2007 FORD FIESTA Workshop Manual

206-07-9 Power Brake Actuation 206-07-9
REMOVAL AND INSTALLATION
N0TE:On vehicles equipped with EBA the brake
booster is identified by a white sticker showing a
( large letter "A.
N0TE:lnstall a new brake booster gasket.
To install, reverse the removal procedure.
2006.0 Fiesta 121~0o6 G89214en
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206-09A-1 Anti-Lock Control 206-09A-I
SECTION 206-09A Anti-Lock Control
CONTENTS
PAGE
SPECIFICATIONS
........................................................................\
.............................................. Specifications 206-09A-2
DESCRIPTION AND OPERATION
........................................................................\
......................................... Anti-Lock Control 206-09A-3
........................................................................\
..................................................... Overview 206-09A-3
Function
........................................................................\
...................................................... 206-09A-3
Anti-Lock Control
........................................................................\
........................................ 206-09A-5
MK70 Anti-lock Brake System (ABS) ........................................................................\
......... 206-09A-5
........................................................................\
.................................................. MK60 ABS 206-09A-5
DIAGNOSIS AND TESTING
........................................................................\
........................................ Anti-Lock Control 206-09A-7
........................................................................\
.......................... Inspection and Verification 206-09A-7
REMOVAL AND INSTALLATION
......................................... Hydraulic Control Unit (HCU) -- Vehicles Built Up To: 0512004 206-09A-8
.......................................... Hydraulic Control Unit (HCU) -- Vehicles Built From: 0512004 206-09A-11
Anti-Lock Brake System (ABS) Module -- Vehicles Built Up To: 0512004 ......................... 206-09A-14
.......................... Anti-Lock Brake System (ABS) Module -- Vehicles Built From: 0512004 206-09A-17
........................................................................\
..... Rear Wheel Speed Sensor
(12 785 0) 206-09A-20
Rear Wheel Speed Sensor Ring
................................................................... (12 788 0) 206-09A-22
Front Wheel Speed Sensor
........................................................................\
.... (12 784 0) 206-09A-24
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206-09A-2 Anti-Lock Control 206-09A-2
SPECIFICATIONS
Lubricants, Fluids, Sealers and Adhesives
Specificat
1 ions I
I Super DOT 4 brake fluid
Hydraulic control unit (HCU) to support bracket
retaining bolts
I Wheel speed sensor retaining bolts I 9 I - I 80 I
HCU support bracket retaining bolts
Brake tube to HCU unions
I Anti-lock brake system (ABS) module to HCU I 5 I - I 44 I
I retaining bolts
20
18
2006.0 Fiesta 1212006 GII 2960en
15
13 -
-
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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-6 Anti-Lock Control 206-09A-6
DESCRIPTION AND OPERATION
Wheel speed sensors
I f
The wheel speed sensors are active sensors. They
are supplied with a voltage from the ABS control
unit after the ignition is switched on.
Item Description The ABS control unit can be diagnosed via the
The pulses are picked up from a mechanically
encoded ring, which is built into the wheel bearings
on the front wheels while for the rear wheels it is
a metal ring which is mounted on the stub axle.
The registered wheel speed is converted into a
digital (square-wave) signal by the electronics
integrated in the sensor and is then transmitted to
the ABS control unit. Data Link Connector
(DLC).
The hydraulic unit is pre-filled for service.
1
2
Data transmissions to the ABS control unit take
place via a 2-stranded connecting cable.
NOTE: The wheel speed sensors must not be
checked for voltage with an ohmmeter.
Sensor
Installation position.
It also supplies the vehicle speed signal, which is
calculated from the wheel speed sensor signals.
This is transmitted via the CAN bus to the
Powertrain Control Module (PCM)
2006.0 Fiesta 1212006 GI 63291 en
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