It is recommended that braking modifications are carried out using production components which themselves do not require modification.
Requirements for upgrading brakes
When brakes are upgraded using components or systems which were not standard options for the vehicle, a Statement of Requirements or a report from a MR426 Chartered professional engineers may be necessary.
When the brake system of an early model vehicle is modified, it is recommended that a dual or split circuit brake system be fitted.
If brakes are upgraded - eg front brakes changed from drum to disc, it is essential that:
- the correct master cylinder is fitted
- the brake master cylinder has adequate brake fluid in the reservoir (disc brake systems usually require a larger reservoir)
- front to rear brake balance is compatible and does not result in excessive wheel lockup of one axle during braking
- all components of the braking system are compatible and are unmodified
- the installation is in accordance with the manufacturer's specifications
- all brake tubing and flexible brake hoses must conform to Australian Design Rules.
Alterations to brakes
Brakes must not be altered in any way that would reduce braking efficiency. This includes fitting smaller drums or discs and machining drums or discs beyond the limits set by the component manufacturer.
All brake components shall clear other vehicle components such as wheels, suspension and steering components.
Brake components and brake lines must be mounted in areas where they are not likely to be struck by objects thrown up from the road. They also must be protected from excessive heat and abrasion. The use of copper tubing for hydraulic brake pipe is not allowed. Joining hydraulic brake pipes by brazing, silver soldering, etc is not allowed.
Brakes on light trailers
For information on the requirements for brakes on light trailers see the Vehicle Standards Fact Sheet MR25 Light vehicle towing trailer regulations (GVM 4.5 tonnes or less)