Question about 1992 Jaguar XJ6

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Braking System There seems to be a fair few problems with my Sovreign, but this is a big one. When I start the car the anti-lock light, and the ( ! ) light appears. The breaks do not work properly and there is a fairly loud whirring sound which is comming from around the connection to where the brake fluid is pressurized (the big black bulb with the warning). Normally all of these problems will stop after about 10 minutes if i leave the car running, but at times it does not stop at all. This obviously makes the car un-driveable. The worst part is that often when I turn the car off, the whirring sound continues and does not stop. The sound only ever stops when the battery is completely drained or unhooked. Could someone please assist me, the dealers were supposed to fix the same problem 3 months ago and i'm tired of having to unhook the battery every single time i stop the car. HELP!

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The big black sphere is the brake pressure accumulator and it keeps pressure in the system. When the accumulator is bad the pump will continue to run (whirring sound) until it builds up pressure.
You need to replace the sphere first then retest the system.
Before you remove the sphere you must depressurize the system. To do this, make sure the key is off and pump the brake pedal about 50 times.

Posted on Oct 15, 2008

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2 Answers

When braking and almost to a complete stop for some reason the anti lock kicks in. i have to let off and push the pedal again.


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.

when-braking-almost-complete-stop-vi1ay411tmzjz03ru4fkmxgj-5-0.jpg

when-braking-almost-complete-stop-vi1ay411tmzjz03ru4fkmxgj-5-2.jpg

Dec 20, 2010 | 1994 Chevrolet Suburban

1 Answer

Abs light stays on, but brakes still seem to work ok


The ABS warning light means there is a malfunction in the anti lock system on the brakes. This will not affect the conventional braking system on the car which will continue to operate normally.

The car is safe to drive as long as you recognize that it will now be possible to lock up your wheels under hard braking or when braking in slippery conditions where the tires have poor grip.

The problem with the ABS malfunction is that you no longer have an anti -lock assistance on the brake system so in certain conditions, such as on a wet road, you will be able to lock up the wheels on the car when you brake hard. The anti-lock system identifies and retards lock up (by releasing brake pressure on a wheel or wheels) and allows the wheels to keep turning slowly even when you have full pressure being applied on the brake pedal.

The ABS system relies on sensors and if one or more fails you will get an ABS warning. It could be a faulty or dead sensor but it is impossible to say without testing and inspecting the vehicle.

The ABS has it's own fuse so you can check the fuse box in the car to ensure the fuse has not blown. The fuse location is shown in the car's owner's manual. A blown fuse would trigger a warning.

You should take the car to a competent brake specialist to have it checked and the problem rectified.

It's much safer to have the ABS in operation.

Dec 04, 2010 | 2001 Oldsmobile Aurora

4 Answers

What does the abbreviation ABS mean on my Dash Board of a 1996 Nissan Frontier King Cab truck?


It stands for Anti-lock braking system, and the reason the ABS warning light is on is due to a problem with the ABS system

Sep 20, 2010 | 1998 Nissan Frontier

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

What means ABS


ABS means anti lock braking system and if you have a light on for it, then maybe one of the wheel speed sensors is bad or not sending information to the abs brake module.

Aug 19, 2010 | 1991 Mercedes-Benz 560

1 Answer

2004 EXPLORER - ANTI-LOCK LIGHT COMES ON, ANTI- BRAKING SYSTEM DOES NOT WORK. BUT IF YOU SHUT OF TRUCK AND RE-START LIGHT GOES OFF AND BRAKES WORK UNTIL THE LIGHT COMES BAKE ON A FEW MINUTES INTO...


there is a problem in the system . and you have to reset the computer to make it work. you know this .check all brake pads, if they are good you have to it read at a shop. good luck

Feb 25, 2010 | 2004 Ford Explorer Sport Trac

2 Answers

Whot is an anti lock and where do i find it and how it repaired.? when comming to a stop the brakes seem to pulsate.


you need to take your car in to a reputable brake shop. Your rotors are likely warped causing some pulsating. The anti-lock is an automatic function that helps keep wheels from locking up under hard braking. If your ABS/Anti-Lock light is on, definitely take it to get inspected.

Nov 12, 2009 | 2005 Buick LaCrosse

2 Answers

ABS light appeared on dash for a few seconds before going out. What does ABS light mena?


ABS stands for Anti-Lock Braking system. The system could be triggered if you are on wet pavement or sliding and the brakes cannot properly control the vehicle deceleration. The vehicle could also have a fault in the ABS system due to a wheel sensor that is corroded or damaged. This type of problem is best left to an expert as the ABS system can be very expensive to repair.

May 21, 2009 | 2000 Volkswagen Jetta TDI

1 Answer

Anti-lock light comes on.


I had the same problem on my 2000 Blazer usually when I made a slow turn. I had the ABS system disconnected, you don't need it here in NY, problem solved. You won't notice any braking change except on snow and ice you'll get normal braking not the ABS back and forth. It took just a few minutes and the mechanic didn't charge me. The light will stay on but it still passes inspection. Hope this helps.

Mar 26, 2009 | 1993 Oldsmobile Cutlass Supreme

1 Answer

Anti lock


That light is letting you know that there has been an Event that Required the Anti-Lock Braking System to Activate. It should have gone out after a few Min. I would get the Brakes Checked out.

Jan 04, 2009 | 1992 Saturn SL

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