Question about 1985 Audi 5000 S

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Anti lock brakes

Disconnected wheel sensor, brakes no longer drag, but anti lock brake light says "off". but works fine thanks for your help.

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Well looks like one of the sensors are bad i havent priced audi but i know certain parts are pricey be careful cause now brakes are standard and will lock if braking hard

Posted on Jul 21, 2008

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Abs light on , replaced calipers , master cylinder , pads , brakes still drag . So replaced master cylinder again , and again , and again . Now I have no brakes . Oh re did pads also again and again


The ABS system utilizes Sensors at the wheels, some form of modulator (the can release each wheel's brake individually) and a control module (could be part of the car's ECU).
If you're just replacing parts randomly, you will drop a lot of money and time and probably won't cure the actual issue.
Anti lock braking system
How Anti Lock Brakes Work HowStuffWorks

Feb 25, 2015 | 1999 Chevrolet S-10

2 Answers

Anti-lock system light on


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-system-light-vi1ay411tmzjz03ru4fkmxgj-5-0.jpg

anti-lock-system-light-vi1ay411tmzjz03ru4fkmxgj-5-2.jpg

Feb 28, 2012 | 1994 Cadillac DeVille

1 Answer

I have a 2001 jeep grand cherokee laredo. today while i was checking out the anti freeze i notice the abs light came. the suv was running but was not moving. i dove the suv around after the light came and...


You probably have a bad wheel sensor. With the ABS light on the computer is detecting a malfunction in that system somewhere. Its usually caused by a faulty acuator pump or wheel sensor. This won't affect your brakes neccesarilly, however, with the ABS light on it means your anti-lock brake system is not functioning. This means if you hit your brakes too hard it will allow your wheels to lock up.

Oct 03, 2010 | 2001 Jeep Grand Cherokee

2 Answers

Anti lock light , what id mean


The antilock brake system light will go on (ABS) if the sensor in one of the wheels does not detect the correct speed which is essential for the antilock braking system to work properly.

Sep 18, 2010 | 1994 Ford Taurus

2 Answers

Anti lock brake light on brake fluid is fine


You could have a bad wheel speed sensor, or the wiring to it. Also the control unit. I would see what codes are associated with the light, that will pin point the problem, with a fault code. You'll need a code reader.

Mar 16, 2010 | 2001 Oldsmobile Alero

1 Answer

I have a 2002 Lincoln ls . How do I replace the abs speed sensor? Right front tire?


you have one on the inside of each wheel.
SECTION 206-09A: Anti-Lock Control 2002 Lincoln LS Workshop Manual
REMOVAL AND INSTALLATION Front Wheel Speed Sensor
Material Item Specification RTV Silicone Sealant
FSTZ-19G204-AB (Canada CXC-114A) NAVSTR Sealer
Removal and Installation
  1. Raise and support the vehicle. For additional information, refer to Section 100-02 .
  1. Position the inner splash shield aside.
    1. Remove the pin-type retainers.
    1. Position the inner splash shield aside.
  1. Disconnect the anti-lock brake sensor electrical connector.
  1. Remove the anti-lock brake sensor harness from the brake hose clips.
  1. Remove the anti-lock brake sensor.
    1. Remove the anti-lock brake sensor clip.
    1. Remove the anti-lock brake sensor.
  1. NOTE: Make sure the anti-lock brake sensor is fully seated before installation of the new clip.
    To install, reverse the removal procedure.
    • Apply a 2.5 mm (0.1 in) bead of silicone sealant to the outside diameter of the anti-lock brake sensor.
-------------------------------------------------------------------------
Rear Wheel Speed Sensor Removal and Installation
  1. Raise and support the vehicle. For additional information, refer to Section 100-02 .
  1. Disconnect the rear anti-lock brake sensor electrical connector.
  1. Remove the rear anti-lock brake sensor harness from the control arm clips.
  1. NOTE: Clean off dirt and foreign material that may have collected around the rear anti-lock brake sensor before removal.
    Remove the rear anti-lock brake sensor.
    1. Remove the anti-lock brake sensor bolt.
    1. Remove the anti-lock brake sensor.
  1. To install, reverse the removal procedure.

Feb 24, 2010 | 2001 Lincoln LS

4 Answers

Anti- lock light


You have a bad abs sensor the reason it is going on when you move is the computer is trying to read the miles per hour on the wheels one of your sensors is not reading properly. Your regular brakes will work but your abs will not when the light is on. Have autozone check for codes they do this for free:)

Jul 26, 2009 | 2001 Pontiac Aztek

1 Answer

I have a 1998 town and country with traction control and the brakes drag after a few miles most notably the left front(smoke and melt caliper). I have replaced the calipers and rotors twice but this still...


I had a similar problem with my anti-lock brake.
One of the will wear down. I took it to the dealer, could not tell why.
Until one day the a brake light came on. It was a bad sensor. Replace the bad sensor and the problem went away.
The mechanic plug a portable instrument and drive the car around until he find out. (The brake light came on, then off.)
This anti-lock brake system is control by sensors and it one is not functioning properly then you have a problem.
I do hope this help you.

Mar 10, 2009 | 1998 Chrysler Town & Country

1 Answer

Problem with my cruise control and ABS light on 03 Explorer


Anti-Lock Control —Vehicles Built After 03/2002 The 3-channel anti-lock brake system consists of the following components:
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • Anti-lock brake control module (ECU)
  • rear wheel speed sensor
  • rear wheel speed sensor rings
  • yellow anti-lock brake warning indicator
The 4-channel anti-lock brake system with traction control and stability assist system consists of the following components:
  • active brake booster with integral solenoid
  • brake booster release switch
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • stability assist module (ECU)
  • stability assist event indicator
  • lateral accelerometer
  • longitudinal accelerometer (4x4)
  • rear wheel speed sensors
  • rear wheel speed sensor rings
  • steering wheel position sensor
  • yaw rate sensor
  • yellow anti-lock brake warning indicator
  • brake pressure transducer
  • traction control switch
---------------------------------------------------------------------
I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
  • A malfunction in the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system. However, normal power-assisted braking remains.
  • Malfunctions are indicated by the yellow ABS warning indicator in the instrument cluster.
  • The anti-lock brake system is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will carry out a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS warning indicator in the instrument cluster.
  • During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.
  • Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12mph), the anti-lock brake control module turns on the pump motor for approximately one-half second. At this time, a mechanical noise may be heard. This is a normal function of the self-check by the anti-lock brake control module.
  • Pedal pulsation coupled with noise while braking on loose gravel, bumps, wet or snowy roads is normal and indicates correct functioning of the anti-lock brake system.
  • Warning Lamp Indicator
    The anti-lock brake system (ABS) uses the yellow ABS warning indicator to alert the driver of a malfunctions in the ABS.
    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

    -----------------------------------------
    Please report back, I am curious if that is what it is. Good luck

    Mar 03, 2009 | 2003 Ford Explorer

    2 Answers

    Anti lock brake light


    abs relay some times go bad

    Dec 05, 2008 | 1999 Oldsmobile Alero

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