Bosch ABS M4, User Manual, Page: 20 / 54

four speed sensors to function; otherwise the system assumes there is an error
and shuts down. You should therefore only use the speed sensors as supplied in
the ABS M4 ‐Kit (see section ‐‐‐ MISSING LINK ‐‐‐). We can offer different DF11
versions on request for specific vehicle designs. Existing mounted wheel speed
sensors can be tested and approved by us.
Pay attention to the polarity when you are connecting wheel speed sensors.
The sensor must be installed in the right direction, i.e. the encoder wheel and
sensor must lie in the defined installation position (fixation screw in rotation po‐
sition of the encoder wheel). The sensor will not work if it is installed in a position
other than the recommended installation position. Make sure the sensor is
mounted and secured as tight as possible to prevent sensor errors or failures
from vibration. You can find the sensor's dimensions and how to install the sen‐
sor on ‐‐‐ MISSING LINK ‐‐‐.
Notice
Use only differential sensors, like Bosch DF11 or similar.
Securely mount sensors and pay attention to correct mounting
position (sensors direction sensitive). Sensor holder as stiff as
possible.
Sensor measures and implementation of sensor holder you can
also find in the --- MISSING LINK ---
Encoder Wheel
Encoder wheels usually have 48 teeth. The tooth/gap ratio should be 50 % and
the teeth should be 3 mm in height. The encoder wheel must be made of a ferro‐
magnetic material. If required, Bosch Motorsport can provide technical docu‐
mentation on positioning the encoder wheel. See the back cover of this booklet
for our contact information.
Distance between the Sensor and the
Encoder Wheel
You can adjust the distance between the sensor and the encoder wheel to fit the
encoder wheel's dimensions and other installation conditions, but gap is normal‐
ly between 0.8 ± 0.1 mm.
Notice
Use a ferromagnetic incremental wheel.
Leave a 0.8 ± 0.1 mm gap between sensor and encoder wheel.
For more on assembly see Offer Drawing: Wheel Speed Sensor [
}
46] .
Gyro/Acceleration Sensor
7.4
7.5
7.6
7 | Assembling the Parts
20 / 54 ABS M4 Manual Bosch Motorsport