Anti-Lock Braking System (ABS)
Purpose Anti-lock brake systems (ABS) - generally also referred to as anti-lock
systems (ALS) - are designed to prevent the vehicle wheels from locking
as a result of the service brake being applied with too much force, especially
on slippery road surfaces.
The idea is to maintain cornering forces on braked wheels to ensure that
the vehicle or vehicle combination retains its driving stability and manoeuvrability
as far as physically possible. The available power transmission
or grip between tyres and carriageway should also be utilised as
far as possible to minimise the braking distance and maximise vehicle
deceleration.
Why ABS? Although today commercial vehicle brakes are designed to a very high
technical standard, braking on slippery roads often results in potentially
dangerous situations. During full or even partial braking on a slippery
road it may no longer be possible to fully transfer the braking force onto
the road due to the low coefficient of friction (friction coefficient (k)) between
the tyres and the carriageway. The braking force is excessive and
the wheels lock up. Locked wheels no longer provide any grip on the
road and are almost incapable of transferring any cornering forces
(steering and tracking forces). This often has dangerous consequences:
- The vehicle becomes unsteerable
- The vehicle breaks away in spite of countersteering, and starts to
swerve.
- The braking distance is significantly increased
- Tractor-trailer combinations or semitrailer trains may break away or
jackknife.
Load sensing valve influence On dry roads today's load sensing valves (ALB) alone are often capable
of preventing the wheels from locking if the vehicle is unladen; they also
help the driver to effectively grade the braking process on wet road surfaces,
but they are unable to prevent locking as such (no slip monitoring).
In addition, they are unable to counteract any overreactions on the
part of the driver, or any variances in frictional or adhesion coefficients
which may apply to different sides of the vehicle, or indeed to its different
axles (?-split road surfaces).
Benefits of ABS: Only the Anti-Lock Brake System (ABS)
- guarantees stable braking characteristics on all road surfaces.
- maintains steerability and generally reduces the braking distance
- prevents vehicle combinations from jackknifing
- reduces tyre wear.
Limits of ABS Although ABS is an effective safety device, it can not suspend the limits
defined by driving physics. Even a vehicle fitted with ABS will become
uncontrollable if driven too fast around a corner.
So ABS is not a licence for a maladjusted style of driving or failure to observe
the correct safety distance.
4
ABS Training Anti-Slip Regulation (ASR)
Anti-Slip Regulation (ASR)
Why ASR? Increasing the engine output (accelerating) on a slippery road surface
can easily lead to the maximum adhesion on one or all powered wheels
being exceeded causing them to spin, especially if the vehicle is unladen
or partially laden.
Spinning wheels when driving off or accelerating represent a safety risk
just like locked wheel do when braking.
Reasons - Wheels that spin transfer just as little cornering force as locked
wheels.
- They also no longer transfer any tractive power onto the road.
Consequences - Vehicles that do not move or get stuck.
- Vehicles that can no longer be steered, jackknife on uphill uphill
gradients, or swerve in corners.
Benefits of ASR ASR prevents the powered wheel from spinning and provides the following
benefits:
- Tractive power and cornering forces are maintained.
- Stable driving behaviour is ensured when moving off, accelerating
and negotiating corners on slippery roads.
- The indicator lamp (if installed) is used to warn the driver of slippery
road conditions.
- Tyre wear is reduced to a minimum, and the motor vehicle's drive
train protected
- The risk of accidents is further reduced.
ASR and ABS: ASR represents a worthwhile addition to an ABS-controlled braking system.
All that is required to turn ABS control into full ABS/ASR control is
an ECU with the additional ASR function and a few additional components
for controlling the differential brake and the engine. This why ASR
is only available in combination with ABS.
Even a differential lock for off-road use and ASR do not exclude but complement
each other.
Limits of ASR The traction capacity of an all-wheel driven commercial vehicle can not
be achieved by a motor vehicle with only one driving axle - not even with
optimal ASR.
Anti lock brake system light comes up when there is issue with car brake systems.It can be low brake fluid or faulty ABS fuse or its issue with brake system or assembly.Your vehicles brake system needs inspection. http://howtobyme.blogspot.com/2011/11/abs-and-service-light-comes-on.html ------------------- http://howtobyme.blogspot.com/2011/11/abs-light-stays-on-but-brakes-work-fine.html ---------------- http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html ----------------------- http://technoanswers.blogspot.com/2011/11/how-anti-lock-brakes-work.html ------------- http://technoanswers.blogspot.com/2012/01/anti-lock-brake-light-stays-on-all-time.html ------------------- ABS light comes on and Car makes
Grinding noise? http://repairhelpcenter.blogspot.com/2012/01/abs-light-comes-on-and-car-makes.html --------------- http://repairhelpcenter.blogspot.com/2011/11/abs-trouble-codes-for-all-1994-00-acura.html http://technoanswers.blogspot.in/2012/05/2008-toyota-highlander-abs-warning.html -------------- http://technoanswers.blogspot.in/2012/04/2003-lexus-es-vsc-trac-off-abs-lights.html ---------------- http://technoanswers.blogspot.in/2012/04/2008-toyota-highlander-hybrid-warning.html ------------- http://schematicsdiagram.blogspot.com/2011/12/where-is-abstcs-module-located-on-2005.html ------------------ How to replace ABS Modulator Control
Unit on Acura Integra? http://repairhelpcenter.blogspot.in/2011/11/how-to-replace-abs-modulator-control.html ---------------- How to replace ABS Pump Assembly on
Acura Integra? http://repairhelpcenter.blogspot.in/2011/11/how-to-replace-abs-pump-assembly-on.html ----------- How to remove ABS Accumulator on
Acura Integra? http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-abs-accumulator-on-acura.html --------- How to remove ABS Control Unit on
Acura Integra?
To troubleshoot these issue,i suggest you to refer the help links provided below.There are direct links with accurate solution,for these specif issue.
Click the link below and follow the procedure:------
All types of ABS LIGHT / brake problems and repairs
ABS light stays on but brakes work fine?
VCS and ABS lights go on and off
intermittently on Lexus?
http://howtobyme.blogspot.com/2011/11/vcs-and-abs-lights-go-on-and-off.html
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The ABS and Traction
Control Lights stays ON dash of car?
http://schematicsdiagram.blogspot.com/2011/06/abs-and-traction-control-lights-stays.html
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ABS & Brake lights warning indicator
steady on dash and speedometer not working for Dodge Ram?
Battery
Light and ABS Light on Dash
http://whoisbyme.blogspot.in/2012/07/battery-light-and-abs-light-on-dash.html
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Sometimes ABS light comes on while
Driving?
http://howtobyme.blogspot.com/2011/12/sometimes-abs-light-comes-on-while.html
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How Anti-Lock Brakes Work?
Brake System Troubleshooting?
http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html
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Anti-lock brake light stays on all the time?
ABS trouble codes for all models?
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2008 Toyota Highlander: ABS warning light Blinking and OBD Error
codes Coming?
2003 Lexus ES: VSC, TRAC OFF, ABS lights ON?
2008 Toyota Highlander Hybrid: Warning Lights Abs, Vsc & Brake
Are On?
ABS & Brake warning lights remains steady
on dash?
http://schematicsdiagram.blogspot.com/2011/12/abs-brake-warning-lights-remains-steady.html
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Can I drive the car without ABS fuse
connected?
http://schematicsdiagram.blogspot.in/2012/02/can-i-drive-car-without-abs-fuse.html
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Where is ABS/TCS module located on 2005
Cadillac Deville
ABS motor keeps running?
http://schematicsdiagram.blogspot.com/2012/01/abs-motor-keeps-running.html
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When the car stops, abs pump turns ON?
http://howtobyme.blogspot.com/2011/12/when-car-stopsabs-pump-turns-on.html
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Replacing ABS unit on Buick Century?
http://technoanswers.blogspot.in/2012/02/replacing-abs-unit-on-buick-century.html
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2008 Toyota Tacoma: ABS causes Brake pedal fade?
http://technoanswers.blogspot.in/2012/04/2008-toyota-tacoma-abs-causes-brake.html
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Toyota Camry: Premature ABS Actuation?
http://technoanswers.blogspot.in/2012/04/toyota-camry-premature-abs-actuation.html
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http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-abs-control-unit-on-acura.html
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These details will help.
Thanks.
SOURCE: ESP,ABS and brakelights comming on
hello,good day,try to replaced your brake light switch,this switch have 2 function,for brake light and for esp and bas module,ty
SOURCE: ABS, ESP, Level warning lights (2004 Allroad TDI)
I had the brake light switch replaced by a local dealer. Cost was $140 and it fixed the problem. Have driven the car for two weeks since and no lights and all systems normal.
SOURCE: ESP/ABS warning lights illuminates
the abs switch could be going bad or the relay for it could be weak.the relay is under the hood.have it checked taking care of one problem could solve the other
SOURCE: fit new indicator stalk to VW passat esp , abs light on now
the stalk should have no interference with the abs or esp set up what i would look at doing is checking your abs sensors they can go all of a flash...goodluck
SOURCE: focus, esp is not working and the abs and hand brake lights on
Either the system needs servicing or something has gone wrong with the brake system (YOU STILL HAVE REGULAR BRAKE OPERATION THOUGH). Check brake fluid, fuses, and try disconnecting the battery and leaving it for about a half hour. Hope this helps.
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