2013 SSANGYONG NEW ACTYON SPORTS lock

09-4
2. SYSTEM OVERVIEW
1) Terms and Definition
CBS: Conventional Brake System
ABS: Anti-Lock Brake System
EBD: Electronic brake-Force Distribution
ESP: Electronic Stability Program
ABD: Automatic Braking Differential
ASR: Acceleration Slip Regulation
AYC: Active Yaw Control (Understeer and Oversteer Control)
HBA: Hydraulic Brake Assistant
ARP: Active Rollover Protection
HSA: Hill Start Assistant
Brake pad: Brake pad is a component of disk brakes used in automotive and other applications.
Brake pad is steel backing plates with friction material bound to the surface that faces the brake disc.
Brake disc: The brake disc is a device for slowing or stopping the rotation of a wheel while it is in
motion.
Brake caliper: To stop the wheel, friction material in the form of brake pads (mounted on a device
called a brake caliper) is forced hydraulically against both sides of the disc. Friction causes the disc
and attached wheel to slow or stop.
Brake master cylinder: The brake master cylinder is a control device that converts non-hydraulic
pressure (commonly from a driver's foot) into hydraulic pressure, in order to move other device(s)
which are located at the other end of the hydraulic system, such as one or more slave cylinders. As
piston(s) move along the bore of the master cylinder, this movement is transferred through the
hydraulic fluid, to result in a movement of the slave cylinder(s). The hydraulic pressure created by
moving a piston (inside the bore of the master cylinder) toward the slave cylinder(s) compresses the
fluid evenly, but by varying the comparative surface-area of the master cylinder and/or each slave
cylinder, one will vary the amount of force and displacement applied to each slave cylinder (relative to
the amount of force and displacement that was applied to the master cylinder). -
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FunctionVehicle with CBS
Vehicle with ABS/EBD Vehicle with ESP
ABS
Not appliedApplied
Applied EBD Applied
ABD
Not applied ASR
AYC
HBA
ARP
2) Functions

09-14
Specified value (B)155mm
Push rod
Stop lamp
switch Pedal Height ▶
Check the pedal height with below procedures: -
Start the engine and measure the length (A)
between floor mat and pedal.
If the measured value is out of the specified
value, adjust the length. 1.
2.
Adjust the pedal height with below procedures: -
Disconnect the stop lamp switch connector.
Unscrew the lock nut and remove the stop
lamp switch assembly.
Loosen the lock nut on the pedal push rod.
Turn the pedal push rod to adjust the pedal
height.
Tighten the lock nut.
Install the stop lamp switch assembly.
Connect the stop lamp switch connector.
Check if the stop lamps come on when
pressing the brake pedal around 5 mm.
If the stop lamp dpes not come on, adjust the
stop lamp switch assembly again.
If the stop lamps come on, tighten the lock nut
and measure the pedal height again. 1.
2.
3.
4.
5.
6.
7.
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10.

09-174850-01
Brake Fluid ▶
Brake Fluid Type ▶ 1. Color
Ligh gold (New oil) → Brown → Black -
2. Service Interval/Type
Change: every 2 years, Type: DOT4
The water in the brake fluid has an adverse effect to the brake system. If the fluid contains
around 3% of water, the boiling point of the brake fluid goes down by 25%. It will cause the vapor
lock frequently.
Water content in fluid: around 3% after 18 months, around 7~10% after few years
The water ib fluid makes the corrosion in the brake lines, deforms and deteriorates the rubber
components, brake calipers and pistons. -
DOT4: Brake fluid for premium vehicle. Lower water absorbing rate AND higher boiling point than
DOT3
Brake Fluid Level Check ▶
The brake fluid level should be between "MAX"
and "MIN" on the reservoir. If it is below "MIN"
mark, check for oil leaks and refill the reservoir
with the specified fluid.

10-34892-01
1. SPECIFICATION
Unit DescriptionSpecification
Remark
ABS ESP
HECU Clock frequency 32MHz 50MHz
Memory 128KB 256KB
S-sensor Operating voltage 4.75~5.25V
None (functions in
sensor cluster)Installed in IP
panel behind
audio (only for
4WD) Operating temperature-30 ~ 85℃
Operating range -1.5 ~ 1.5g
Output voltage 0.5 ~ 4.5V
Wheel speed
sensorSupplying voltage 4.5 ~ 16V←
Output current (approx. 2.7
km/h of vehicle speed)7mA(Lo) ~ 14mA
+20%←
Operating temperature-40 ~ 150℃ ←
Operating frequency 1~2500Hz←

10-6
1. SYSTEM OVERVIEW
1) What is ABS?
When braking suddenly or braking on slippery roads, the vehicle keeps moving forward but the wheels
are locking and not rotating. If these happen, the vehicle may lose stability or rotate resulting in an
accident. ABS helps to maintain directional stability and control of the vehicle. ABS is designed to
secure more safety and increase the control of steering wheel during emergency braking situation. But,
ABS does not guarantee perfect safety beyond its physical limit. ABS in this vehicle contains EBD
function. In normal driving conditions, the brake system operates without ABS function.
2) What is EBD (Electronic Brake-force Distribution)?
EBD is an automobile brake technology that automatically varies the amount of force applied to each of a
vehicle's brakes, based on road conditions, speed, loading, etc. Always coupled with anti-lock braking
systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping
power whilst maintaining vehicular control. EBD does not operate when ABS is working.
ABS effect according to braking conditions ▶
Braking on split road Maneuvering while braking

10-134892-01
5. SYSTEM OPERATION
1) Block Diagram of ABS HECU

10-14
2) Basic Theory of ABS Function
To give you a better understanding of the tasks and functions of ABS, we will first look at the physics
principles.
(1) Stopping distance
(2) Brake force on a wheel
The maximum possible brake force on a wheel depends on the wheel load and the adhesion coefficient
between tire and carriageway. With a low adhesion coefficient the brake force, which can be obtained is
very low. You are bound to know the result already from driving on winter roads. With a high adhesion
coefficient on a dry road, the brake force, which can be obtained, is considerably higher. The brake
force, which can be obtained, can be calculated from below formula:
Maximum brake force ▶
FBmax = wheel load FR x coefficient of
frictionMh
The braking process cannot be described
sufficiently accurately with the brake forces
calculated. The values calculated only apply if
the wheel is not locked. In the case of a locking
wheel, the static friction turns into lower sliding
friction, with the result that the stopping distance
is increased. This loss of friction is termed "slip"
in specialist literature.
The stopping distance depends on the vehicle weight and initial speed when braking starts. This also
applies for vehicle with ABS, where ABS always tries to set an optimum brake force on each wheel. As
great forces are exerted between the tires and the carriageway when braking, even with ABS the wheels
may scream and rubber is left on the road. With an ABS skid mark one may be able to clearly recognize
the tire profile. The skid mark of an ABS vehicle does not however leave any hint of the speed of the
vehicle in the case of an accident, as it can only be clearly drawn at the start of braking.

10-154892-01
Slip ▶
The brake slip is the difference between the vehicle speed and the wheel circumference speed. If the
wheel locks, the slip is greatest, that is 100 %. If the wheel is running freely and un-braked, the slip is the
lowest, equal to 0 %. Slip can be calculated from the vehicle speed Vveh and the wheel speed Vw. The
equation for this is:
Vveh = 100 km/h, Vw = 70 km/h
Slip ratio (S) = X 100%
S = 30%Vveh - Vw
Vveh
Typical Slip Curves ▶
For the various road conditions, the friction
coefficients were plotted. The typical course of
the curves is always the same. The only special
feature is shown by the curve for freshly fallen
snow, for this curve increases at 100 % slip. In
a vehicle without ABS, the wheel locks on
braking and therefore pushes a wedge before
it. This wedge of loose surface or freshly fallen
snow means and increased resistance and as
a result the stopping distance is shorter. This
reduction in stopping distance is not possible
with a vehicle with ABS, as the wheel does not
lock. On these surfaces the stopping distance
with ABS is longer than without ABS. The
reason for this is based in physics and not in
the Anti-Lock System.
However, as mentioned before, ABS is not
about the stopping distance, but
maneuverability and driving stability, for the
vehicle with locking wheels without ABS cannot
be steered. Ex)