Description

Overview

The relay valve horizontal delivery ports design improves brake response on long wheelbase trailers by relaying control air close to the axle group. This relay valve speeds apply and release, reduces line losses, and helps keep pedal feel consistent under load. As a result, workshops can simplify hose routing while maintaining dependable braking performance.

Features

• Horizontal delivery ports to tidy plumbing on trailer frames
• High-capacity relay action for fast, repeatable response
• 4 psi crack pressure for predictable modulation under varying loads
• NPT porting matched to common Australian heavy-trailer systems

Specifications and Materials

Model: Suits R-14H with horizontal delivery ports.
Supply port: 3/4″ NPT.
Delivery ports: 1/2″ NPT (2).
Service (control) port: 1/4″ NPT.
Balance port: 1/8″ NPT.
Crack pressure: 4 psi.
Part number: AB8381P.
For component family reference and functional detail, see the Bendix R-14 relay valve overview Bendix R-14 relay valve overview

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.
103010, 102998, 103125, 103125X, 102855, 103066, 102858, 103024, 103112, 103230, 104146, 108500, 109788, 10130595, 5311924, 5311924000, KN28071, KN28140, 763355, 445401630A, 20QE460, 15503793, 15535017, 1677540C91, R955103010, 1349880, P103480, 5004B5, 17340001, K295263R, S8255, 401169, 14018, 29762, 1092930, 722010027, 61170189, R14H, ABC106834, AB8373, SR-3, C51738, 101113, 272914, 5006256, 5005810

Compliance and Safety

Install per manufacturer practice, torque pneumatic fittings correctly, and leak-test the system. Then confirm service and parking brake performance against workshop standards and applicable roadworthiness checks before releasing the vehicle.

Trailer Applications

Use this relay valve on heavy trailers where a frame-mounted unit with horizontal outlets shortens lines to service chambers. It is typically mounted near the axle group to minimise delay and reduce hose strain.

Cross-reference and Suitability

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

Why Choose ICS Trailers

We focus on straight specs, usable interchange data, and practical guidance so workshops can complete repairs with confidence. Browse Air Brake Parts at ICS Trailers