Description
229509-G – LIMITING/QUICK RELEASE VALVE (2)
PART NUMBER(S):
Fleet Products: 229509-G | OE: 229509, LQ-2 | Automann: E-BN229509X
DESCRIPTION:
Model: LQ-2 Limiting/Quick Release Valve
Vehicles: Suitable for heavy-duty truck and trailer applications
• Function: Limits front axle brake pressure by 50% on slippery roads; allows full brake pressure on dry roads
• Type: Dual-function valve – acts as both brake limiting and quick release valve
• Mounting Location: Front axle (pre-FMVSS-121 systems)
• Supply Port: 3/8" NPT
• Delivery Ports: 2 × 1/4" NPT
• Cut Out Port: 1/4" NPT
• Construction: OEM-grade durability
• Pressure Control: Automatic pressure modulation based on road surface conditions
• OEM Application: Specifically for front axle brake systems on pre-121 regulated vehicles
Applications:
Designed to optimize braking performance by reducing the chance of front-wheel lockup on slippery roads. Commonly used in legacy air brake configurations for commercial trucks manufactured before FMVSS-121 standards came into effect.
CROSS-REFERENCE(S):
229509, 229509-G, 229509X, 229509RX, KN229509, 229509BXW, 175229509, BW229509RX, E-BN229509X, OR229509, 225480, LQ-2
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:
✔ Mount on front axle only
✔ Automatically limits brake pressure to 50% in low-traction conditions
✔ No mounting bracket included – application-specific install
✔ Do not substitute for valves in FMVSS-121 compliant systems
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Warranty Information
