Table of Contents
Advertisement
3.
Introduction
The simulation device "Brake Test Unit" (hereinafter referred to as BTU) has been developed
for testing the brakes of trailers with pneumatic braking systems. The BTU is coupled into the
pneumatic brake line between the tractor and trailer. The desired brake pressure for the towed
vehicle can be set and controlled electronically using BTU, independent of the tractor.
The BTU is used by experts, inspectors and other specialists entrusted with the inspection of
vehicle brakes to assess the vehicle brake in dynamic road tests.
In accordance with the regulations listed below, BTU allows the control of
the service brake system in the towed vehicle during the practical brake
test.
Caution
- In particular ECE Regulation No. 13; Supplement 13 to the 11 series of
amendments - Date of entry into force: 8 October 2015.
Annex 4 - Brake tests and performance of braking systems -> 1.4.4. type 0 test
for motor vehicles of category O with compressed air braking systems
- Or with reference to DELEGATED REGULATION (EU) 2015/68 of 15 October
2014 Annex II - Requirements for the testing and performance of braking
systems and trailer braking coupling and vehicles equipped therewith -> 2.2.3.
type 0 test for vehicles of categories R and S
Due to the defined test procedure (generation of the braking effect now by
the towed vehicle), driving situations can arise which can usually only be
mastered by trained and experienced test drivers. In addition, the BTU can
only be used for test drives on a specially designed and secured test site.
Danger
In order to avoid critical driving situations, the default values for the controlled brake pressures,
especially with regard to road conditions, load condition, etc., should always be increased in
small steps from the lowest pressure value.
High brake pressures can cause the wheels of the vehicle to lock. This can result in
uncontrolled driving behavior.
For this reason, the brake test by means of BTU is only permissible for "straight" driving and
"stretched" complete vehicle.
The BTU may only be used in conjunction with technically perfect
vehicles. In particular, the overall functionality of the braking system and
the homogeneous and symmetrical development of the braking forces of
the vehicle must be tested and ensured before the BTU is used.
Danger
8
Advertisement
Table of Contents
