Question about 1996 Chevrolet Suburban

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Brake pedal spongy after replacing master cylinder and bleeding the syster

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  • Jeff goddard Feb 08, 2012

    I bench bled the master cylinder and no air is coming out of the bleeder screws. The only thing that comes to mind is the ABS module may have air but the truck has not been run since removing the MC so i wouldnt think that air could have made its way into the dump valves

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  • Chevrolet Master
  • 5,370 Answers

For this problem troubleshooting.Click the link below :----http://repairhelpcenter.blogspot.in/2011/12/spongy-brake-pedal.html
-----------This will help.Thanks.

Posted on Feb 08, 2012

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  • Chevrolet Master
  • 4,336 Answers

There is still air, presuming all brakes are in good shape and adjusted correctly. One issue is master cylinder PRE BLEEDING. If you do not pre bleed the cylinder, you may never get all of the air out. Parts stores sell a kit that has flexible hoses that connect to the brake line connections and submerge the other ends in the MC reservoir, bleed until no bubbles and from that point DO NOT let the fluid get low in the MC, or start over again.
Doc

Posted on Feb 08, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: brakes

Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Posted on Mar 03, 2009

  • 31 Answers

SOURCE: abs light comes on & stays on. no brake one

Your brake pedal needs adjusting! And your brakes need to be replaced! Did the people @ midas look for any air bubbles while they replaced the Master cylinder? Did they get them out? Did they even look at the brakes? All of them?

Posted on Sep 04, 2009

  • 14036 Answers

SOURCE: soft brake pedal after replacing shoes,drums,wheel

YOU STILL HAVE AIR IN BRAKE SYSTEM REBLEED BRAKE SYSTEM.

Posted on Nov 15, 2009

  • 19 Answers

SOURCE: Spongy brake pedal even after ABS bleed and base brake bleed.

Did you adjust the rear shoes out? If the rear drum brakes are out of adjustment they will give you a lot of pedal travel. If the pads are worn have no fear of that U-CLIP brake spring, just change one shoe at a time. Take the spring off one side, change the shoe, put the spring back on the post and do the same to the other shoe, no problem.

Posted on Dec 19, 2009

  • 474 Answers

SOURCE: my 94 c1500 has very

You still have air in the system. You will have to bleed more. I had to bleed a quart of brake fluid out of each wheel to get good brakes on my 1996 GMC.

Posted on Jul 29, 2010

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1 Answer

1997 mercury sable gs 3.0l replaced master brake, still having brake pedal feeling spongy and slowly traveling down. i bench bled master brake and bled brake right rear left rear right then front.


If the master cylinder is replaced, care must be taken to prime the new master cylinder by removing all of the air and completely filling it with brake fluid. The spongy feeling is air that is still in the circuits. You will need to bleed the back brakes as well as the front ones again. The order that you bled them seems correct, but perhaps there remained some air in the main trunk lines.

For the best results 2 people are needed. Start at the further distance wheel cylinder and bleed at least three (3) master cylinder reservoir volumes of fluid (back brakes). Bleed the fluid with use of a piece of tubing attached to the bleed port that is long enough to reach almost to the bottom of a long neck or tall clear jar (clear drink bottle works well). When the bleeding begins, after one or two brake pedal pushes, make sure that the end of the tubing is below the surface of the fluid and keep it under. It best to have a clear bleed line (to observe air). Keep pumping the brake pedal while being careful to not completely empty the master cylinder reservoir (leave 1/4 full always). Repeat the same technique for each wheel cylinder with at least two (2) reservoirs full for front brakes. Partially close the bleed ports when almost finished (at least 5 pedal strokes without exit of any air). Completely close the ports during the down stroke of the brake pedal, with the tubing still attached. Be sure each bleed port is closed snuggly.
Most of the brake fluid can be reused, but not the darker portion at the bottom of the jar.

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1 Answer

Air in the fluid master cylinder


Do you mean the brake master cylinder? As long as the fluid is at the full mark, and you have no air in the brake lines, it is fine. A spongy brake pedal and poor braking operation happens when air is in the lines. Air can get into the lines when the fluid in the master cylinder is very low, almost out, or when a brake line is pulled apart (like when replacing calipers). To get the air out, one has to bleed the brakes-starting at the rear tires-the longest run from the master cylinder-and ending at the driver's wheel -nearest the master cylinder. Opening the bleed valve at each wheel in turn and pumping the brakes will force fluid into the lines and push the air out the bleed valve. When done properly, all the air in the brake lines should be expelled, and the brake pedal returns to it's firm pedal and good braking efficiency.

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try bleeding them more,start with the right rear,then left rear,then right front ,then left front, always bleed the brake that is furthest from the master cylinder, sometimes you have to bleed them several times until you get a steady stream of brake fluid.

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My 94 c1500 has very spongy brakes.I have replaced brake booster,master cylinder,porportion valve and both rear wheel cylinders.brake pedal will get firm when applied too bleed brakes but not much fluid...


You still have air in the system. You will have to bleed more. I had to bleed a quart of brake fluid out of each wheel to get good brakes on my 1996 GMC.

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Spongy brake pedal


could be the master but NOT the booster
the booster increases pedal effort and when it goes you have a HARD pedal

...go to your parts store and ask for a brake booster bleeder kit and bench bleed the master on the car...if the pedal is still spongy then YES its the master

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I have replace wheel cylinder on 97 Stratus, bleed the brake several times, but the brake pedal seems to get more spongy every time I bleed. Could the master cylinder possibly need replace? Is there a...


Itsw very unlikely their is a problem with the master cylinder. When you pump the brake's to bleed them it uses up the vacuum and the brakes will be spungy because the servo isnt working properly. After bleeding leave it running for a few minutes then try the pedal it should be ok. If their is a problem with the master cylinder then the pedal would go all the way to the bottom but not spungy. You may need to bleed the brake on the other side to get all the air out of the system.

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Brake pedal travel gets worse over 6 months and feels spongy. problem recurs again after bleeding the brakes.


Any leakage at the brake wheel cylinders? If so, you must replace leaking wheel cylinders.

More likely is a worn master cylinder. Replacement is necessary. This is not typically a diffucult job, but important to do it right. It sounds like you have the brake bleeding down, and you will need to do this after the master cylinder replacement! Be sure to bleed all 4 corners!

Regards,

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