Description

Overview

The Relay Valve Parking Air Reservoir Control manages spring brake circuits on heavy trailers, and it does so with fast, consistent response. Because it mounts to the reservoir and uses the prime mover supply line, it suits multi-axle layouts where reliable park and emergency performance matters.

Features

• Anti-compound function that prevents simultaneous service and emergency application
• Interchangeable with CA48 for straightforward fleet maintenance
• Colour-coded top for quick identification during service
• Suited to single or multi-axle configurations

Specifications and Materials

Part number: A88332.

For regulatory context on heavy trailer brake systems, review the Australian government’s ADR 38 trailer brake standard.

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.
CA400, WCA400, AB8472, CA48

Compliance and Safety

Install the valve with clean, thread-sealed fittings, then torque to specification. Next, pressure-test the circuit, confirm correct modulation, and verify both park and emergency functions against ADR test procedures. Finally, recheck for leaks after the first road test.

Trailer Applications

Use this P.A.R.C relay valve on semi-trailers and dollies with multiple spring brake chambers. Consequently, multi-axle groups gain balanced release and apply times, while workshops benefit from predictable serviceability and consistent parts selection.

Cross-reference and Suitability

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

Why Choose ICS Trailers

We source proven air brake components and, moreover, publish clear specifications so you can select with confidence. Our technical team supports fleets and repairers with dependable advice and competitive pricing. To continue your search, visit our Air Brake Parts category.