Description

Overview

The SR3 trailer spring brake valve provides reliable control of trailer spring brakes on modern heavy vehicles. This SR3 trailer spring brake valve manages the parking and emergency functions of the trailer brake system so you can hold and release spring brakes consistently. It suits post July 1998 applications where ADR38/02 compliance is required on Australian trailers. Additionally, it offers an aftermarket alternative to common OEM trailer spring brake valves while maintaining predictable performance in daily use.

Features

• SR3 trailer spring brake valve function for parking and emergency trailer brakes
• Includes check valve ball in the mounting nipple for correct one-way protection
• Three 3/8 inch delivery ports to feed multiple spring brake chambers efficiently
• Compact, serviceable body suitable for retrofit into existing air brake layouts

Specifications and Materials

Part number: AB8373.
This SR3 trailer spring brake valve uses three 3/8 inch delivery ports and 1/4 inch trailer supply and service reserve ports, which suits many common trailer air brake layouts. The design is intended for use on trailers built after July 1998 and is described as ADR38/02 compliant when installed in a system that meets the standard. In addition, it comes with a check valve ball pre-fitted in the mounting nipple, which simplifies installation and helps maintain correct air system protection. For a general explanation of trailer spring brake valve principles and operation, refer to this manufacturer technical guide
This valve is typically installed close to the trailer air tank group, and it interfaces between the service control signal, the trailer supply, and the spring brake chambers. Exact body material and finish can vary by production batch, so you should visually confirm compatibility with the removed valve before final fitment.

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. 106834, 101113, 272914, ABC106834, SR-3, C51738, 5006256, 5005810, 108634, M305520, ABC3802, SR5
When you retrofit this SR3 trailer spring brake valve, you should always match port sizes and positions to the original valve and then confirm correct trailer parking and emergency operation during testing. Additionally, it is good practice to renew any damaged or worn air lines at the same time.

Compliance and Safety

This valve is described as suitable for use in post July 1998 trailer installations and is intended for ADR38/02 compliant braking systems when the full air brake design meets the standard. You must therefore ensure the rest of the trailer brake system is in sound condition and configured correctly. During installation, always depressurise the air system fully before removing the old valve, and then torque all fittings to the recommended values. Finally, carry out leak checks, function checks, and a road test to verify that the SR3 trailer spring brake valve applies and releases the spring brakes as expected.

Trailer Applications

The SR3 trailer spring brake valve is typically used on semi-trailers, tankers, and other heavy trailers that rely on spring brakes for parking and emergency functions. It can suit multi-axle trailer groups where several spring brake chambers must receive a consistent control signal. Moreover, it works with standard trailer supply and service lines, so it can integrate into many existing air brake designs with minimal changes. Fleet operators can therefore use this valve to maintain trailer uptime while keeping braking performance stable across different vehicles.

Cross-reference and Suitability

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

You should always compare the removed valve and these cross-referenced numbers with your existing installation before final selection.

Why Choose ICS Trailers

ICS Trailers focuses on heavy vehicle trailer parts, so you receive components that suit real-world Australian fleet conditions. In addition, our team can help you match this SR3 trailer spring brake valve to your existing system, which reduces downtime and rework. When you need reliable trailer air brake parts, you can confidently source them from ICS with the right technical information and support. Browse Air Brake Parts at ICS Trailers