Bosch ABS M4 User Manual page 7

Bosch Motorsport
to position. Finally, with switch position 9 the most progressive effect is ach‐
ieved. With the different control settings, the driver can select the preferable
map for the vehicle, the racetrack and weather. Comment: The most progres‐
sive braking characteristics leads not necessarily to best lap times. Rather the
position that allows the driver to feel the most comfortable will be the most
desirable position.
▪ Two additional vehicle‐specific control maps storable (position 10 and 11)
Switch positions 10 and 11 are pre‐dated with a copy of position 9. Bosch‐
Engineers can calibrate them individually for each customer.
▪ Switch off ABS functions for calibration drives (position 12).
You can switch off the ABS functions by switching to position 12. This can be
very helpful, e.g. for calibration of the brake balance adjuster. All ABS sensor
signals will still be communicated. Every older ABS M4 can be updated to this
function. During warm‐up we recommend to choose position 12. Since soft‐
ware status V1017 no error entry takes place any longer.
▪ Measuring vehicle dynamics
Due to specially‐adapted chassis and tires, motor racing vehicles allow for
significantly higher longitudinal and lateral acceleration rates than series pro‐
duction vehicles. The ABS M4 is designed to intervene after a corresponding
amount of time. Our ABS M4 sensors constantly measure vehicle acceleration
and rotation rates as well as the pressure of the front brake circuit. The ABS
control algorithms at the front brake circuit rely on the measurements of ac‐
celeration and pressure.
▪ Programming and diagnosis software
Each ABS M4 is preprogrammed with specific data related to the vehicle,
such as vehicle mass, wheelbase, track width, tire rolling circumference, etc.
Should the vehicle data change at any time, you can adapt the system set‐
tings by using the RaceABS diagnostic software. You find the software for
free download on our website www.bosch‐motorsport.de.
▪ There are further features to the software:
▪ Performing a system function test
The system function test can diagnose the functional capability and profes‐
sional assembly of any part, without having to move the vehicle.
▪ Reading data from the error log
Any missing part or incorrectly connected electrical connection is signaled by
a lit MIL (Malfunction Indication Lamp). In the error log you can read and an‐
alyze what errors have set the MIL and then delete the errors after the issue
has been resolved.
▪ Repair Bleeding Wizzard
Step‐by‐step instructions will guide you through bleeding the ABS unit.
▪ Connectivity for data loggers and display
You can connect a data logger (e.g. the C 50 from Bosch Motorsport) to the
ABS‐Wiring‐Harness via CAN. The CAN Bus can give you wheelspeeds and
other readings from the system. All ABS M4 CAN messages can be displayed
on any programmable, CAN‐compatible display (e.g. the DDU 7 from Bosch
Motorsport).
ABS M4 Manual
Before Use | 2
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