Description

Overview

The R-6 relay valve controls service and parking brake pressure on heavy trailer and dolly axles in long wheelbase air brake systems. As a result, it relays foot valve input quickly to the rear brake chambers so the vehicle stops evenly. Additionally, the R-6 relay valve helps maintain low brake lag on multi axle combinations where long pipe runs can slow response.

Features

Moreover, key features of this relay valve support reliable trailer braking and easy service.

• Fast relay of service brake pressure to rear axle brake chambers.
• Graduating design that applies, holds, and releases air pressure in response to foot valve signals.
• 2 psi crack pressure for quick initial brake response on loaded and empty trailers.
• Compact body layout that suits mounting close to the axle group on long wheelbase vehicles.

Specifications and Materials

Firstly, this R-6 relay valve configuration uses a 180 degree service port layout so you can keep pipe runs balanced on each side. Secondly, supply and delivery ports are 3/8″ NPT, with four delivery outlets available for dual or tri axle groups. In addition, the control port uses a 1/4″ NPT thread and the valve opens at a 2 psi crack pressure to start brake application. Part number: AB8469P. Technical background on road vehicle air brake systems is available in this air brake systems overview from an independent reference.

Compatibility and Fitment

Specifically, 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. 279952, 279180, 279180X, 279730, 279730X, 279952R, D2X2654, M1567183, 7926000493, A103600, 279952B1, SA147, 936001005, 9006449, 177141, 034021, R6

Compliance and Safety

Correct relay valve operation is critical for meeting heavy vehicle brake balance and timing requirements on public roads. Consequently, this R-6 relay valve should only be installed and tested by qualified brake technicians who can verify leak tightness and response. In addition, you should always follow current workshop procedures and local regulations when replacing service brake valves on trailers.

Trailer Applications

In trailer applications, the R-6 relay valve typically mounts near the rear axle group so it can feed short delivery lines to each brake chamber. For example, it suits semi trailers, converter dollies, and dog trailers that use dual or tri axle brake layouts. Moreover, you can pair this valve with appropriate foot valves, reservoirs, and trailer spring brake valves to complete the air circuit.

Cross-reference and Suitability

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

Therefore, use this list to confirm matching numbers when you replace older relay valves in mixed fleets.

Why Choose ICS Trailers

ICS Trailers focuses on stocking proven air brake components so fleet operators can keep trailers working with minimal downtime. Furthermore, the team can help match an R-6 relay valve to your brake layout and advise on related fittings or accessories. Finally, buying through a specialist trailer parts supplier means you gain practical support together with competitive pricing for ongoing maintenance. Browse Air Brake Parts at ICS Trailers