2007 FORD FIESTA brake

206-09A-3 Anti-Lock Control 206-09A-3
DESCRIPTION AND OPERATION
Anti-Lock Control
Overview
Function
The ABS is a closed loop control system in the
brake system which prevents the wheels from
1 4 1 Ignition lock I situations.
3
1 5 1 Stoplamp switch I
6 ABS warning lamp in the instrument
I 1 cluster
Wheel
speed sensors
In addition to the conventional brake system with
two diagonally split brake circuits, the ABS consists
of an ABS hydraulic unit with integrated control
unit, four wheel sensors and the ABS warning lamp
in the instrument cluster. locking up under
braking and therefore maintains
steerability and driving stability in extreme
Electronic brake force distribution is integrated in
the software of the ABS control unit', which
electronically regulates and optimises the pressure
applied to the wheel brakes on the front and rear
axles in accordance with the operating conditions.
ABS control unit
The ABS control unit continuously compares stored
physical deceleration values with those detected
by the wheel sensors. This allows the lock-up
tendency of each wheel to be detected separately.
If the ABS control unit detects that a wheel is
threatening to lock up, then the corresponding
hydraulic valves in the valve block are either closed
or opened.
The ABS control unit then also passes on the
vehicle speed signal obtained from the wheel sensors to the Powertrain Control Module (PCM).
2006.0 Fiesta 1212oo6 GI 63290en
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206-09A-4 Anti-Lock Control 206-09A-4
DESCRIPTION AND OPERATION
The warning lamp in the instrument cluster is
actuated by the ABS control unit after switching on
the ignition. It remains on up to the end of the ABS
self-test, and is also actuated in the event of
system errors.
It continuously monitors the system for possible
faults and stores these as and when they occur.
The corresponding trouble codes can be
interrogated with the aid of WDS via the DLC
.
The ABS control unit is directly connected via a
diagnostic data link to the DLC.
Valve block
The valve block contains four inlet valves and four
outlet valves. There is one inlet valve and one
outlet valve for each wheel.
When there is no electrical supply the inlet valves
are open and the outlet valves are closed.
The valve block also contains the low-pressure
reservoir and sound damping chambers.
Pump motor
In the event of an ABS intervention the pump motor
ensures that the pressure can be provided to the
regulating channels independently of the brake
master cylinder.
ABS regulating cycle
An ABS regulating cycle has three phases:
Phase
1 - holding pressure
The inlet valve is closed, and the brake pressure
to the wheel brake cannot be increased any
further, even if the actuation pressure (brake
pedal) is increased further.
Phase
2 - pressure reduction
The outlet valve is temporarily opened, and the
brake pressure to the wheel brake is reduced
in a controlled manner.
Phase
3 - pressure build-up
The inlet valve is opened in stages, and the
brake pressure is increased in a controlled
manner to achieve the greatest possible
deceleration.
2006.0 Fiesta 1212006 GI 63290en
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206-0949-5 Anti-Lock Control 206-09A-5 -- -
DESCRIPTION AND OPERATION
Anti-Lock Control
MK70 Anti-lock Brake System (ABS)
The MK70 ABS is similar to the MK60 in
construction and design. The main differences are:
New ABS control unit
New hydraulic lines through a revised valve
block
New wiring harness and electrical connector
(fewer occupied pins)
The MK70 ABS system will be installed from
0512004 in vehicles which only have one ABS
function.
Vehicles with
ESPlBrake Traction Control System
(BTCS) will continue to be equipped with the
MK60.
MK60 ABS
Item Description
Fpump motor I
1 2 I Valve block I
1 3 1 ABS control unit I
The MK60 ABS has been designed specifically for
small to medium size vehicles. Compared to the
MK20 ABS system, it has been possible to reduce
the size of the hydraulic and electric components
(e.g. hydraulic valves and solenoids) and the
housing.
As a result, the overall weight of the ABS hydraulic
unit has been significantly reduced.
The hydraulic unit consists of the pump motor, the
valve block with
8 hydraulic valves and the
electronic control unit.
The ABS control unit actuates the ABS warning lamp in the instrument cluster via the CAN
databus.
The MK60 ABS is a 413 system. This means that
the wheel speed is measured individually for each
wheel (4 wheel speed sensors).
ABS controlled braking is provided individually for the front wheels and jointly for the two rear wheels
(3 control channels; select-low control), i.e. the
ABS control for the rear wheels is governed by the
wheel closest to locking up.
- --
2006.0 Fiesta 1212006 GI 63291 en
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206-09A-8 Anti-Lock Control 206-09A-8
REMOVAL AND INSTALLATION
Hydraulic Control Unit (HCU) - Vehicles Built Up To: 0512004
!'-
Materials Remove
the brake master cylinder to
hydraulic control unit (HCU) brake tubes.
Name
S~ecification
I Super DOT 4 brake fluid I ESD-M6C57-A I
Removal
A CAUTI0N:If brake fluid is spilt on the
paintwork, the affected area must be
immediately washed down with cold water.
I. Remove the brake master cylinder. For
additional information, refer to
Section
206-06 [Hydraulic Brake Actuation].
2. Detach the engine wiring harness electrical
connector from the wheelhouse assembly.
3. CAUTIONS:
&ap the brake tubes to prevent fluid loss
or dirt ingress.
nplug the hydraulic control unit (HCU)
ports to prevent fluid loss or dirt ingress.
N0TE:Make a note of the position of the brake
tubes, to aid installation.
4. CAUTIONS:
&ap the braketubes to prevent fluid loss
or dirt ingress.
Aplug the HCU ports to prevent fluid loss
or dirt ingress.
N0TE:Make a note of the position of the brake
tubes, to aid installation.
Disconnect the brake tubes from the HCU.
2006.0 Fiesta 1212006 GI 83774en
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206-09A-9 Anti-Lock Control 206-09A-9
REMOVAL AND INSTALLATION
6. Disconnect the anti-lock brake system (ABS)
module electrical connector.
11. Detach the HCU and ABS module assembly
from the support bracket.
5. Detach the brake tubes from the bulkhead. 10. Remove the HCU and ABS module
7. Raise and support the vehicle. For additional
information, refer to Section
100-02 [Jacking 12. Remove the HCU to ABS module retaining
and Lifting]. bolts.
/
8. Remove the HCU and ABS module support
bracket lower retaining bolt. assembly
and the support bracket.
9. Lower the vehicle.
13. Remove the HCU.
Installation
1. To install, reverse the removal procedure.
2006.0 Fiesta 1212006 GI 83774en
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206-09A-10 Anti-Lock Control 206-09A-10
REMOVAL AND INSTALLATION
2. Bleed the brake system. For additional
information, refer to Section
206-00 [Brake
System
- General Information].
2006.0 Fiesta 1212006 GI 83774en
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206-09A-1 I Anti-Lock Control 206-09A-I 1
REMOVAL AND INSTALLATION
Hydraulic Control Unit (HCU) - Vehicles Built From: 0512004
/ ! Remove the brake master cylinder to HCU
Materials brake tubes.
Name Specification
I Super DOT 4 brake fluid I ESD-M6C57-A I
Removal
All vehicles
A CAUTI0N:If brake fluid is spilt on the
paintwork, the affected area must be
immediately washed down with cold water.
1. Detach the engine wiring harness electrical
connector from the wheelhouse assembly.
Right-hand drive vehicles
4. Remove the battery tray.
For additional information, refer to: Battery
Tray (414-01 Battery, Mounting and Cables,
Removal and Installation).
5. CAUTIONS:
hap the brake tubes to prevent fluid loss
or dirt ingress.
nplug the hydraulic control unit (HCU)
ports to prevent fluid loss or dirt ingress.
Left-hand drive vehicles N0TE:Make a note of the position of the brake
2. Remove the brake master cylinder. tubes to aid installation.
For additional information, refer to: Brake Disconnect
the brake master cylinder to HCU
Master Cylinder
- LHD (206-06 Hydraulic brake tubes
from the HCU.
Brake Actuation, Removal and Installation).
I
3. CAUTIONS: I
hap the brake tubes to prevent fluid loss
or dirt ingress.
nplug the hydraulic control unit (HCU)
ports to prevent fluid loss or dirt ingress.
N0TE:Make a note of the position of the brake
tubes to aid installation.
All vehicles
6. CAUTIONS:
&ap the brake tubes to prevent fluid loss
or dirt ingress.
2006.0 Fiesta 1212006 G406271 en
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206-09A-I 2 Anti-Lock Control 206-0949-12
REMOVAL AND INSTALLATION
Aplug the HCU ports to prevent fluid loss
or dirt ingress.
N0TE:Make a note of the position of the brake
tubes to aid installation.
Disconnect the brake tubes from the HCU.
Detach the brake tubes from the bulkhead.
7m &AUTION:C~~ the anti-lock brake system
(ABS) module electrical connector and
socket to prevent dirt and fluid ingress.
Disconnect the ABS module electrical
connector.
I. Depress the locking tangs.
2. Release the retainer.
8.
Raise and support the vehicle. For additional
information, refer to: (100-02 Jacking and
Lifting)
Jacking (Description and Operation),
Lifting (Description and Operation).
9. Remove the HCU and ABS module support
bracket lower retaining bolt.
f
10. Lower the vehicle.
11. Remove the HCU and ABS module
assembly and the support bracket.
12. Detach the HCU and ABS module assembly
from the support bracket.
2006.0 Fiesta 1212006 ~406271 en
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