Specifications

TEBS E2
4
GIO Functions
73
4.11 Brake lining wear indication (BVA)
Application
All trailer vehicles with disc brakes
Purpose
Wear indicators, a wire integrated into the brake lining, monitor the wear of both lin-
ings of a disc brake.
Function
Wear indicators can be connected on up to 6 brakes on the ECU. All wear indica-
tors are connected in series and are connected to the wear input. The supply volt-
age is 24 V.
1st warning level: At 95 % brake pad wear. A short-circuit occurs.
2nd warning level: If the wear indicator indicates that the wire is worn through for
the duration of at least 4 seconds (or longer),a voltage of 24 V will be measured at
the lining wear sensor and the warning will be activated. The warning lamp will
warn the driver if the end value for lining wear has been reached (100% brake pad
wear).
In the case of Power On (ignition switched on) the warning lamp lights up in 4 cy-
cles = 16 times.
The warning is interrupted when the vehicle's speed exceeds 7 km/h.
Replacing the wear indicators is automatically detected by the system when the lin-
ings are changed. Both warning levels are deactivated after 8 seconds.
The wear information is ascertained from the TCE in systems with TCE. It is the
TEBS E that warns the driver or triggers the warning lamp. This is necessary be-
cause only an ECU can execute triggering the warning lamp in the event of service
information having accumulated.
If a SmartBoard is installed, the warning will also be displayed on the SmartBoard.
Saving the data for the lining change
The last five pad changes (including mileage and operating hours when the second
warning level occurred) are stored in the ECU and can be read out via the TEBS E
Diagnostic Software.
Components
Components / Part number Description Connecting cable
Wear indicator
449 816 ... 0
SmartBoard
446 192 11. 0
Optional
Display for warnings
449 911 ... 0