FORD FIESTA 2007 Workshop Manual

206-06-7 Hydraulic Brake Actuation 206-06-7
REMOVAL AND INSTALLATION
3. Remove the brake pedal.
6. Remove the brake pedal bushings.
Installation
Im ACAUTION:D~ not drop or knock the brake
pedal. Failure to follow this instruction will
cause damage to the brake pedal decoupler
mechanism (if equipped).
To install, reverse the removal procedure.
2006.0 Fiesta 1212006 G89190en
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206-06-8 Hydraulic Brake Actuation 206-06-8
REMOVAL AND INSTALLATION
Brake Master Cylinder - RHD(12 343 0)
Removal 4. Tighten the bleed nipple. \,
All vehicles
CAUTI0N:lf brake fluid is spilt on the
paintwork, the affected area must be
immediately washed down with cold water.
I. Disconnect the brake vacuum pipe from the
brake booster.
I. Unclip the brake vacuum pipe.
2. Disconnect the brake vacuum pipe.
6. Install the brake fluid reservoir cap.
7m &AUTION:C~~ the brake tubes to prevent
fluid loss or dirt ingress.
Disconnect the brake tubes from the brake
master cylinder.
2. Disconnect the battery ground cable. For
additional information, refer to
Section
414-01 [Battery, Mounting and
Cables].
3. Remove the windshield wiper motor
assembly. For additional information, refer
to Section
501 -1 6 [Wipers and Washers].
4m &AUTION:T~~ brake fluid reservoir cap
must not become contaminated.
Vehicles with anti-lock brakes
Remove the brake fluid reservoir cap.
5. N0TE:lt will be necessary to carry out this 8m &AUTION:C~~ the brake tubes to prevent
fluid loss or dirt ingress.
step on both sides in order to completely
drain the brake fluid reservoir.
Drain the brake fluid reservoir.
1. Connect one end of a suitable piece of clear
plastic pipe to the bleed nipple and place the
other end into a suitable container.
2. Loosen the bleed nipple.
3. Depress the brake pedal until all the fluid is
drained from the brake fluid reservoir.
2006.0 Fiesta 1212006 ~89191 en
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206-0619 Hydraulic Brake Actuation 206-0619
REMOVAL AND INSTALLATION
Disconnect the brake tubes from the brake 11. Disconnect the low brake fluid warning
master cylinder. indicator switch electrical connector.
I
All vehicles
9m &AUTION:C~~ the clutch master cylinder
feed hose to prevent fluid loss or dirt
ingress.
Disconnect the clutch master cylinder feed
hose from the brake fluid reservoir.
12. Remove the brake master cylinder and
brake fluid reservoir assembly.
Installation
A CAUTI0N:Make sure the brake master
cylinder vacuum seal is correctly
positioned before installation.
I. To install, reverse the removal procedure.
2. Bleed the brake system. For additional
information, refer to Section
206-00 [Brake
System
- General Information].
10. Detach the brake master cylinder from the
brake booster.
2006.0 Fiesta 1212006 G89191 en
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206-07-2 Power Brake Actuation 206-07-2
SPECIFICATIONS
Torque Specifications
I Brake master cylinder retaining nuts I 25 I 18 I - I
Description
Brake booster retaining nuts
2006.0 Fiesta 1212006 ~28531 en
Nm
25
Ib-ft
18
lb-in
-
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206-0713 Power Brake Actuation 206-0713
DESCRIPTION AND OPERATION
Brake Booster
Emergency brake assistant (EBA) EBA operates purely mechanically, and is
completely integral with the brakeservo.
As ABS braking systems have become widespread,
it has emerged that because of incorrect use of the
Brake servo units with and without EBA are
brakes, many drivers are losing the safety benefit externally identical. For identification purposes,
which ABS
~rovides. brake servo units with EBA carry a white sticker I showing a large letter "A. Drivers are applying the brakes too timidly.
Because of this, the Anti-lock Braking System The tandem master cylinder
is the same for
(ABS) does not engage, and the maximum braking
vehicles with or without
effect is not achieved.
The EBA recognises from the driver's manner of
braking that an emergency situation is occurring,
and automatically applies full braking power.
This occurs in a matter of milliseconds, which is
faster than the driver could do it.
Furthermore, it was observed that after the first
heavy application of the brake pedal, the driver
releases the pressure on the pedal too early.
The EBA ensures that the ABS effect still continues
when the pedal pressure would normally lie below
the ABS range of control. The system is available
j as an option depending on market and vehicle
variant.
Function
In normal braking situations, the brake servo with
EBA operates in the same way as a conventional
brake servo unit. This means that the driver can
always modulate the brakes.
If an activation threshold defined by a characteristic
curve is exceeded during braking, the EBA
operates.
Determination of the activation threshold is based
on the pedal movement parameters, which are a
function of the pressure on the brake pedal and
the speed of movement of the pedal.
Depending on driving manner, EBA results in a The characteristic curve
is separately defined for
reduction in braking distance of 15% for each vehicle model.
experienced drivers, to over
40% for average The mechanical EBA uses the fact that in a brake
drivers. servo unit, the valve piston moves ahead of the
Because EBA decelerates the vehicle up to the control housing
when a braking operation starts.
wheel locking limit, emergency brake assist is only Because of this, there is a relative travel distance used in vehicles with ABS.
between the control housing and the valve piston
which can vary depending on the force applied to
Components the brake pedal and the pedal speed.
The relative travel distance is small when the pedal
moves slowly with low force applied to it. The
relative travel distance is larger when the pedal
moves faster with higher force applied to it.
Item Description
-
2006.0 Fiesta 1212006 GI 63289en
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206-07-4 Power Brake Actuation 206-07-4
DESCRIPTION AND OPERATION
Item Descri tio on
I 1 I Relative travel distance I
r2 bontro~ housing I
1 3 (Valve piston I
Normal braking
2006.0 Fiesta 1212006 GI 63289en
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206-07-5 Power Brake Actuation 206-07-5
DESCRIPTION AND OPERATION
Item Description
1 3 I Valve piston I
i '
1 4 1 Ball I
1 5 1 ~ock sleeve I
I
2
1 6 1 Ball cage I
Ball sleeve
Control housing
Active brake assistant
In a normal braking operation, pedal operation
causes the relative travel distance to remain so
small that the distance required for engagement is
not exceeded.
The lock sleeve is held in its rest position by the
force applied by the spring, the ball cage remains
free to move axially and the balls remain free to
move radially.
Item Description
I 1 I Relative travel distance I
1 2 1 Disc valve I -
1 3 1 Key I
If the activation threshold level is.exceeded
because of an emergency braking situation, i.e.
the relative travel distance of the valve piston is so
great that the balls are moved in over the slope of
the ball sleeve, then the lock sleeve can move
completely to its end position.
I
--
The balls are now locked, and the ball sleeve can
no longer be moved in the closing direction of the
disc valve.
The EBA is now active, the brake pressure is
increased up to the wheel locking limit, and the
brake pedal can be moved to its maximum
pressure point without effort.
The brake pressure remains at the ABS control
limit until the EBA is completely released again.
2006.0 Fiesta 1212006 GI 63289en
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206-0716 Power Brake Actuation 206-0716
DESCRIPTION AND OPERATION
Release of the brake assistant
Item Description
I I I ~ock sleeve I
1 3 IVacuum cylinder I
To release EBA, the brake pedal must be fully
released,
i.e. it must be returned to its rest position.
When this occurs, the control housing together with
the valve piston move back into the rest position.
The key is pressed against the stop on the vacuum
cylinder and by this the lock sleeve is slid back into
its rest position.
The balls can again be moved outward by the ball
sleeve, and the ball cage is again free to move
axially and the balls free to move radially.
Service
It is not possible to repair the EBA. A new brake
servo unit must be installed.
2006.0 Fiesta 12/2006 GI 63289en
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