Brakes abs light and pulsating brakes

run fault codes
pulsating brakes only occurs under heavy braking when the pulses come from the releasing of the brakes and the reapplication of the brakes by the ABS controller
what you write suggests warped discs and or brake pads worn out
the pulsations could also be from failing wheel bearings allowing the sensor head to touch the rotor on the hub
run the fault codes and have a professional brake specialist shop check the brakes

high speed and heavy braking will produce a pulsation in the pedal
that is the abs working properly and the pulsations are the brake release and reapplying
intermittent abs light indicates a wire or wheel sensor problem at one of the wheels

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.

you could try the abs pump itself try getting one from a breakers yard
hope this helps

does the abs light come on when this occurs? if not it sounds like the brake discs are distorted more than likely the front if abs light comes on it could be abs sensor air gap or reluctor ring failure on one or more wheels

It can be issue with master cylinder or the problem is there is still some air there in the system,that has to be bleed.Or else the parts replaced are not aligned properly/.I suggest everything back.

There are few help links mentioned below to troubleshoot the issue.

Click the link below and follow its procedure:-----

2002 Ford Windstar: Brake Warning Light ON dash?

http://schematicsdiagram.blogspot.in/2012/06/2002-ford-windstar-brake-warning-light.html

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Battery and brake Warning lights on Dash
http://alltypesofpartsreplacing.blogspot.com/2012/10/battery-and-brake-warning-lights-on-dash.html
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ABS & Brake warning lights remains steady on dash? http://schematicsdiagram.blogspot.com/2011/12/abs-brake-warning-lights-remains-steady.html
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Brake warning light comes on and car will not start intermittently? http://repairhelpcenter.blogspot.com/2011/12/brake-warning-light-comes-on-and-car.html
------------ When the car stops, abs pump turns ON? http://howtobyme.blogspot.com/2011/12/when-car-stopsabs-pump-turns-on.html
----------- Where is Power Brake Booster located on 1995 Lincoln Town Car? http://howtobyme.blogspot.com/2011/12/where-is-power-brake-booster-located-on.html
----------- Sometimes ABS light comes on while Driving?

http://howtobyme.blogspot.com/2011/12/sometimes-abs-light-comes-on-while.html
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All types of brake problems and repairs http://howtobyme.blogspot.com/2011/11/abs-and-service-light-comes-on.html

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Brake Fade Issue? http://whoisbyme.blogspot.in/2012/07/brake-fade-issue.html

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Brake System Troubleshooting? http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html

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Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html

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Car Brakes Dragging? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html

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Car Brakes grabbing? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html

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Car Brakes Making Noise? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

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Car Brakes Pulling? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html

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Pulsating Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html

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Spongy brake pedal? http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html

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Hard Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html

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Fading Sinking Brake pedal?

http://whoisbyme.blogspot.in/2012/06/fading-sinking-brake-pedal.html

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Feels Like Brake pedal Pulsating http://repairhelpcenter.blogspot.in/2012/06/feels-like-brake-pedal-pulsating.html

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What is Brake Drum Bar? http://repairhelpcenter.blogspot.in/2012/02/what-is-brake-drum-bar.html

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ABS light stays on but brakes work fine?

http://howtobyme.blogspot.com/2011/11/abs-light-stays-on-but-brakes-work-fine.html

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Vibrations while braking On Chevrolet Van? http://technoanswers.blogspot.in/2012/04/vibrations-while-braking-on-chevrolet.html

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Dragging brakes? http://howtobyme.blogspot.in/2012/03/dragging-brakes.html

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Brake pedal stuck? http://howtobyme.blogspot.in/2012/03/brake-pedal-stuck.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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How to replace Brake Power Booster? http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-brake-power-booster.html

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1997 Chevy Tahoe Brake lights not working? http://technoanswers.blogspot.in/2012/02/1997-chevy-tahoe-brake-lights-not.html

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How to service Drum brakes? http://repairhelpcenter.blogspot.in/2012/02/how-to-service-drum-brakes.html

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What type of problems usually noticed on Drum brakes? http://repairhelpcenter.blogspot.in/2012/02/what-type-of-problems-usually-noticed.html

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How to test Drum Brakes? http://repairhelpcenter.blogspot.in/2012/02/how-to-test-drum-brakes.html

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Brake Bleeder Screw Function? http://repairhelpcenter.blogspot.in/2012/02/brake-bleeder-screw-function.html

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Toyota Tundra: Parts diagram to replace Brake Drums?

http://technoanswers.blogspot.in/2012/06/toyota-tundra-parts-diagram-to-replace.html
---------- Squeak and grinding sound is heard when brakes are applied?

http://technoanswers.blogspot.in/2012/02/squeak-and-grinding-sound-is-heard-when.html

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Brake Pads Inspection on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/brake-pads-inspection-on-acura-integra.html

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How to remove Brake Pads on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-brake-pads-on-acura.html

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How to remove Brake Disc Rotor on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-brake-disc-rotor-on-acura.html

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Brake Caliper OVERHAUL on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/brake-caliper-overhaul-on-acura-integra.html

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How to remove Brake Caliper on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-brake-caliper-on-acura.html

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How to remove Parking Brake shoes on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-parking-brake-shoes-on.html

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How to remove Parking Brake Cable on Acura Integra?

http://repairhelpcenter.blogspot.in/2011/11/how-to-remove-parking-brake-cable-on.html

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Brake pedal is pulsating and vibrating? http://repairhelpcenter.blogspot.com/2012/01/brake-pedal-is-pulsating-and-vibrating.html

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These details will help.

Few latest troubleshooting help links related to these problem.
ABS light stays on but brakes work fine? http://howtobyme.blogspot.com/2011/11/abs-light-stays-on-but-brakes-work-fine.html

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Sometimes ABS light comes on while Driving?

http://howtobyme.blogspot.com/2011/12/sometimes-abs-light-comes-on-while.html

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Brake Fade Issue? http://whoisbyme.blogspot.in/2012/07/brake-fade-issue.html Brake System Troubleshooting? http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html Car Brakes Dragging? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html Car Brakes grabbing? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html Car Brakes Making Noise? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html Car Brakes Pulling? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html Pulsating Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html Spongy brake pedal? http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html Hard Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html Fading Sinking Brake pedal? http://whoisbyme.blogspot.in/2012/06/fading-sinking-brake-pedal.html Brakes make Grinding noise? http://repairhelpcenter.blogspot.in/2012/06/toyota-corolla-brakes-make-grinding.html

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These will help.
thanks.

pulsates ARE normal for this truck it means abs is working.
if truck pulls to the right then the LEFT brake caliber is not working right check to see if rusted up... also install NEW calb. BOLTS never reuse old one if one is bent calb. wont slide correctly

Or you could just pull the fuse for the abs and not have abs but you won't wreck from pulsating pedal.

That is just the ABS system at work. It is supposed to prevent your wheels from locking which often makes the brake pulsate, especially in wet weather or or snow or ice. The only way to really stop this is to disable to ABS by unplugging it and removing the fuse. This will make the ABS light appear in your dash, but your brakes will stop pulsating.