Principle Of Operation; Features - Bosch ABS M4 Kit Manual

2 | Before Use
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increased deceleration rates. To consider different chassis tuning and tires ABS
M4 has nine control settings. They differ from each other belonging start and
process of control. With this the driver can choose the best setting for his vehicle.
Furthermore the ABS provides the opportunity to program two individual control
settings for you vehicle. For calibration drives the ABS function can be deactiva‐
ted separately, whereby all ABS sensor signals are transmitted and processed fur‐
thermore.
2.3

Principle of Operation

ABS M4 is suitable for front-wheel, rear-wheel and four-wheel drive vehicles.
It is based on a series production ABS and adapted in years of development work
to meet motorsport requirements.
The ABS prevents the wheels from locking during braking. It does this by con‐
stantly measuring the individual wheel speeds and comparing them with the
wheel speeds predicted by the system. If, during braking, the measured wheel
speed deviates from the system's predicted wheel speed, the ABS controller
takes over, correcting the brake force to keep the wheel at the optimum slip level
and so achieving the highest possible deceleration rate. This is carried out sepa‐
rately for each wheel.
When the brake force is reduced by the ABS, brake fluid is released from the
brake caliper and fed into the pressure reservoir of the hydraulic power unit of
the ABS. The hydraulic power unit then feeds the fluid back into the master cylin‐
der via a piston pump driven by an electric motor. The driver can hear this return
pumping of the brake fluid and feel the response of the brake pedal.
2.4

Features

▪ Note: In the following we only refer to the Standard ABS Scale. The Alterna‐
tive Scale is only used for DF11S, 1 Mbaut. You can use the alternative ABS
Scale if your ABS M4 is switched off in position 1.
▪ Nine different control settings, selectable via a switch in the cockpit (position
1‐9)
The ABS map switch in the cockpit enables the driver to select various control
settings stored in the control device. Using the standard ABS scale it starts
with switch position 1 for the most sensitive controller setting (e.g. heavy rain
condition). The response characteristic gets more progressive from position
to position. Finally with switch position 9 the most progressive effect is ach‐
ABS M4 Manual Bosch Motorsport