ABS <4WD> -
General Information
35B-2
GENERAL INFORMATION
ABS has been adopted as standard equipment
in all vehicles to maintain directional stability and
steering performance during sudden braking.
The ABS control method used is a 4-sensor,
4-channel method (previous models: 4-sensor,
3
-channel method
)
which allows the brake
pressures for all four wheels to be controlled
independently of each other. The system has the
following features.
D
EBD
*
(Electronic Brake force Distribution
system) control has been added to provide the
ideal braking force for the rear wheels.
D
The hydraulic unit function has been integrated
with the hydraulic brake booster (HBB).
D
Select solenoid valves (two valves for FL and
FR) have been adopted in order to reduce the
pedal kickback and improve the operation
feeling when the ABS is operating.
D
Independent 4-wheel control is carried out wile
the vehicle is turning in order to increase the
braking force.
NOTE
*EBD: Electronic Brake-force Distribution
EBD CONTROL
In ABS, electronic control method is used whereby
the rear wheel brake hydraulic pressure during
braking is regulated by rear wheel control solenoid
valves in accordance with the vehicle’s rate of
deceleration and the front and rear wheel slippage
which are calculated from the signals received from
the various wheel sensors. EBD control is a control
system which provides a high level of control for
both vehicle braking force and vehicle stability. The
system has t he following features.
D
Because the system provides the optimum rear
wheel braking force regardless of t he vehicle
laden condition and the condition of the road
surface, the system reduces the required pedal
depression force, particularly when the vehicle
is heavily laden or driving on road surfaces
with high frictional coefficients.
D
Because the duty placed on the front brakes
has been reduced, the increases in pad
temperature can be controlled during front
brakes applying to improve th e wear resistance
characteristics of the pad.
D
Control valves such as t he proportioning valve
are no longer required.
SPECIFICATIONS
Item Specifications
ABS control method 4-sensor, 4-channel
No. of ABS rotor teeth
Front 50
Rear 50
ABS speed sensor
Type Magnet coil type
Gap between sensor and rotor mm 0.9 (non-adjustable type)
www.WorkshopManuals.co.uk
Purchased from www.WorkshopManuals.co.uk
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