6.6.3 System Working Principle
6.6.3.1 System Working Principle
Anti-lock Braking System (ABS) Hydraulic Piping Diagram
AV
EV
FL
RR
RL
FR
AV
M
LPA
EV
AV
EV
AV
EV
FE06-5601b
Orifice
Legend
1. AV-Inlet Solenoid Valve
2. EV-Outlet Solenoid Valve
3. LPA-Low Pressure Accumulator
4. M-Motor
5. FL-Left Front Wheel
6. RR-Right Rear Wheel
7. RL-Left Rear Wheel
8. FR-Right Front Wheel
Anti-lock Braking System (ABS)
In the anti-lock braking period, anti-lock braking system
controls each wheel braking fluid pressure to prevent wheel
slip. Each wheel is equipped with a separate and specific
hydraulic fluid line solenoid valve. Anti-lock braking system can
reduce, maintain or increase brake fluid pressure to each
wheel. However, the anti-lock braking system can not make the
pressure exceed the pressure provided by the brake master
cylinder. During the anti-lock braking, a series of rapid pulse
can be felt on the brake pedal. When the ABS control module
detects the speed sensor input and tries to prevent wheel slip,
each solenoid valve position rapidly changes. ABS pump starts
working, resulting pulse. Pedal pulse only appears during the
anti-lock braking, and disappears during the normal braking or
parking. For vehicles equipped with anti-lock braking system,
apply normal force on the brake pedal can stop the vehicle.
Anti-lock braking system can effectively shorten the braking
distance and maintain the vehicle stability. During the anti-lock
braking, brake system pressure is adjusted in three stages.
Brake System
ABS / TCS / EBD / ESP
6-71
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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