Question about 2006 Chevrolet Cobalt

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Only air coming out when bleeding a 2006 chevrolet cobalt ls.

What can cause only air coming out when bleeding a 2006 Chevrolet Cobalt LS? Could it be the Master Cylinder (Brake System)? How can I tell if it needs replaced?

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Need to know what was done to need to bleed the brakes. Easiest way to bleed a brake system is the gravity bleed. Crack open all 4 bleeder screws a little, open your cap on the master cylinder, and wait. Make sure to keep plenty fluid in the master cylinder while doing this. After about 30 min or so you should have pure brake fluid coming out of all 4 bleeder screws. If you have one that does not have fluid coming out, tighten the others and open the one up more until fluid comes out. After all four wheels have fluid it is still a good idea to have a buddy help you bleed them once the old fashion way by pumping up the brakes, hold the pedal and crack open each beeder one at a time.

Posted on Mar 18, 2014

  • Dennis Adelmeyer Mar 18, 2014

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  • Dennis Adelmeyer Mar 18, 2014

    Make sure you have brake fluid in the master cylinder. Then jack up the wheel furthest from the master cylinder. remove wheel and open bleeder screw and have someone push on the pedal. Keep pumping on the pedal until you have a steady stream of fluid. Close the bleeder screw as someone is pumping on brake so you don\'t suck more air into the system. Do this with each wheel. If you can\'t get anything to come out of the front wheel bleeders, you may have a frayed brake hose. Hoses can look good on the outside but that doesn\'t mean they\'re good on the inside. Replace brake hose if you can\'t get fluid out of bleeder. Hope this helps

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SOURCE: how do I replace my 2006 Chevrolet Cobalt Brakes

first loosen the road wheel nuts. then jack it up. then remove the road wheel. then turn the wheel out (brake side) get a g clamp put one end on the caliber and the other on the outside pad and wind nice and slowly then remove the two bolts holding the caliber and put aside DONOT TOUCH THE BLEEDING NIPPLE OR REMOVE ANY OF THE RUBBER HOSES ON THE BRAKE LINES open the reserveor (BRAKE FLUID CAP) the disk (rotor) look for a retaing screw on it and remove it some cars havem some dont then tap the disk off asemably is the reverse of removel

Posted on Jul 08, 2009

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SOURCE: where to put steering fluit in the cobalt ls 2006

There is no place. The Cobalt has an electric power steering system. There is a bad problem with this car. My nephew had problems and when checking found out that there are way too many problems with this system. The entire steering column assembly has to be replaced. There is no recall issued on this for the Cobalt, but I heard that there was a similar issue recall for the Malibu. Hope this helps. I feel your pain!!

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SOURCE: where is the idle air control valve on a 2006 cobalt

Follow your air intake boot to your throttle body, your Idle Air Control will be the sensor with two torx bits ussually 20 bit. It is the sensor with the longer flat electrical connector the one beside it with the round pushi in plug is your tps.

Posted on Nov 21, 2012

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1 Answer

Rear brakes wont bleed


It is important to fully "bench bleed" the Master cylinder as air can get trapped in the body of the cylinder. DO not block off the ports and bleed , attach 4 bleeding adapters & hoses to the MC and bench bleed till you get no air. the you can install & bleed R/R wheel , then L/R wheel , then R/F wheel , finishing with the L/F wheel. when bleeding don't pump the pedal as that will aerate the fluid & make it harder.

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How do I check the oil level in slave cylinder for the clutch on 2006 chevy cobalt


First off, clutch hydraulics use ONLY dot 3/4 brake fluid, if you used any kind of petroleum product you have ruined the clutch master cylinder and clutch slave/actuator(GM's term)cylinder. The level is on the side of the reservoir. If you had to add fluid, you have a leak in the system, probably the slave cylinder first. A master cylinder leak would have fluid on the inside of the firewall, where the master cylinder is mounted(leaking at the back). You bleed clutch hydraulics as you would with brakes.

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If the pedal isn't coming all the way back it may be caused by a couple of problems. If your brakes are working properly, you can assume that the Master Cylinder is functioning normal. It is possible you have stretched the return spring on the pedal itself, or there might still be air trapped in one of the brake lines. However, if there was air, you would have a very mushy feeling still in the brake pedal. So it is unlikely.

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first did you perform a bench bleed on the master cylinder? if not bench bleed the master cylinder. had a neighbor with a similar problem with a ford truck. did some reaserch and found the ABS system needed to be bled. one way to bleed air out of it is to connect the diagnostic computer and perform an ABS bleed and then bleed the brakes like you normaly would. The other way was to take the vehicle somewhere you can slide around safely and slam on the brakes causing the ABS to activate. do this a few times and then perform the normal bleed method.

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Just because the master is new does not mean it isn't faulty. If you are certain you have bleed all the air from the system, I suspect you got a bad master.

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I change my master cylinder for my brakes and now I have no brakes what could be my problem to that


you must have a lot of air in system. the brakes need bleed to let the air out of system. did you bench bleed the master cylinder before putting it on car ! if not thats why no brakes. to bench bleed a new master cylinder, put it in a vise. fill it full or the proper level of brake fluid. push on the plunger with a dowel or another object. pump it till all air is out of master cylinder, you can tell when no air. it will be all fluid coming out of cylinder. keep checking brake fluid in master cylinder.make sure you push plunger in all the way.when all air is gone replace on car. if you do not loose any fluid from the master cylinder lines, then you can replace it without having air in system. bleed each wheel if needed. good-day!

Jul 10, 2011 | 2006 Chevrolet Impala

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I went to start my car today and pushed the clutch in and it went straight to the floor on my 06 chevy cobalt ls. Can you help?


Check the fluid for the clutch. It has a small master cylinder next to the brake master cylinder. It should use brake fluid. If it is low, top it off. If it goes low again, you'll need to investigate where it's leaking from. You could have a leaking master or slave cylinder.

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How do i bleed the brakes on a 1999 Pontiac Grand Am?


Bleeding the Brake System
When any part of the hydraulic system has been disconnected for repair or
replacement, air may get into the lines and cause spongy pedal action (because
air can be compressed and brake fluid cannot). To correct this condition, it is
necessary to bleed the hydraulic system so to be sure all air is purged.

When bleeding the brake system, bleed one brake cylinder at a time, beginning
at the cylinder with the longest hydraulic line (farthest from the master
cylinder) first. ALWAYS Keep the master cylinder reservoir filled with brake
fluid during the bleeding operation. Never use brake fluid that has been drained
from the hydraulic system, no matter how clean it is.

The primary and secondary hydraulic brake systems are separate and are bled
independently. During the bleeding operation, do not allow the reservoir to run
dry. Keep the master cylinder reservoir filled with brake fluid.


  1. Clean all dirt from around the master cylinder fill cap, remove the cap and
    fill the master cylinder with brake fluid until the level is within 1/4 I n.
    (6mm) of the top edge of the reservoir.
  2. Clean the bleeder screws at all 4 wheels. The bleeder screws are located on
    the top of the brake calipers.
  3. Attach a length of rubber hose over the bleeder screw and place the other
    end of the hose in a glass jar, submerged in brake fluid.
  4. Starting at the right rear proceed in this order left front, left rear and
    right front.
  5. Open the bleeder screw 1/2 - 3/4 turn. Have an assistant slowly depress the
    brake pedal.
  6. Close the bleeder screw and tell your assistant to allow the brake pedal to
    return slowly. Continue this process to purge all air from the system.
  7. When bubbles cease to appear at the end of the bleeder hose, close the
    bleeder screw and remove the hose.
  8. Check the master cylinder fluid level and add fluid accordingly. Do this
    after bleeding each wheel.
  9. Fill the master cylinder reservoir to the proper level.


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2 Answers

Can not get a pedal, replaced master cylinder twice, bled everything, no pedal...can't seem to get fluid out of the 3 front ports on the master cylinder...could both master cylinders be defective, or am I...


Did you bleed the master cylinder before you put it in the vehicle?This usually makes it easier to bleed the entire brake system if this is done before you install the master cylinder.Other wise all you have done is put air in the brake system.The master cylinder kit usually comes with a bleeder kit.This is for bench bleeding the master.Hope this helps.Good luck.

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How do you bleed brake system


I perfer using an asistant, start at the wheel that is furtherest from the master cylinder, end with the wheel closest to the master cylinder. have assistant push the brake pedal down and hold it, you open the bleeder screw and watch the fluid coming out, when it slows close the bleeder, then tell assistant to release the brake pedal, then repeat as necessary until all air is removed. keep a check on fluid level in the master cylinder, if it goes empty you will introduce air into the system. hope this helps.

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