Description

Overview

The SR1 spring brake valve 55psi manages hold off and controlled application of spring brakes in dual or split heavy vehicle air brake systems. It suits tractors, trailers and dollies with spring brake actuators, and it helps keep parking and emergency braking predictable in daily freight work.

Features

• 55psi reservoir trip pressure that brings spring brakes in progressively as pressure falls
• Four 1/4″ NPT ports for supply, reservoir, delivery and control in a compact body
• Diaphragm protected exhaust that helps keep road dirt and spray away from internal parts
• Modulating action that lets drivers feather park brake applications instead of harsh on off behaviour

Specifications and Materials

The SR1 spring brake valve is built for dual circuit air systems where spring brakes need controlled release and reapplication. It mounts with the exhaust port facing down on a bracket or crossmember close to the primary reservoir so contamination drains away from the exhaust. The valve body uses clearly identified 1/4″ NPTF ports for supply, reservoir, control and delivery, plus sturdy mounting ears and a serviceable internal layout suited to heavy road transport. Part number: AB8354.
For more detail on operation, port layout and service procedures, review the manufacturer technical guide on SR1 type spring brake valves.

Compatibility and Fitment

This valve suits heavy trucks and trailers that use dual or split air systems with spring brake actuators and an SR1 style spring brake control circuit. It is usually installed near the primary reservoir and relay valves so service and park brake circuits stay short, responsive and easy to plumb during retrofits. 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. 286364, ABC286364, 459271C92, SR-1, 288063, S6701A.

Compliance and Safety

You must always isolate and drain the air system fully before removing or installing an SR1 spring brake valve, otherwise stored energy can cause sudden movement or component ejection. Follow the vehicle maker and valve technical guide for mounting position, line routing and torque values so the system keeps meeting heavy vehicle brake requirements. Regular leak checks at the exhaust port and around fittings, along with scheduled inspections of mounting hardware, help keep the valve working as intended over its service life.

Trailer Applications

Fleet operators use SR1 spring brake valves on prime movers, rigid trucks and converter dollies that run spring brake actuators on drive and trailer axles. In these applications the valve holds the spring brakes off while reservoir pressure stays above the trip point, then it modulates the spring brakes through the service brake valve if a supply circuit fails. As a result, drivers gain time to bring the combination to a controlled stop instead of a sudden lock up, which protects tyres, suspensions and freight.

Cross-reference and Suitability

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

Use these references to cross check existing catalogue numbers during changeover and confirm you are replacing the correct SR1 pattern valve.

Why Choose ICS Trailers

ICS Trailers focuses on proven heavy vehicle air brake parts, so you can match SR1 pattern spring brake valves with confidence and keep equipment earning on the road. The team understands fleet requirements for uptime and local support, and the catalogue groups related fittings, valves and brake hardware so sourcing stays straightforward. Browse more Air Brake Parts at ICS Trailers today.