Description

Overview

This trailer emergency brake control valve gives positive manual control of park brake release on dollies and trailers. It follows the common Emergency Brake Release PUSH pattern with a dash-mounted knob that is easy for drivers to recognise. Common 1/4in NPT inlet, outlet and exhaust ports make it straightforward to integrate into existing trailer air brake plumbing. As a result, it suits fleet maintenance teams that need a reliable replacement for worn or leaking emergency release valves.

Features

Features of this emergency brake control valve focus on reliability, clear indication and simple installation for heavy trailer applications.

• Push knob marked Emergency Brake Release PUSH so operators understand the function at a glance.
• 1/4in NPT inlet, outlet and exhaust ports for simple plumbing on most dollies and converter trailers.
• Supplied with mounting screws, knob and name plate to minimise extra parts ordering and downtime.
• Compact metal body suited to crowded dash or control panel layouts on heavy vehicles.

Specifications and Materials

The valve uses a compact metal housing with threaded 1/4in NPT ports for inlet, outlet and exhaust, sized for standard trailer air systems. Internal components provide on-off control of air supply to the park brake circuit, so the valve suits emergency park release and hold functions rather than modulating service braking. Part number: AB8400. For a deeper explanation of how trailer control valves work in air brake systems, see this manufacturer technical guide from Bendix for further technical detail.

Compatibility and Fitment

This valve will normally replace existing Emergency Brake Release PUSH style hand valves that share the same port layout on dollies and trailers. 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. 17600B, N14488R, S-19331, SC17600B

Compliance and Safety

Trailer emergency brake control valve replacement should always follow workshop procedures and relevant heavy vehicle brake standards. Therefore installation and leak testing should be carried out by a qualified technician who understands tractor protection and emergency circuits. After fitting the valve, perform a full park and emergency brake function test before returning the trailer to service. Furthermore, regularly draining moisture from air tanks and inspecting hoses around the valve helps prevent contamination and unexpected failures.

Trailer Applications

This emergency brake control valve suits converter dollies, semi-trailers and road train equipment that use a dash-mounted park release control. Typically it sits within reach of the driver or operator so they can charge and release trailer spring brakes as required. In addition, its compact body allows retrofit into existing panels when upgrading from older or obsolete hardware.

Cross-reference and Suitability

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

Use these identifiers as a guide and always confirm port layout and mounting before ordering or installing a replacement valve.

Why Choose ICS Trailers

ICS Trailers focuses on stocking proven air brake components that match local heavy vehicle requirements and workshop expectations. Moreover, parts are selected to give dependable service life, clear information and straightforward installation in busy fleets. If you need guidance on pairing this emergency brake control valve with other valves, fittings or hoses, the ICS team can help match components to your trailer layout. Browse more options in the Air Brake Parts category at ICS Trailers to match complementary valves and fittings.