Bosch ABS M4, User Manual, Page: 19 / 54

Notice
Correct position for installation – brake line connections should
face upwards.
Install with rubber pads/blocks to reduce vibration.
Leave 10 mm or larger gap in between the vehicle chassis and
bottom of assembly plate.
Hydraulic power unit is already filled with brake fluid.
For more on assembly: See
Offer Drawing: Hydraulic Power Unit
with attached Control Unit [
}
43] .
Notice
Conform to FIA rules
With only 8 valves the ABS M4 ECU fulfills the FIA require-
ments for GT 3.
Brake Pressure Sensor
The brake pressure sensor is installed into the front axle brake circuit between
the master cylinder and the hydraulic power unit. The sensor is metric thread,
M10x1. Before assembly, fill the sensor with brake fluid, e.g. with a small medical
syringe. So the brake system can be fully bled, the measuring hole of the brake
pressure sensor should point upwards.
Notice
Only use the supplied brake pressure sensor, otherwise ABS M4
will be destroyed.
Install into the front axle brake circuit between the master cyl-
inder and the hydraulic power unit as far away from the power
unit as possible to avoid vibration-caused damages.
Fill sensor with brake fluid before installing.
For more on assembly: See
Offer Drawing: Brake Pressure Sen‐
sor [
}
44] .
Wheel Speed Sensors
Bosch Motorsport ABS M4 needs special edited wheel speed signals, which are
supplied only from active speed sensors like e.g. from Bosch DF11‐family. These
double hall sensors operate on the differential principle. The ABS M4 needs all
7.2
7.3
Assembling the Parts | 7
Bosch Motorsport ABS M4 Manual 19 / 54