Section II Principle of ABS
I. Control Principle of ABS
Fig. 3-2 shows the control principle of ABS.
Fig. 3-2
II. Operating Mode of ABS
1. Operating condition of regular brake (Table 3-1 and Fig. 3-3).
Table 3-1
Solenoid valve Electricity Solenoid valve condition
Normally opened valve Off Open
Normally closed valve Off Closed
Fig. 3-3
The pressure of master pump will be transmitted to wheel slave cylinder through normally opened
valve to apply the brake. If no further braking is needed, the driver can reduce the pressure to the
brake pedal, which allows the brake fluid return to master pump for pressure decrease.
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