Australian Design Rules & State Laws for Trailers

Vehicle Standards 2013
Australian Design Rule 38/04 – Trailer Brake Systems

This requirement started from 1st January 2015 for all vehicle models, whether new or existing.

In summary, the function of this vehicle standard is to specify requirements to ensure safe braking of trailers under both normal and emergency conditions.

The ADR for trailer brake systems was implemented to improve Australia's Road Safety Performance.

To view the ADR online, visit this link to the Federal Register of Legislation.

COMMON FACTS ABOUT TOWING WITH TRAILERS

Vehicle Category Codes:

CATEGORY CODEBRAKE CONTROL REQUIREDRECOMMENDED

TA (O1) - VERY LIGHT TRAILER

A single-axle trailer with a 'Gross Trailer Mass' (GTM) not exceeding 750kg.

NO Not Required

TB (O2) - LIGHT TRAILER

A trailer with a GTM not exceeding 3500kg, other than a trailer of Category TA.

YES

Brake Control RECOMMENDED: Time Based Braking System

Impulse Brake Control - Part No. 47235
Reliance Brake Control - Part No. 47285
Brake-Force Brake Control - Part No. 47225

TC (O3) - MEDIUM TRAILER

A trailer with a GTM exceeding 3500kg, but not exceeding 10,000kg.

YES

Brake Control RECOMMENDED: Proportional Braking System

InSight Brake Control - Part No. 47297
Agility Brake Control - Part No. 47294

TD (O4) - HEAVY TRAILER

A trailer with a GTM exceeding 10,000kg.

YES

Brake Control RECOMMENDED: Proportional Braking System

InSight Brake Control - Part No. 47297
Agility Brake Control - Part No. 47294

*GTM is the mass transmitted to the ground by the tyres of the trailer when coupled to a towing vehicle and carrying the maximum load recommended by the manufacturer or importer, approximately uniformly distributed over the load bearing area.

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