Description

Overview

The LQ-2 limiting quick release valve manages front axle air brakes on pre-121 vehicles by limiting service pressure and venting air quickly from the chambers. In slippery-road mode it cuts front axle pressure to help prevent wheel lock-up, while dry-road mode restores full application pressure for confident steering control.

Features

• Front axle limiting function that reduces service brake application pressure by 50% in slippery-road mode
• Integrated quick release function that exhausts air directly from the front axle brake chambers for faster release
• 3/8 NPT supply and delivery ports plus 1/4 NPT control port for straightforward plumbing on air brake systems
• Suited to pre-121 vehicles that use a TW-1 style dash valve so the driver can select limiting or normal operation

Specifications and Materials

Part number: AB8362P.

This limiting quick release valve follows the recognised LQ-2 pattern, with a 3/8 NPT supply port, two 3/8 NPT delivery ports and a 1/4 NPT control port that suit common front axle service brake layouts. Install it on the front axle or a nearby crossmember so air lines stay short, which improves response and release times. In a typical installation a TW-1 style cab control valve sends the control signal, so the driver selects 50% limiting in slippery conditions or full pressure in dry-road mode.

For a detailed description of operation, maintenance and internal layout, refer to the Bendix LQ-2 technical manual for this type of valve.

Compatibility and Fitment

This cross-reference listing means this valve is a suitable replacement for the part numbers and applications shown. Some changes in air line plumbing may be required. 29505, 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, 239659.

Compliance and Safety

When you install an LQ-2 limiting quick release valve, always isolate and drain the air system before you disconnect any lines. Then match each port to the correct supply, delivery and control lines as marked on the valve body. After installation, carry out a controlled brake test in a safe area to confirm that limiting and dry-road modes work as expected, that no leaks appear and that the front axle releases quickly and evenly on both sides. Regular checks of mounting fasteners, air lines and any signs of corrosion or impact damage help keep the valve performing reliably in service.

Trailer Applications

Workshops fit this limiting quick release valve to the steering axle of road tractors and rigid trucks that tow semi-trailers or full trailer combinations. It suits heavy transport fleets that want reduced front axle brake effort on low-friction surfaces while still keeping full pressure available on dry roads. In day-to-day fleet use it usually works with standard front service chambers and conventional drum brake hardware, giving a robust solution for mixed regional and highway work.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Why Choose ICS Trailers

ICS Trailers focuses on heavy vehicle trailer parts that handle Australian conditions, so you can match valves like this LQ-2 limiting quick release valve to your air brake system with confidence. Clear technical specifications, cross-reference data and structured descriptions help you confirm compatibility before you order. If you run a mixed fleet of pre-121 vehicles, this detail saves workshop time and keeps equipment on the road rather than parked in the yard.

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