Specifications
Brake assessment manual Ver 1.0 Published October 2013 39 (48 pages)
Test E: Booster failure
[Based on: ADR 31/00, Clause 31.3.2, Item 9 and Clause 31.5.9.]
Test E is required to ensure that the vehicle can be safely brought to rest in the event that
the booster fails.
For vehicles subject to Modification 19, this test must be done at 55 km/h; for all other
vehicles, the test must be done at 80 km/h. In all cases, the vehicle must be in the MLTM
condition and the gears in the ‘drive’ position. The vehicle must meet one of the following:
Condition D1 It must attain a minimum Average Deceleration of 2.55 m/s
2
for one
deceleration mode within a maximum of four deceleration modes when any one Brake Power
Assist Unit or Brake Power Unit is inoperative and depleted of all reserve capability. One
single failure must be induced prior to each set of deceleration modes and the vehicle
restored at the completion of the set.
Condition D2 If fitted with one or more Brake Power Assist Units, with any one Brake Power
Assist Unit inoperative, the Average Decelerations set out in Table D must be attained on the
first six consecutive stops with the inoperative unit not initially depleted of reserve capability,
and the Average Deceleration specified for the final seventh stop is attained with the
inoperative unit depleted of reserve capability.
Condition D3 If fitted with a Brake Power Unit incorporating an accumulator-type reserve
system, with any one Brake Power Unit inoperative the following Average Decelerations set
out in Table D must be attained on the first ten consecutive stops with the inoperative unit not
initially depleted of reserve capability, and the Average Deceleration specified for the final
eleventh stop is attained with the inoperative unit depleted of reserve capability.
Condition D4 If fitted with a Brake Power Unit incorporating a backup type system, with any
one Brake Power Unit inoperative the Average Deceleration set out in Table D must be
attained for each of the 15 consecutive stops.
TABLE D: AVERAGE DECELERATIONS FOR VEHICLES IN MS/
2
Condition
Number
D2 D3 D4
1 4.85 4.85
2 3.65 3.95
3 3.00 3.65
4 2.70 3.35
5 2.40 3.00
6 2.25 2.85
7 2.00 2.70
8 2.55
9 2.40
10 2.25
11 2.10
12
13
14
15
Not less than 3.65