229505-G | Limiting/quick Release Valve (LQ-2 Style)

229505-G – LIMITING/QUICK RELEASE VALVE

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PART NUMBER(S):
Fleet Products: 229505-G
OE: 229505, 278986, OR229505
Automann: –

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DESCRIPTION:

Model: LQ-2 Style Limiting/Quick Release Valve
Vehicles: Pre-FMVSS-121 trucks and trailers (pre-1985)
• Valve Type: Limiting and quick release combination
• Actuation: Pneumatic, automatic
• Function: Limits front axle brake application by 50% on slippery surfaces; allows full pressure on dry roads
• Additional Function: Serves as quick release valve for front axle service brakes
• Mounting: Front axle (typical), interchangeable with standard QRV
• Supply Port: 3/8" NPT
• Delivery Ports: 2 × 3/8" NPT
• Cut-Out (Control) Port: 1/4" NPT
• Exhaust Port: 3/8" NPT
• Mounting Hole Diameter: 19/32"
• Hole Spacing (Center-to-Center): 1-1/2"
• Performance: OEM-grade reliability, no electronics, mechanical modulation of brake pressure
• System Fitment: Installed in air brake systems on pre-1985 vehicles; used to reduce risk of front wheel lock-up during low traction conditions

Applications:
Designed for front axle air brake circuits on pre-FMVSS-121 vehicles. Used widely in legacy heavy-duty trucks and trailers for dual-function control—brake pressure limiting and quick release. Common in cold weather regions or fleets operating legacy equipment.

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CROSS-REFERENCE(S):

229505, BEN229505, 00716229505N, WA229505, EBN229505N, 278986, OR229505, 283525, 513947, 223821, 229505N, 4R9318, 6M4527, 2303058, 8A3141, 825494, 10130257, 10130386, 213326, KN32030, AE32589, 319051, K295-67, 745229505, 336751C91, 4002167R91, 625444C91, 19TN252, 1321081, 1361408, 21081, 724064, 724160, 801516, K29567, LQV-5697, 2396430, 20009, 13208E6516, 13220E1500, 034084, V1092935

A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.

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IMPORTANT INSTALLATION NOTES:

✔ Mount using 5/16" SAE Grade 5 bolts with torque: 17–19 ft-lb (23–26 N·m)
✔ Tubing must be cut squarely and connected without kinks; keep tolerance within 7° on perpendicularity
✔ Confirm axle-side application—only for front service brakes on non-ABS systems
✔ Do not use on FMVSS-121 compliant vehicles unless specifically approved

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