Honda Civic Service Manual page 1201

Anti-lock Brake System (ABSI
Featu res/Construction
When the brake pedal is depressed during driving, the wheels can lock before the vehicle comes to a stop, In such a case,
the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is reduced if the
rear wheels are locked, creating an extremely unstable condition. The ABS precisely controls the slip rate of the wheels to
ensure the grip force of the tires. and it thereby ensures the maneuverbility and stability of the vehicle.
Judging the vehicle speed. the ABS calculates the slip rate of the wheels based on the vehicle speed and the wheel speed,
then it controls the brake fluid pressure to attain the target slip rate.
Grip Force of Tire and Road Surlace
COEFFICIENT OF
FRICTION
TARGET SLIP RATE
Slip Rate
BRAKING
START POINT
ROTATIONAL
DIRECTION
RADIAL
DIRECTION
OF THE
ROTATIONAL
OIRECTION
A: Distance without slio
8: Slippsd distance
C: Actuel distance
sr-rrmre=f=
SLIP RATE
VEIIICLE SPEED - WHEEL SPEEO
VEHICLE SPEED
19-46