Description

Overview

The relay valve 4.6 psi crack pressure model provides high-flow service brake control for heavy trailers and dollies. The relay valve 4.6 psi design moves air quickly from reservoirs to chambers and then exhausts rapidly, so brake application and release stay consistent. Consequently, fleets benefit from dependable timing across multi-axle configurations.

Features

• Single control circuit with fast response for stable service braking
• Crack pressure nominal 4.6 psi for predictable application timing
• Standardised pipe threads simplify replacement on existing plumbing
• Robust body suited to linehaul and vocational trailer duty

Specifications and Materials

Part number: AB8359.
Ports: supply 1/2″ pipe thread, delivery 3/8″ pipe thread, control 3/8″ pipe thread, nominal crack pressure 4.6 psi. For reference on relay valve function and selection, see the manufacturer technical guide

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.
KN28010, 809095, 9732980030, 9732980040, 9732980510, 9732980520, RKN28060, KN28060X, 065125, 065602, 102849, 103009, E8HS2A449A, 10130393, 1010430, 2415262, 2421922, 2421943, 2423281, 2446780, 2474539, 2474702, 2479263, 11665, N20829C, N20829L, N2531A, N30096E, N30096FA, N30096FB, 20QE1320, 9125, 401220, 51442, 51443, 767653010656, 25AA0630A, 492102C, 932022, RVO46, N300964F

Compliance and Safety

Install with clean, dry air lines and torque fittings to pneumatic standards. Afterwards, leak-test all joints and verify application and release times on level ground before returning the vehicle to service.

Trailer Applications

Use this relay valve 4.6 psi unit on trailers and dollies requiring single-line service control with 1/2″ supply and 3/8″ delivery and control ports. Additionally, it suits retrofits where equivalent crack pressure and porting are required to maintain system timing.

Cross-reference and Suitability

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

Why Choose ICS Trailers

ICS documents specs clearly, vets interchange data, and supports trade buyers with practical advice for Australian conditions. Browse Air Brake Parts at ICS Trailers