Specifications

Brake assessment manual Ver 1.0 Published October 2013 38 (48 pages)
Tests D, F & G: Partial failure test front and rear; proportional valve failure;
and ABS failure
[Based on: ADR 31/00, Clause 31.3.2, Item 8 and Clause 31.5.8.]
Test D checks the master cylinder in a Split Service Brake System has enough displacement
to operate an individual circuit in the event of one of the circuits failing. Clamping off a brake
hose does not simulate a failure in one circuit.
Tests F and G are required to ensure that the vehicle can be safely brought to rest in the
event that the ABS fails.
The vehicle shall be tested in both the MLTM and LLTM condition at a test speed of 55 km/h
for vehicles subject to Modification 19, and 80 km/h for all other vehicles, with the gear
selected in the ‘Drive’ position. It must obtain a minimum Average Deceleration of 2.55 m/s
2
.
In the case of a vehicle having a Split Service Brake System a minimum Average
Deceleration of 2.55 m/s
2
must be obtained by operation of the service brake Control on at
least one deceleration mode within a number of deceleration modes which must not exceed
four for each single type of potential failure, including:
• failure of each sub-system of the split system
• inoperative Antilock System; and
• inoperative Variable Proportioning Brake System if fitted.
In addition, one single failure must be induced prior to each set of deceleration modes and
the vehicle restored at the completion of the set.
In the case of a vehicle not having a Split Service Brake System a minimum Average
Deceleration of 2.55 m/s
2
must be obtained by operation of the service brake Control on
each of 10 consecutive stops for each single type of potential failure, including:
• rupture or leakage of any component of the brake system other than a structural failure of
a housing that is common to two or more sub-systems
• inoperative Antilock System
• inoperative Variable Proportioning Brake System.
In addition, one single failure must be induced prior to each set of deceleration modes and
the vehicle restored at the completion of the set.
In the case of a vehicle not having a Split Service Brake System but having a service brake
system using Stored Energy the pressure and volume of the working fluid in the brake
system (including any energy storage devices) must not exceed the minimum levels
specified by the vehicle Manufacture’ or achievable by adjustment of Control s accessible to
the driver for initiation of the failure mode prior to the commencement of any partial failure
test sequence.