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Hi, I'm from Armenia. Pls, tell me, why while I am driving on a flat road ABS on and brake pedal starts to vibrate

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You did not state what kind of car this is. so i will give you a brief explanation of how the ABS system works on most cars, their is a ABS computer that receives input from wheel sensors, (all four whells have a speed sensor ) and as you step on the brake pedal the computer keeps checking the speed sensors to see if any of them stop turning wile braking if this happens the computer thinks that the sensor that just sent the signal that it stopped turning must have locked up so when the computer sees this it takes over the braking of the car and it will release and reapply the brakes about 100 times a second to keep the car from locking the brakes and skidding out of control. what you are feeling is this system coming on line because it thinks a wheel just locked up, the most common problem when this happens is one of the wheel sensors is going bad.the ABS computer has the ability to remember what caused it to do this and if you can get someone to pull the trouble codes from the ABS computer it will tell you witch sensor is causing the problem.

Posted on Mar 16, 2011

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1 Answer

How do ABS brake systems work on 2004 Rav 4's on icy roads


ABS systems are designed to engage when braking suddenly causing tire skid/spin...the system is designed to pump the brake pedal and the driver should hold the brake pedal down firmly...DO NOT PUMP...the ABS does this for you.

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ABS light comes on and make noise


run diagnostic, check your wheel brg and rotor plate might hav cv grease on it also clean all sensors with brake cleaner

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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

Slam on brakes i feel a vibration in the pedal


This may be a silly response but are you sure it is not your ABS? This is the Anti-lock Braking System that prevents your tires from locking up when you slam on your brakes during an emergency. This helps prevent you from losing control of your vehicle. If any of your tires lock up your ABS will kick in and you will know this when your brake pedal starts to more or less vibrate. Sometimes when this happens your ABS light will come on your dash during the time your ABS is in use. This is a normal response and will happen more frequently when on icy, wet, or unpaved and muddy roads.

May 12, 2011 | 2004 Ford Explorer

4 Answers

Why is my brake pedal vibrating ? I had my brakes fixed and have new tires so what else could be causing the vibration ?


Two possible causes to the pulsing. Lets start with the least expensive first. Warped Rotors. Brake rotors/discs get extremely heated during braking and if you drive in the rain or drive through some standing water at the right time, the Heat and Cool cycle of the braking and then quenching by the water can cause the metal to warp. Even a slight warp will cause some vibration in the front end and a pulsing in the pedal. If the rotors havent been turned during the brake job or replaced I would look here first. The only way to determine is if the wheel is taken off and rotor visibly inspected. Second and most costly is the ABS Control module. Best way to explain is in a small box under your car in the middle by the drivers car door are 6 little plungers... to visualize think suction cups arranged like a 6 pack of coke. When you press your brake peddle in an ABS car these plunger open and close valves to in effect pump your brakes very very rapidly. ABS systems took the old 1970's pump the brakes and automated it. That helped prevent skids when people slammed on brakes during wet weather or accidents. They are controlled by a computer unit called a Control Module (Kelsey ABS Control for GM vehicles) when this starts to go bad you get the pulse in your pedal as the ABS system actuates improperly. Good news is even if the ABS controller goes out you WILL still have brakes, just not ABS brakes. Now lets get to cost. A rotor for your car depending on quality and type runs from 25 to 85 dollars (higher price is for more of a racing/speed type set up with frequent braking not everyday driving.. they are slotted and drilled to dissipate heat faster) Labor at a local mechanic to replace is going to be about $80. The ABS Controller module for your car runs from $745 up to $1100 dollars and the replacement cost is going to be about $200 for labor.

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Hi! My 07 CRV has ABS system. Because in MN


Grinding noise from your brakes means you need to inspect the brakes and change the brake pads. the wise thing to do. Good Luck

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Steering wheel vibration at 65 mpr after I had master brake cylinder replaced. I have to pull off to side of road and stop car then start up again and problem stops. Can feel vibration in brake pedal when...


check balance of tires; if ok, have rotors refinished or replaced; most likely warped rotors if you can feel it in the brake pedal when braking

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1 Answer

Abs comes when brakin on dry roads .


Pedal meant to vibrate when abs is controlling braking on slippery surface otherwise abs unit fault

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1 Answer

ABS problem


IF YOUR WHEELS ARE CLEARING THE GROUND A BRIEF SECOND THE ABS WILL ACTIVATE THE FEELING YOU HAVE IN THE BRAKE PEDAL IS NORMAL

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