Specifications
Brake assessment manual Ver 1.0 Published October 2013 7 (48 pages)
Table 1 (continued)
Mod. Description
22 Wheels and tyres: A change in the diameter of the wheel and tyre combination in excess of
+/- 7% and which have not been previously tested.
23 Removal of any form of power assist or full power unit (whether by vacuum, air, or hydraulic
means) from an existing brake system that results in the driver supplying all the energy to
apply the brakes.
24 Removal or alteration to a motion sensitive brake system pressure differential valve.
25 Removal or alteration to a brake system load sensing or pressure regulating valve (brake
proportioning valve).
26 Alteration or modification to a diagonally split braking system using like parts designed for a
diagonally split braking system and remaining a diagonally split system.
Typical vehicles are Volvo, Lancia, and Ferrari.
27 Alteration or modification to a diagonally split braking system not using like parts designed
for a diagonally split braking system and converting it to a conventional front/rear dual circuit
braking system in the process.
28 Removal of a brake system pressure differential valve from a manufacturer’s standard and
unmodified braking system.
This modification can only be done if the vehicle is also modified to address the risk it
causes. It must not be done if a vehicle is otherwise unmodified.
29
Modification to the brake power unit of a hydraulic brake system which has been previously
tested and which incorporates pumps and accumulators also known as a full power braking
system.
Typical examples: Chevrolet/GMC and the like.
30 Modification or alteration to electro-hydraulic full power braking system.
31
Modification or alteration to regenerative brake systems.
The modification categories listed above are not exhaustive. Further categories may be
added over time.
Modifications not permitted
A vehicle’s hydraulic brake system that incorporates pumps and accumulators (also known as ‘full
power braking systems’) must not be modified.
Method 1 – Approved aftermarket components
A vehicle may be modified to incorporate aftermarket brake components, other than those
offered by the original vehicle manufacturer, without the need for testing providing:
• the make and model of vehicle in which the components may be installed is provided
by the components supplier;
• the component supplier has done the necessary tests to confirm the components
comply with the applicable standards and their compatibility with the nominated vehicle;
• all necessary instructions are provided at the point of supply by the components
supplier to ensure the components can be installed correctly in the vehicle make and
model;
• the instructions are in English and use SI Units, or for vehicles or components that use
Imperial Units or other units, the applicable units; and
• the modified vehicle is examined by a licensed certifier who –