Description

Overview

The Pacific R-14H relay valve is built to control trailer service and spring brakes accurately on long wheelbase Kenworth combinations. It helps shorten response time to the rear axles and supports balanced braking across multiple axle groups. As a result, fleets can maintain consistent brake feel while keeping air system layout practical.

Features

• Integral double check and balance port arrangement to manage service and spring brake signals efficiently.
• Horizontal delivery port layout that suits common Kenworth and similar trailer plumbing configurations.
• High capacity valve body that handles repeated heavy service applications in demanding linehaul use.
• Service, supply and balance ports sized for standard heavy vehicle air brake plumbing and fittings.

Specifications and Materials

This R-14H style relay valve uses 3/4″ NPT supply ports, 1/2″ NPT delivery ports, a 1/4″ NPT service port and a 1/8″ NPT balance port, following common heavy trailer layouts. The housing is a robust cast body suitable for road transport brake systems and typical Australian operating conditions. Crack pressure is set at approximately 5.5 psi so the valve responds promptly without brake drag. Part number: AB8396P.

For a general explanation of how air brake relay valves interact with heavy vehicle brake systems, see this air brake relay valve systems overview

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. 103294, 103292, 103292X, 104587, 104587X, 106159, 106159X, 106165, 106165X, 106325, 106325X, 108037, 108037X, 6995784, 103294B1, 6994784, 802092, 802408, 402658, SA561, 3918399, R14H.

Compliance and Safety

The Pacific R-14H relay valve fits into standard heavy vehicle air brake circuits that follow recognised industry practice for dual circuit service and spring brake systems. Installers should always follow the vehicle manufacturer brake drawings, and they should confirm supply, delivery, balance and service lines before tightening fittings. After installation, technicians must leak test, verify crack pressure performance and carry out a full brake function check before the trailer returns to service.

Trailer Applications

This R-14H relay valve pattern commonly appears on long wheelbase trailers, dollies and semi-trailers where rear service chambers need faster response. It can also suit combinations where spring brake control needs an integrated balance port and double check function. In addition, it is suitable for many Kenworth trailer applications that specify an R-14H horizontal delivery layout when matched to the correct plumbing.

Cross-reference and Suitability

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

These cross-reference numbers help match existing fleet part records and previous fitments to a current Pacific R-14H relay valve option without guessing.

Why Choose ICS Trailers

ICS Trailers focuses on stocking proven air brake components that match common Australian trailer and Kenworth applications. Each part is selected to help workshops reduce downtime and keep combinations compliant with roadworthiness requirements. For more compatible valves and fittings, you can browse Air Brake Parts at ICS Trailers