torque ASTON MARTIN V8 VANTAGE 2010 Workshop Manual

Brake Actuation System (06.06)
Brake System (06.00)
May 2007 Workshop Manual 6-6-7
Brake Master Cylinder to Modulator
Primary Tube Assembly-Renew
Removal
1. Raise vehicle on ramp.
2. Remove road wheel(s).
3. Remove LH front wheel arch liner (see Workshop Manual procedure 01.02.FB/01.02.BC Wheel Arch
Liner - Front - LH - Renew).
4. Remove bleed nipple dust caps.
5. Position bleed container, connect bleed hose to LHR Caliper, open bleed nipples (x1).
6. Position bleed container, connect bleed hose to LHF Caliper, open bleed nipples (x1).
7. Depress brake pedal >60 mm and secure with support.
8. Tighten LHR bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
9. Tighten LHF bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap. 10. Loosen and disconnect brake tube union from
modulator (see Fig. 1).
11. Loosen and disconnect brake tube union from master cylinder.
12. Remove brake tube.
Installation
1. Install brake tube, connect and torque tighten unions.
2. Install LH front wheel arch liner (see Workshop Manual procedure 01.02.FB/01.02.BC Wheel Arch Liner - Front
- LH - Renew).
3. Remove pedal support.
4. Top-up brake fluid.
5. Brake bleed (see Workshop Manual procedure 06.07.DD Brake Hydraulic System - Flush/Refill/Bleed).
6. Install road wheel(s)).
7. Lower vehicle on ramp.
Repair Operation Time (ROT)
Fig. 1
A0606126

Brake Actuation System (06.06)
Brake System (06.00)
6-6-8 Workshop Manual May 2007
Rear Wheel Brake Front to Rear Tube
Assembly-Renew
Removal
1. Raise vehicle on ramp.
2. Remove RH/LH front an d rear road wheel(s).
3. Remove RH/LH front wheel arch liner (see Workshop
Manual procedure 01.02.FB/01.02.GB Wheel Arch
Liner - Front - LH - Renew).
4. Remove bleed nipple dust caps.
5. Position bleed container, connect bleed hose to RHR/ LHR Caliper, open bleed nipples (x1).
6. Position bleed container, connect bleed hose to RHF/ LHR Caliper, open bleed nipples (x1).
7. Depress brake pedal >60 mm and secure with support.
8. Tighten RHR/LHR bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
9. Tighten RHF/LHF bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
10. Remove screws (x5) securi ng RH/LH rear wheel arch
liner to body.
11. Ease wheel arch liner downwards to access brake tube rear in line connection. 12. Loosen and disconnect RH/LH rear brake tube union
from front line connection (see Fig. 1).
13. Loosen and disconnect RH /LH brake tube union from
rear in line connection (see Fig. 2).
14. Release brake tube from clips (x6), remove brake tube.
Installation
1. Install brake tube, connect unions, secure brake tube in clips (x6), torque tighten unions.
2. Position LH/RH rear wheel arch liner, install and tighten screws (x5).
3. Install RH/LH front wheel arch liner (see Workshop Manual procedure 01.02.FB/01.02.GB Wheel Arch
Liner - Front - LH/RH - Renew).
4. Remove pedal support.
5. Top-up brake fluid.
6. Bleed brake Caliper with assistance.
7. Remove bleed bottle.
8. Install bleed nipple dust caps.
9. Clean off excess fluid.
10. Top-up brake fluid.
11. Install road wheel(s)).
Repair Operation Time (ROT)
Fig. 1
Fig. 2
A0606128
A0606135

Brake Actuation System (06.06)
Brake System (06.00)
6-6-10 Workshop Manual May 2007
10. Release brake tube from clips (x4), remove brake tube (see Fig. 3).
Installation
1. Install brake tube, connect unions, secure brake tube in clips (x4), torque tighten unions.
2. Remove pedal support.
3. Top-up brake fluid.
4. Bleed brake Caliper with assistance.
5. Remove bleed bottle.
6. Install bleed nipple dust caps.
7. Clean off excess fluid.
8. Top-up brake fluid.
9. Install Bulkhead heatsheild (see Workshop Manual procedure 02.06.BC Heatshield - Bulkhead - Renew).
Rear Wheel Brake Tube Assembly-Renew
Removal
1. Raise vehicle on ramp.
2. Remove road wheel(s).
3. Remove LH/RH front wheel arch liner (see Workshop Manual procedure 01.02.FB/01.02.GB Wheel Arch
Liner - Front - LH/RH - Renew).
4. Remove bleed nipple dust caps.
5. Position bleed container, connect bleed hose to RHR/ LHR Caliper, open bleed nipples (x1).
6. Position bleed container, connect bleed hose to RHF/ LHF Caliper, open bleed nipples (x1).
7. Depress brake pedal >60 mm and secure with support.
8. Tighten RHR/LHR bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
9. Tighten RHF/LHF bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
10. Loosen and disconnect RH/LH rear brake tube union from modulator (see Fig. 1).
Fig. 3
Repair Operation Time (ROT)
A0606134
WAR NI NG
AVOID SKIN / EYE CONTACT OR INGESTION OF
BRAKE FLUID. IF SKIN OR EYES ARE SPLASHED WITH BRAKE FLUID, RINSE THE AFFECTED AREA
IMMEDIATELY WITH PLENTY OF WATER AND OBTAIN
MEDICAL ATTENTION. IF BR AKE FLUID IS INGESTED,
OBTAIN IMMEDIATE MEDICAL ATTENTION.
WAR NI NG
BRAKE FLUID IS HYGROSCOPIC. IF KEPT IN OPENED CONTAINERS IT WILL ABSORB WATER VAPOUR. USE ONLY BRAKE FLUID FROM FRESHLY OPENED
CONTAINERS WHEN TOPPING-UP THE BRAKE FLUID RESERVOIR.
Caution
Brake fluid must not be allowed to contact the vehicle
paint work. Remove spilt brake fluid from the paint work
by rinsing away with running water.
Caution
Always plug pipe ends to prevent ingress of dirt or
moisture into the system.
Fig. 1
A0606127

Brake Actuation System (06.06)
Brake System (06.00)
May 2007 Workshop Manual 6-6-11
11. Loosen and disconnect RH/LH brake tube union from in line connection (see Fig. 2).
12. Release brake tube from clips (x2), remove brake tube.
Installation
1. Install brake tube, connect unions, secure brake tube in clips (x2), torque tighten unions.
2. Install LH/RH front wheel arch liner (see Workshop Manual procedure 01.02.FB/01.02.GB Wheel Arch
Liner - Front - LH - Renew
3. Remove pedal support.
4. Top-up brake fluid.
5. Bleed brake Caliper with assistance.
6. Remove bleed bottle.
7. Install bleed nipple dust caps.
8. Clean off excess fluid.
9. Top-up brake fluid.
10. Install road wheel(s)).
11. Lower vehicle on ramp.
Dynamic Stability Control Module-
Renew
Removal
1. Raise vehicle on ramp.
2. Disconnect vehicle battery.
3. Remove road wheel(s).
4. Remove bleed nipple dust caps.
5. Position bleed container, connect bleed hose to LHR Caliper, open bleed nipples (x1).
6. Position bleed container, connect bleed hose to LHF Caliper, open bleed nipples (x1).
7. Depress brake pedal >60 mm and secure with support.
8. Tighten LHR bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
9. Tighten LHF bleed nipple, disconnect bleed hose, remove bleed container and fit dust cap.
10. Remove LH front wheel arch liner (see Workshop Manual procedure 01.02.FB Wheel Arch Liner - Front -
LH - Renew).
11. Disconnect modulator multiplug.
12. Mark brake pipe unions fo r assembly purposes. Loosen
and disconnect brake pipe un ions (x6) from modulator.
Plug modulator and pipe connections.
13. Remove Torx bolts (x3) securing modulator mounting bracket to body. Remove modulator.
14. Remove Torx bolts (x3) securing modulator to mounting bracket. Collect mounting bracket from modulator.
Installation
1. Install modulator to mounting bracket, install and torque tighten Torx bolts (x3).
2. Install modulator to body, install and torque tighten Torx bolts (x3).
3. Remove plugs. Install and torque tighten brake unions (x6) to modulator.
4. Connect modulator multiplug.
Fig. 2
Repair Operation Time (ROT)
A0606128
WA R N I N G
AVOID SKIN / EYE CONTACT OR INGESTION OF
BRAKE FLUID. IF SKIN OR EYES ARE SPLASHED WITH BRAKE FLUID, RINSE THE AFFECTED AREA
IMMEDIATELY WITH PLENTY OF WATER AND OBTAIN
MEDICAL ATTENTION. IF BRAKE FLUID IS INGESTED, OBTAIN IMMEDIATE MEDICAL ATTENTION.
WA R N I N G
BRAKE FLUID IS HYGROSCOPI C. IF KEPT IN OPENED
CONTAINERS IT WILL ABSORB WATER VAPOUR. USE ONLY BRAKE FLUID FROM FRESHLY OPENED
CONTAINERS WHEN TOPPING-UP THE BRAKE FLUID RESERVOIR.
Caution
Brake fluid must not be allo wed to contact the vehicle
paint work. Remove spilt brake fluid from the paint work
by rinsing away with running water.
Caution
Always plug pipe ends to prevent ingress of dirt or moisture into the system.

Power Brake System (06.07)
Brake System (06.00)6-7-2 Workshop Manual May 2007
Specifications
Maintenance
Brake Booster-RHD-Renew
Removal
1. Remove brake master cylind er (see Workshop Manual
procedure 06.06.EB Brake Master Cylinder Assembly
Renew).
2. Remove oil dipstick.
3. Remove vacuum hose.
4. Disconnect multiplugs (x2).
5. Remove pedal cover.
6. Remove clevis pin and clip.
7. Remove servo securing nuts (x4).
8. Remove servo assembly.
9. Remove brake light switch.
Installation
1. Install brake light switch.
2. Install servo assembly.
3. Install servo retaining nuts (x4) (torque).
4. Install clevis pin and clip.
5. Install pedal cover.
6. Connect multiplugs (x2).
7. Install vacuum hose.
8. Install dipstick. 9. Install brake master cylinder (see Workshop Manual
procedure 06.06.EB Brake Master Cylinder Assembly
Renew).
Brake Booster-LHD-Renew
Removal
1. Move drivers seat fully rearward.
2. Remove clevis pin and clip.
3. Remove booster securing nuts (x4).
4. Remove corner cross brace.
5. Move expansion tank aside for access (bolt x1, nut x1,
hose clips x2, multiplug x1).
6. Remove vacuum hose move aside.
7. Remove bolts (x2) from clutch pipe bracket and move aside.
8. Disconnect clutch reservoir feed pipe.
9. Disconnect multiplugs (x4).
10. Disconnect brake pipes from master cylinder (move aside).
11. Remove booster assembly.
12. Split components.
13. Remove reservoir securing screw (for access to securing nut).
14. Remove master cylinder from booster (nuts x2).
15. Re-fit components.
16. Install master cylinder to booster (nuts x2).
17. Install reservoir securing screw.
Torque Figures
DescriptionNm.lb. / ft.
Brake Booster Mount 21-24 15.5-18
Repair Operation Time (ROT)
Repair Operation Time (ROT)
ItemCode
Brake Booster-Renew 06.07.AC
WAR NI NG
AVOID SKIN / EYE CONTACT OR INGESTION OF
BRAKE FLUID. IF SKIN OR EYES ARE SPLASHED WITH BRAKE FLUID, RINSE THE AFFECTED AREA
IMMEDIATELY WITH PLENTY OF WATER AND OBTAIN MEDICAL ATTENTION. IF BR AKE FLUID IS INGESTED,
OBTAIN IMMEDIATE MEDICAL ATTENTION.
WAR NI NG
BRAKE FLUID IS HYGROSCOPIC. IF KEPT IN OPENED CONTAINERS IT WILL ABSORB WATER VAPOUR. USE
ONLY BRAKE FLUID FROM FRESHLY OPENED
CONTAINERS WHEN TOPPING-UP THE BRAKE FLUID RESERVOIR.
Caution
Brake fluid must not be allowed to contact the vehicle
paint work. Remove spilt brake fluid from the paint work
by rinsing away with running water.
Caution
Always plug pipe ends to prevent ingress of dirt or
moisture into the system.
Caution
Always plug pipe ends to prevent ingress of dirt or
moisture into the system.

Power Brake System (06.07)
Brake System (06.00)
May 2007 Workshop Manual 6-7-3
Installation
1. Install booster assembly.
2. Connect brake pipes to master cylinder.
3. Install bolts (x2) clutch pipe bracket.
4. Connect clutch reservoir feed pipe.
5. Connect multiplugs (x4).
6. Install vacuum hose.
7. Install expansion tank asid e (bolt x1, nut x1, hose clips
x2, multiplug x1).
8. Install corner cross brace (torque) (only fully tighten
when vehicle on level floor).
9. Install servo retaining nuts (x4) (torque).
10. Install clevis pin and clip.
11. Bleed Brakes (see Workshop Manual procedure 06.06.AD Pad Kit - Manual Brake and Clutch Pedal -
Renew).
12. Top-up coolant.
Brake Fluid Reservoir-Renew
Removal
1. Remove corner cross brace.
2. Move expansion tank aside for access (bolt x1, nut x1, hose clips x2, multiplug x1).
3. Disconnect clutch reservoir feed pipe.
4. Disconnect multiplugs (x2). 5. Disconnect brake pipes from master cylinder (move
aside).
6. Remove reservoir holding screw for access to master cylinder retaining nut.
7. Remove master cylinder from booster (nuts x2).
8. Remove reservoir from master cylinder.
Installation
1. Fit new seals and install reservoir to master cylinder.
2. Install master cylinder to booster (nuts x2).
3. Install reservoir holding screw for access to master cylinder retaining nut
4. Connect brake pipes to master cylinder.
5. Connect clutch reservoir feed pipe.
6. Connect multiplugs (x2).
7. Install expansion tank aside (bolt x1, nut x1, hose clips x2, multiplug x1).
8. Install corner cross brace (torque) (only fully tighten
when vehicle on level floor).
9. Bleed Brakes (see Workshop Manual procedure 06.07.DD Brake Hydraulic System - Flush/Refill/Bleed).
10. Top-up coolant.
Brake Bleeding - AMDS
Use the AMDS to bleed the brakes if you are bleeding the
brake system after you replaced a major component, for
example: a modulator or a mast er cylinder or when filling
from empty.
If you are bleeding a caliper, you can use a manual brake-
bleed procedure.
1. Connect the AMDS.
Repair Operation Time (ROT)
Repair Operation Time (ROT)

Power Brake System (06.07)
Brake System (06.00)6-7-4 Workshop Manual May 2007
2. Clean each caliper around the bleed screws. Remove the dust caps.
3. Prepare a bleed tube and a bottle that contains a small quantity of clean brake fluid.
4. If necessary, top up the brake fluid reservoir with brake fluid from a new container.
5. Switch on the AMDS and load the ‘Anti-lock braking diagnostics’ software.
6. Select ‘Brake Bleed’ and follow the AMDS instructions.
Brake Master Cylinder and Vacuum
Booster-Renew
Removal
1. Move drivers seat fully rearward.
2. Remove clevis pin and clip.
3. Remove booster securing nuts (x4).
4. Remove corner cross brace.
5. Move expansion tank aside for access (bolt x1, nut x1,
hose clips x2, multiplug x1).
6. Remove vacuum hose move aside.
7. Remove bolts (x2) from clutch pipe bracket and move aside.
8. Disconnect clutch reservoir feed pipe.
9. Disconnect multiplugs (x4).
10. Disconnect brake pipes from master cylinder (move aside).
11. Remove booster assembly.
Installation
1. Install booster assembly.
2. Connect brake pipes to master cylinder.
3. Install bolts (x2) clutch pipe bracket.
4. Connect clutch reservoir feed pipe.
5. Connect multiplugs (x4).
6. Install vacuum hose.
7. Install expansion tank aside (bolt x1, nut x1, hose clips x2, multiplug x1).
8. Install corner cross brace (torque) (only fully tighten when vehicle on level floor).
9. Install servo retaining nuts (x4) (torque).
10. Install clevis pin and clip.
11. Bleed Brakes (see Workshop Manual procedure 06.07.DD Brake Hydraulic System - Flush/Refill/Bleed).
WA R N I N G
BRAKE FLUID THAT CONTAINS WATER CAN AFFECT THE PERFORMANCE OF THE BRAKES AND CAUSE CORROSION IN THE BRAKE SYSTEM.
IF YOU KEEP BRAKE FLUID IN OPEN CONTAINERS, IT WILL ABSORB WATER VAPOUR.
USE ONLY BRAKE FLUID FROM NEW CONTAINERS
WHEN YOU TOP-UP THE BRAKE FLUID RESERVOIR..
When you bleed a brake caliper, always bleed the inner bleed screw first, followed by the outer bleed screw, then bleed the inne r bleed screw again.
Repair Operation Time (ROT)
WAR NI NG
AVOID SKIN / EYE CONTACT OR INGESTION OF
BRAKE FLUID. IF SKIN OR EYES ARE SPLASHED WITH BRAKE FLUID, RINSE THE AFFECTED AREA
IMMEDIATELY WITH PLENTY OF WATER AND OBTAIN
MEDICAL ATTENTION. IF BR AKE FLUID IS INGESTED,
OBTAIN IMMEDIATE MEDICAL ATTENTION.
WAR NI NG
BRAKE FLUID IS HYGROSCOPIC. IF KEPT IN OPENED CONTAINERS IT WILL ABSORB WATER VAPOUR. USE ONLY BRAKE FLUID FROM FRESHLY OPENED
CONTAINERS WHEN TOPPING-UP THE BRAKE FLUID RESERVOIR.
Caution
Brake fluid must not be allowed to contact the vehicle
paint work. Remove spilt brake fluid from the paint work
by rinsing away with running water.
Caution
Always plug pipe ends to prevent ingress of dirt or
moisture into the system.
Caution
Always plug pipe ends to prevent ingress of dirt or
moisture into the system.

Power Brake System (06.07)
Brake System (06.00)
May 2007 Workshop Manual 6-7-5
12. Top-up coolant.
Brake Master Cylinder-Renew
Removal
1. Remove corner cross brace.
2. Move expansion tank aside for access (bolt x1, nut x1, hose clips x2, multiplug x1).
3. Disconnect clutch reservoir feed pipe.
4. Disconnect multiplugs (x2).
5. Disconnect brake pipes from master cylinder (move aside).
6. Remove reservoir holding screw for access to master cylinder retaining nut.
7. Remove master cylinder from booster (nuts x2).
Installation
1. On new master cylinder - Remove reservoir holding screw for access to master cylinder retaining nut
2. Install master cylinder to booster (nuts x2).
3. Install reservoir holding screw for access to master cylinder retaining nut
4. Connect brake pipes to master cylinder.
5. Connect clutch reservoir feed pipe.
6. Connect multiplugs (x2).
7. Install expansion tank asid e (bolt x1, nut x1, hose clips
x2, multiplug x1). 8. Install corner cross brace
(torque) (only fully tighten
when vehicle on level floor).
9. Bleed Brakes (see Workshop Manual procedure 006.07.DD Brake Hydraulic System - Flush/Refill/
Bleed).
10. Top-up coolant.
Repair Operation Time (ROT)

Anti-lock Braking System (ABS) (06.09)
Brake system (06.00)
Issue 4, November 2008 Workshop Manual 6-9-1
Brake system (06.00)
Anti-lock Braking System (ABS) (06.09)
The anti-lock braking system (ABS) is a four-channel system
having independent inputs from all four-wheel speed
sensors.
The ABS module, monitors signals from the sensors to
calculate, brake slip and the acceleration / deceleration of
individual wheels. When the brake pedal is depressed, and
the ABS module detects incipient wheel lock-up from the
incoming signals, it triggers the re-circulation pump inside
the module’s hydraulic modulator, and the solenoid valves
for the wheel(s) concerned. Brake pressure, is then
modulated to increase / decrease or remain constant at the
wheel(s) concerned until whee l lock-up is eliminated. The
ABS provides self-diagnosis and any malfunction within the
system will be indicated to the dr iver by the illumination of
the brake warning light and ‘ABS FAULT’ displayed in the
message centre right. Should a fault develop within the ABS,
the brake system will operate conventionally and with the
same standard of performanc e as a vehicle not equipped
with ABS.
Dynamic Stability Control
Dynamic Stability Control (DSC ) is a closed-loop system
designed to enhance driving safety by improving vehicle
handling when the tyres are at the limits of their grip
capabilities. This is achieved through instantaneous,
electronically controlled, reduction of engine torque and
strategic application of the brakes at individual wheels.
By using the principle that by controlling the brakes
individually it is possible, to an extent, to steer the vehicle.
This principle can be used to enhance driving safety by
correcting the vehicle’s yaw moment (turning force), when
the vehicle fails to follow th e driver’s steering inputs.
Concept
Satisfactory handling is determined according to whether a
vehicle maintains a path, wh ich accurately reflects the
driver

Anti-lock Braking System (ABS) (06.09)
Brake system (06.00)
6-9-2 Workshop Manual Issue 4, November 2008
difference between the ideal and actual response within a
tolerance band. This directly influences the forces on the
tires to generate a corrective yaw moment to reduce the side
forces of the tires where appropriate
System Overview
The DSC system embraces capabilities far beyond that of
ABS, or ABS and traction control combined, while relying on
the components of these systems. It also incorporates these
additional sensors for measur ing the vehicle’s motion and
brake system pressure:
Ya w r a t e s e n s o r - located centrally on the transmission
tunnel.
Lateral acceleration sensor - integrated with the yaw rate
sensor.
Steering angle sensor - located on the upper steering
column.
Pressure transducer - located on master cylinder.
The ABS / DSC module supports data exchange with other
vehicle electronic systems via the CAN network; the module
also enables diagnostic interrogation using WDS.
The following components register driver demand and the
ABS / DSC module processes their signals as a basis for
defining an ideal response:
PCM - position of accelerator pedal.
Brake master cylinder pressure transducer - driver’s
braking effort.
Steering angle sensor - position of steering wheel.
There are many supplementary parameters also included in
the processing calculations these include the coefficient of
friction and vehicle speed. The ABS / DSC module monitors
these factors based on signals transmitted by the sensors for:
• Wheel speed
• Lateral acceleration
• Brake pressure
• Yaw rate
Using these parameters, the function of the ABS / DSC
module is to determine the current vehicle status based on
the yaw-rate signal and the slip as estimated by the ABS /
DSC module. It then maintains the vehicle response within
a tolerance of the ‘normal’ behaviour, which is easily
controlled by the driver.
In order to generate the desired yaw behaviour the ABS /
DSC module controls the selected wheels using the ABS
hydraulic system and engine control system. In the event of
engine intervention, the ABS / DSC module calculates the
torque which should be supplied by the engine to the
wheels, and relays this request signal to the PCM which
implements the torque request.
The PCM receives signals from the DSC system via the CAN
bus and reduces engine torque as follows:
• The throttle is positioned to provide the requested engine target torque. • During the transient phase of torque reduction caused by
mechanical and combustion delays, other alternative
torque reduction methods are used to provide a quicker
response.
• The ignition is retarded and / or the fuel is cut-off at the injectors at selected cylinders.
• Ignition and fuelling are reinstated when the engine torque reaches the requested value
Operation Summary
• DSC is switched ‘ON’ when the engine is started
• When the system is operating , the DSC light in the instrument cluster will flash, at the rate of twice a second
• DSC can be switched ‘OFF / ON’ by pressing the DSC switch
• The DSC light in the instru ment cluster will illuminate
continuously when the system is switched ‘Off’.
• ‘DSC OFF’ will be displayed in the message centre right to indicate the system has been switched ‘OFF’
• A malfunction in the traction control system will be indicated to the driver by the following:
• The DSC light in the instru ment cluster will illuminate
continuously
• The message ‘DSC NOT AVAILABLE’ will be displayed in the message centre right
• If vehicle speed control is engaged it will automatically disengage when traction control is operating .
Traction Control
Traction control is a function of DSC, and is operated in
association with DSC. Traction control prevents excessive
wheel-spin at standing starts, or during acceleration. Wheel-
spin is usually caused by ex cessive use of the accelerator
pedal, or slippery, loose or bumpy road surfaces. To prevent
excessive wheel-spin and mainta in vehicle stability such
situations are overcome by the intervention of the traction
control system by:
• Braking the driven-wheel when it starts to slip
• And / or adapting the engine torque to a level corresponding to the traction available on the road
surface.
Functional Description
Traction control uses the ABS electronic and mechanical /
hydraulic hardware with additional valves to control the
braking pressure at the calipe rs. An engine interface also
enables the engine to respond to torque reduction requests
from the traction control. As with ABS, the signals from the
wheel-speed sensors are supplied to the ABS module, where
they are used to calculate the wheel-slip of the individual
wheels. Traction control intervention is initiated if the slip at
one of the wheels is excessive.