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Abs Brakes abd engages at low speedand occassionally locks up with pedal very high {not low } wheel sensor replaced front drive axle replaced brakesa and calipers good ,,

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  • 6 Answers

I have seen a very slightly loose wheel bearing cause this problem. I would look there.

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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SOURCE: Brakes no longer work in 1989 Chevy half ton pickup 2 wheel drive 350cubic inch

change dump valve under master cylinder

Posted on Aug 17, 2008

  • 422 Answers

SOURCE: 98 caravan no abs

sounds to me if you replaced all of that than the power booster is sticking

Posted on Oct 27, 2008

  • 78 Answers

SOURCE: four wheel won't engage

Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

Posted on Dec 29, 2008

  • 2 Answers

SOURCE: Anti-lock brakes come on just before I stop.

It might be a ALB sensor. Did you check to see if the sensor is operational? Its the cheapest place to check.

Posted on Mar 17, 2009

mecanica03
  • 905 Answers

SOURCE: bleed brakes on 2003 toyota corolla

i try to help you, firts refill brake fluid container,open purge valve in one wheel front only,wait few minutes when drops fluid, close this valve and open other wheel, same procedure, finally repeat this in each 4 wheels

Posted on Jul 14, 2009

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1 Answer

ABS CHECK LIGHT DOESNT COME ON WHEN YOU TURN KEY ON


1. I would not be concerned because if there was a failure in the ABS you would definitely get an ABS warning light and the ABS and most likely the stability control/traction control systems (with added warning lights) will all switch off .

2. You can test if the ABS is operational. On a very quiet damp surface, straight, wide road( with NO other cars around), apply your brakes hard from a very low speed - up to 20 mph ONLY driving in a straight line - until the car stops. The front brakes should attempt to lock up under hard braking and if the ABS is operational you will feel it kick in and the brake pedal will pulsate as the ABS constantly allows brake pressure and then releases it to prevent the wheels from locking up on the damp road. If the ABS does not kick in be ready to release the brake pedal quickly to allow the wheels to rotate so you can steer the car safely. Without the ABS the front wheels should begin to lock up on the damp road surface due to the low level of tire grip. ONLY test this at very low speed and ONLY when driving in a straight line on a straight section of wide road with no other vehicles around.

Dec 15, 2015 | Cars & Trucks

1 Answer

4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Dec 01, 2015 | 2000 Chevrolet S-10

1 Answer

1989 jeep yj 4whl drive not working?


what wheel spins, double posted with this one add small fact.
front or rear.???? spins, gee, must i ask this?
you have open axles, right>? and this is normal
it is !
unless you use Lim.S.D. Axles (an option new)
or drag your brakes, creating a virtual Lim_S_D.
Limited slip differentials. (closed axles)
my 2008 wrangler does that, via software and uses ABS to lock a spinning wheel. (drag it)
but i cant drive on ice free pavement, are you, if yes, stop
PT 4wd is not for that. at all
you need full time,or AWD to do that magic.

got open axles? goggle that.

Feb 19, 2015 | 1989 Jeep Wrangler

1 Answer

Front brakes locking up after driving once it cools off will unlock


Have you checked GM, as well as repair shop data base
Bulletins for those brake issues?

Have you checked with professional scan tool in the
abs module for codes?

Who is replacing those parts & why?

Would seem more like an axle tone ring,wheel hub
tone wheel inside bearing hub,abs module needing to be reflashed
with an update or wheel speed sensors.

Sep 26, 2014 | 2007 Chevrolet Equinox LS

1 Answer

ABS engages without braking


Check all wheel sensors for broken wires, loose connectors or position of sensors in their mounting brackets.

Mar 29, 2017 | Cars & Trucks

1 Answer

Replaced rear brakes for disk breaks on 2006 chevy 1500 lights comes on abs


check to see that the sensor wires that sense axle rotation are connected. Some are near the caliphers abd read the rotor rotation and in my car with rear drum brakes it is in the axle housing next to the axle bearing. Check that the sensor is compatable for the new application

Jan 14, 2013 | 2006 Chevrolet Silverado 1500 2WD

2 Answers

2002 Ford Taurus abs engages on routine stops, brake pedal low and stopping distance seems greater.


Bad abs sensor you can pull the abs fuse under the hood usually large amp fuse 40-60 amp abs wont work put brakes will function better till repaired

Nov 16, 2012 | Ford Cars & Trucks

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

My brakes sometimes go out for no reason. I changed the brakes and the rotors are fine . when im backing up i here this loud grinding noise and my brakes start going down to the floor. what could be wrong.


Your description sounds like a condition called overactive ABS. the grinding nee is the abs pump engaging which will also cause the brake pedal to fade. What is happening is the abs system thinks a wheel is locking up at slow speed even though all the wheels are turning. The abs engages to correct the condition even though there is nothing to correct. Some common failures that will cause this are a bad wheel speed sensor, incorrect wheel speed sensor gap, or a bad exciter ring. The easiest way to figure this out is with a higher end multi-function scan tool capable of reading abs data. With all four wheel speeds displayed drive the vehicle to duplicate the symptom. When the symptom occurs you should be able to see what speed sensor is dropping out. You can then focus on that wheel by checking the common failures. If you have any further questions i'll be happy to answer them.

Sep 08, 2011 | 1995 Honda Odyssey

14 Answers

Equinox brakes (amaurer1@nc.rr.com)


firstly - your symptoms are not directly associated to any brake "failure". The noise is likely related to either a faulty sensor for the abs, the signal/information going to the abs controler is incorrect (not your basic brake function. If your ABS light comes on it is just telling you that the ABS system has been switched off. ABS is there for emergency situations. Your can still has brake function like you had befoore ABS was introduced. You have no need to be concerned as emergency stopping with normal brakes about town would rarely engage ABS. Your dealer "interogates" the ABS controler for fault reports. However, the fault needs to be apparent for this fault report to work. keepit until the ABS light comes on. WITHOUT switching the engine off take it straight to your dealer. switching of may dumpt the fault report so DON'T. Hope this helps.

Mar 29, 2017 | 2008 Chevrolet Equinox

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