2012 SSANGYONG NEW ACTYON SPORTS brake sensor

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1. SPECIFICATION
Unit Description Specification
Front brake Type Ventilated disc
Outer diameter of discØ294 mm
Inner diameter of caliper cylinderØ43.0 x 2 mm
Thickness of disc 28 mm (wear limit: 25.4 mm)
Area of brake pad Above 60 cm2
Pad wear indicator Mechanical type
Rear brake Type Solid disc
Outer diameter of discØ299 m
Thickness of disc 10.4 mm (wear limit: 8.5 mm)
Area of brake pad Above 28.8 cm2
Pad wear indicator Mechanical type
Brake booster Type Vacuum assist type
Size8” + 9” (Tandem)
Master cylinder Type Tandem type(integrated level sensor)
Inner diameter of cylinderØ26.99 mm
Brake pedal Maximum operating stroke 150 mm
Pedal ratio 4 : 1
Free play 3 to 10 mm
Parking brake Type Mechanically expanded rear lining
Operating type Hand operated type
Inner diameter of drumØ190 mm
Brake oil Specification DOT 4
Capacity 0.7 to 0.8 liters
Service Interval: Change the brake oil at every 2 years
DOT?
It is the quality grade of brake fluid established by US Department of Transportation.

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Front Brake AssemblyFront Wheel Speed Sensor (4WD)
HECU
2. SYSTEM LAYOUT
Master Cylinder and Booster
Brake Pedal

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Rear Wheel Speed Sensor (4WD)
Rear Brake Assembly
ABS/EBD Indicators
Parking Brake Lever
Parking Brake

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Front wheel speed sensor (4WD)
Located on the hub assembly.
Front discFront caliper assembly (2WD/4WD)
Located on the knuckle.
ABS hydraulic device and control unit
Located near the brake booster in engine compartment.

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3. ABS CONTROL LOGIC
The principal ABS control logic is the determination of the reference speed by choosing one
wheel meeting a certain condition, while sensing the speed information from 4 wheel speed
sensors when the vehicle is being driven.
For example, when the comparison of the reference speed with front right wheel speed shows a
slip, the control signal is determined according to whether it's deceleration or acceleration. If the
control conditions are met, the brake for the front right wheel will be got under control.

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2) EBD (Electronic Brake-force Distribution) Warning Lamp
EBD warning lamps (brake warning lamp and ABS warning lamp) come on when the system
performs the self diagnosis and when it detects the malfunction of EBD system. However, the
brake warning lamp comes on regardless of EBD system when the parking brake is applied.
EBD warning lamp ON:
When turning the ignition switch to ON position, ABS warning lamp and the brake warning
lamp comes on for 3 seconds for self diagnosis and goes off if the system is OK
(initialization mode).
When applying the parking brake, the brake warning lamp comes on.
When the brake fluid is not sufficient, the brake warning lamp comes on.
When disengaging the connector, the warning lamp comes on.
When the system is defective, ABS warning lamp and the brake warning lamp come on
simultaneously. A.
B.
C.
D.
E.
When the solenoid valve is defective
When one or more wheel sensors are defective
When ABS HECU is defective
When the voltage is abnormal
When valve relay is defective a.
b.
c.
d.
e.
When the communication between warning lamp CAN modules in meter cluster is failed,
the warning lamp comes on. F.

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3) Basic ABS Control
Operation of ABS control unit ▶
Applications of the ABS control unit The
signals produced by the wheel sensors are
evaluated in the electronic control unit. From
the information received, the control unit
must first compute the following variables:
Wheel speed
Reference speed
Deceleration
Slip -
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-
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Reference speed ▶
The reference speed is the mean, I.e. average speed of all wheel speeds determined by simple
approximation.
Simplified ABS control ▶
If, during braking, one wheel speed deviates from the reference speed, the ABS control unit
attempts to correct that wheel speed by modulating the brake pressure until it again matches the
reference speed. When all four wheels tend to lock, all four wheels speeds suddenly deviate from
the previously determined reference speed. In that case, the control cycle is initiated again in
order to again correct the wheel speed by modulating the brake pressure.

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5) EBD (Electronic Brake Force Distribution) System
System description ▶
As an add-on logic to the ABS base algorithm, EBD works in a range in which the intervention
thresholds for ABS control are not reached yet.
EBD ensures that the rear wheels are sensitively monitored for slip with respect to the front axle. If
slip is detected, the inlet valves for the rear wheels are switched to pressure hold to prevent a
further increase in pressure at the rear-wheel breaks, thus electronically reproducing
a pressure-reduction function at the rear-wheel brakes.
ABS features an enhanced algorithm which includes control of the brake force distribution
between the front and rear axles. This is called Electronic Brake Distribution. In an unloading car
condition the brake efficiency is comparable to the conventional system but for a fully loaded
vehicle the efficiency of the EBD system is higher due to the better use of rear axle braking
capability.
Advantages ▶
Elimination of conventional proportioning
valve EBD utilizes the existing rear axle
wheel speed sensor to monitor rear wheel
slip.
Based on many variables in algorithm a
pressure hold, increase and/or decrease
pulsetrain may be triggered at the rear
wheels insuring vehicle stability.
Vehicle approaches the ideal brake force
distribution (front to rear).
Constant brake force distribution during
vehicle lifetime.
EBD function is monitored via ABS safety
logic (conventional proportioning valves are
not monitorable). -
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Ideal distribution
EBD start point
Cut-in point
Fixed distribution 1.
2.
3.
4.