Question about Chevrolet 1500

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Chevy 2001 z71 truck abs light on..... every few times use brake pedal will go 2 floor..not all the time....took tires off brakes look fine pads r fine...fluid is good...not sure what 2 check for..

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  • Master
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You need to check the codes for the ABS system.You probably have a bad sensor.The pads or fluid have nothing to do with the ABS brakes.The problem is usually one of the front hubs.These can be monitored with a scan tool .While driving slow and making turns you will see the mph drop to zero and this is when the pedal will go to the floor.The cause is usually a hair line crack in the reluctor ring in the hub.This is not repairable.The complete hub needs to be replaced.Hope this helps.Good luck.

Posted on Sep 15, 2010

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  • Master
  • 3,092 Answers

If peddle goes to floor, every now and then, and you don't need to keep adding brake fluid, then it's going to be your master cylinder, the master cylinder is by-passing, and that's why you loose brake paddle pressure, needs to be replace or one of these time when you lease expect it, even if you pump the paddle, it is not going to hold pressure and will not have brakes.

Posted on Sep 15, 2010

  • Alexander Mimun
    Alexander Mimun Sep 15, 2010

    You could have two problem's, if ABS light is on, ABS system pick up a code from one of your ABS sensor's, also if light is on, it don't have anything to do with your brake peddle pressure, when light if on ABS is disable, it's like your truck was made with no ABS, but you should still have good braking, just no anti-locking brake, have it scan for the ABS light, get back with us with the code number, so we can help yo diag. your trouble code, master cylinder still needs replacing.

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


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


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

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http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

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http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html

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

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http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html

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

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

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2 Answers

Why is brake warning light is on


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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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
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----------- 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
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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

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

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

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

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

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

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

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

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

---------
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

------------

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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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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My 1997 chevy 1500 z71 brakes suddenly going all the way to the floor. Checked brake fluid and it was low. Could be wheel cylinder? Master cylinder? or ?


well, check the brake lines for leakage after adding brake fluid to the full mark. If the brake pedal goes all the way to the floor, it's likely there is a leak somewhere after the master cylinder. If the pedal gets hard after adding fluid, and pumping it several times with the car off, then the master cylinder is still ok.

If air has gotten into the master cylinder, it may have to be bled out on a bench, or using a scanner if that's the way your vehicle is.

Bleeding the Brake System (ABS) Auto Bleed Procedure NOTE: Perform a manual bleeding procedure. If the brake pedal height and firmness results are not achieved, perform the auto bleed procedure below.
NOTE: Perform this procedure when replacing the brake pressure modulator valve or electro-hydraulic control unit.
  1. Perform the manual brake bleeding procedure. Refer to Bleeding the Brake System (non-ABS).
  2. Check the master cylinder fluid level often to prevent running the system dry.
  3. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure (for Gas engines) once, or the Function Test (for Diesel engines) four times. Make sure to release the brake pedal between each test.
  4. Perform the manual bleed procedure again. This should remove the remaining air from the brake system.
  5. Bleed the system as many times as needed to obtain the appropriate feel of the brake pedal.

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2 Answers

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Hello;
The parking brake cables may be stretched and in need of adjustment. Follow the cables along to a nut. Then you can tighten the adjusters up on both sides until you have the proper tension. Also make certain none of the brackets are bent or broken that the cables ride through.
Thanks;
RPM Northwest

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1 Answer

Service Brake system flashed three seperate times over 24 hours


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(1) I would suggest someone scan the ABS system for codes. I Have an '03 silverado 2500HD Crew cab, and it needs an EBCM (Electronic Brake Control Module) "ABS module". "Service Brake System" message on dash, ABS and Brake warning lamps lit as well. May be the R/F ABS wheel speed sensor, but what you described happen, shouldn't have caused damage to it.
(2) If the aftermarket rim and tire combo are larger than stock (larger overall diameter), then this may affect the way your PCM functions. You can reprogram the PCM to recognize larger diameter running gear so trans shift points and the speedometer and such can function properly.
I hope this helps.

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