Having problems with your 1995 BMW 3 Series ?

My abs warrning light is showing on my bmw 316 and does not go out..

Posted / edited by AnonymousUser on : 20-11-2017

Answers :

Anti-Lock Braking System (ABS)
\012Purpose Anti-lock brake systems (ABS) - generally also referred to as anti-lock
\012systems (ALS) - are designed to prevent the vehicle wheels from locking
\012as a result of the service brake being applied with too much force, especially
\012on slippery road surfaces.
\012The idea is to maintain cornering forces on braked wheels to ensure that
\012the vehicle or vehicle combination retains its driving stability and manoeuvrability
\012as far as physically possible. The available power transmission
\012or grip between tyres and carriageway should also be utilised as
\012far as possible to minimise the braking distance and maximise vehicle
\012deceleration.
\012Why ABS? Although today commercial vehicle brakes are designed to a very high
\012technical standard, braking on slippery roads often results in potentially
\012dangerous situations. During full or even partial braking on a slippery
\012road it may no longer be possible to fully transfer the braking force onto
\012the road due to the low coefficient of friction (friction coefficient (k)) between
\012the tyres and the carriageway. The braking force is excessive and
\012the wheels lock up. Locked wheels no longer provide any grip on the
\012road and are almost incapable of transferring any cornering forces
\012(steering and tracking forces). This often has dangerous consequences:
\012- The vehicle becomes unsteerable
\012- The vehicle breaks away in spite of countersteering, and starts to
\012swerve.
\012- The braking distance is significantly increased
\012- Tractor-trailer combinations or semitrailer trains may break away or
\012jackknife.
\012Load sensing valve influence On dry roads today's load sensing valves (ALB) alone are often capable
\012of preventing the wheels from locking if the vehicle is unladen; they also
\012help the driver to effectively grade the braking process on wet road surfaces,
\012but they are unable to prevent locking as such (no slip monitoring).
\012In addition, they are unable to counteract any overreactions on the
\012part of the driver, or any variances in frictional or adhesion coefficients
\012which may apply to different sides of the vehicle, or indeed to its different
\012axles (?-split road surfaces).
\012Benefits of ABS: Only the Anti-Lock Brake System (ABS)
\012- guarantees stable braking characteristics on all road surfaces.
\012- maintains steerability and generally reduces the braking distance
\012- prevents vehicle combinations from jackknifing
\012- reduces tyre wear.
\012Limits of ABS Although ABS is an effective safety device, it can not suspend the limits
\012defined by driving physics. Even a vehicle fitted with ABS will become
\012uncontrollable if driven too fast around a corner.
\012So ABS is not a licence for a maladjusted style of driving or failure to observe
\012the correct safety distance.
\0124
\012ABS Training Anti-Slip Regulation (ASR)
\012Anti-Slip Regulation (ASR)
\012Why ASR? Increasing the engine output (accelerating) on a slippery road surface
\012can easily lead to the maximum adhesion on one or all powered wheels
\012being exceeded causing them to spin, especially if the vehicle is unladen
\012or partially laden.
\012Spinning wheels when driving off or accelerating represent a safety risk
\012just like locked wheel do when braking.
\012Reasons - Wheels that spin transfer just as little cornering force as locked
\012wheels.
\012- They also no longer transfer any tractive power onto the road.
\012Consequences - Vehicles that do not move or get stuck.
\012- Vehicles that can no longer be steered, jackknife on uphill uphill
\012gradients, or swerve in corners.
\012Benefits of ASR ASR prevents the powered wheel from spinning and provides the following
\012benefits:
\012- Tractive power and cornering forces are maintained.
\012- Stable driving behaviour is ensured when moving off, accelerating
\012and negotiating corners on slippery roads.
\012- The indicator lamp (if installed) is used to warn the driver of slippery
\012road conditions.
\012- Tyre wear is reduced to a minimum, and the motor vehicle's drive
\012train protected
\012- The risk of accidents is further reduced.
\012ASR and ABS: ASR represents a worthwhile addition to an ABS-controlled braking system.
\012All that is required to turn ABS control into full ABS/ASR control is
\012an ECU with the additional ASR function and a few additional components
\012for controlling the differential brake and the engine. This why ASR
\012is only available in combination with ABS.
\012Even a differential lock for off-road use and ASR do not exclude but complement
\012each other.
\012Limits of ASR The traction capacity of an all-wheel driven commercial vehicle can not
\012be achieved by a motor vehicle with only one driving axle - not even with
\012optimal ASR.
On vehicles equipped with antilock brakes (ABS), a second warning\015\012light is provided to warn if a problem occurs within the ABS system.\015\012The ABS lamp comes on when the ignition is turned on for a bulb\015\012check, then goes out after the engine starts. If the ABS warning\015\012light remains on or comes on while driving, it indicates a fault\015\012has occurred in the ABS system.

What happens next depends on the nature of the fault. On most\015\012applications, the ABS system disables itself if the ABS warning\015\012light comes on and remains on. This should have no effect on normal\015\012braking. Even so, ABS will NOT be available in an emergency situation\015\012or when braking on a wet or slick surface.

CAUTION: If the brake warning light also comes on and remains\015\012on while the ABS warning light it on, it signals a serious problem.\015\012Your vehicle may not be safe to drive. The brakes and ABS system\015\012should be inspected immediately to determine the nature of the\015\012problem!

If the ABS light comes on momentarily then goes out, the nature\015\012of the problem is usually minor and the ABS system usually remains\015\012fully operational. Some vehicle manufacturers call this kind of\015\012fault a "nonlatching" fault (meaning it isn't serious\015\012enough to disable the ABS system).

Regardless of the type of fault that occurred to trigger the ABS\015\012warning lamp, a special "code" is recorded in the ABS\015\012module's memory to aid in diagnosing the problem. On some vehicles\015\012this code can be retrieved by putting the ABS system into a special\015\012diagnostic mode. The code is then flashed out through the ABS\015\012warning lamp. The code number refers to a diagnostic chart in\015\012a service manual that must be followed to pinpoint the faulty\015\012component. On other applications, a special "scan tool"\015\012must be plugged into the vehicle's diagnostic connector to read\015\012out the fault code.
Repair Help & Product Troubleshooting for 1995 BMW 3 Series

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