORSL110139, RSL110139, SA110139, SC110139, SEA110139, SEA110139N, SEA-110139, SEO110139, SL110139, SRVVALVE, S-17736, S17736, TDARSL110139, TR110139, TV110139, WWS110139, 20SC110139, RD045
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Use on trailers controlling two axles; do not use on converter dollies, lift axles, or trailer turntable axles
✔ Verify port sizes (3/8" delivery/control/supply; 3/4" reservoir) and 4.5 psi crack pressure match your system
✔ Mount to tank per OEM practice; torque fittings to spec and leak-test after install
✔ Ratio feature will momentarily increase control-to-delivery from 1:1 to 1:1.5 during hard stops—this is normal behavior
✔ For service, use plug unit 110143 and repair kit RSL110118 where applicable
SOLD AS NEW
Brand new and ready to install, with OEM Grade Reliability
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, Call: 1-877-243-0442 | Email: sales@fleet-products.com
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
