Braking Systems for B-Doubles and Road Trains - Victoria

Service summary

You will be required to comply with one of the following Australian Design Rules if you manufacture a prime mover used in a B-double or a vehicle used in a road train:

  • Second edition ADR 35A
  • Third edition ADR 35.
If you operate a prime mover in a B-double that fulfils one of the following conditions, you must have also have an anti-lock braking system complying with third edition ADR 64:
  • built after 1989
  • first used in a B-double after 1993
  • is used in a B-double that includes a road tank vehicle carrying dangerous goods.
If you operate or modify a heavy trailer used in a B-double or road train, you must comply with ADR 38. Australian Design Rule 35 specifies the breaking requirements on commercial motor vehicles and larger passenger vehicles. Australian Design Rule 64 specifies additional design and construction requirements for hauling vehicles designed to be used in road trains and B-doubles. Australian Design Rule 38 specifies requirements for braking under both normal and emergency conditions for trailer brake systems.

Please consult the Contact Officer for more information and to ascertain the level of compliance that may be required.

Service type

Code of Practice

A code of practice can be either a legal requirement or non-legal requirement. Legal codes of practice are defined as a result of legislation. Non-legal codes of practice are defined by industry regulators and bodies.

Administering agency

National Heavy Vehicle Regulator

Act(s) name

Heavy Vehicle National Law Application Act 2013 (Victoria)

Regulation(s) name

Heavy Vehicle (General) National Regulation 2013 (Victoria)

Contact details

General Enquiries
National Heavy Vehicle Regulator

Mailing address:
PO BOX 492
Fortitude Valley, Queensland 4006
Queensland 7008


1300 696 487


07 3309 8777


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