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Chevrolet Cobalt Brake Problems

When first starting the car the brake pedal goes 3/4 to the floor the first push. Then it is fine. (about 2/3 travel. Then after a few miles the pedal travel starts to shrink. Goes to 1/2 then to a 1/4 till finally it's right at the top and touchy as hell. (not even enough travel to have the brake lights come on) The car actually won't roll. If you turn it off and wait 10 minutes....start the car and the cycle starts again.

It actually started to lock up on the expressway and I had to pull over and wait till it unlocked.

Now this happens 50% of the time. Chevy drives it and it does not happen. They don't drive it long enough. To me in my limited dealings with anti lock and such it sure sounds like a master.

Car has 2000 mi on it.

We are dropping it off Monday to try again.....

Ideas???
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Comments

  • ray_h1ray_h1 Posts: 1,134
    The accumulator circuit? I presume you've already checked the fluid level in the master cylinder reservoir. (Whenever I can't get the dealership off its fat duff, I go to another dealership. They're not all created equal.)
  • Just wondering if anyone has had problems with the brakes pulling when doing a hard stop.

    I bought a base model 2007 Cobalt LS and had to do my first hard stop after 6500miles. A Corvette spun out in front of me on the interstate (why I don't know, it was dry...) and I hit the brakes really hard to try to stop. The car pulled left and I hit the wall (missed the corvette...). I do not have ABS. The road curved to the left so I was thinking that if the brakes just locked up it should've travelled to the right side of the road, not further left.

    Has anyone else experienced pulling of any kind? Obviously this was a hard pull. Does anyone know if there would be a ny physical evidence of the pull or am I stuck taking the wrap for this one??
  • times2times2 Posts: 45
    I did have to brake hard once, and did not have that problem (2006 LS Sedan). But if your tire pressure was uneven, pushing the weight down on the front end during a hard stop would make the car turn to the side with the softer tire. You might want to check that.
  • I just rented a new 2007 cobalt with 13000 miles and was going 50 kil an hour when a car cut me off i jammed on the breaks and nothing no skidding a quarter of a second very light squeel (tires) and 4 seconds or 100 freet later i smaked the back of three cars jammed together in the passing lane with on traffic or turn lane or x walk for miles.. duuuuu anyone else had breaks not work I pushed mine to the floor AND BROKE MY TOE
  • I just rented a new 2007 cobalt with 13000 miles and was going 50 kil an hour when a car cut me off i jammed on the breaks and nothing no skidding a quarter of a second very light squeel (tires) and 4 seconds or 100 freet later i smaked the back of three cars jammed together in the passing lane with NOtraffic or turn lane or x walk for miles.. duuuuu anyone else had breaks not work I pushed mine to the floor AND BROKE MY TOE
  • cmhj2000cmhj2000 Posts: 191
    Sorry to hear about your toe.

    Don't know of any issues like you described. GEZ
  • rnarmarnarma Posts: 1
    I just spent a week with a Base Cobalt rented from Hertz. Long ago I learned to do a brief test of a cars' braking and handling BEFORE going on a long trip. I was taught these skills during various SCCA Autocross and Road Racing schools. My rented Cobalt had 8000 miles on the clock and was NOT equipped with ABS. If I had it to do over, I would not rent this model vehicle again unless equipped with ABS. The front/rear braking balance resulted in very early lockup of the rear wheels which resulted in loss of directional control when even braking hard in a turn. The overall braking was poor as a result. I notified Hertz of the problem in my post rental survey. This was not a problem in normal driving but could present a danger to an inexperienced driver in a panic stop situation. I have rated the non-ABS Cobalt as an unacceptable choice for friends and family. This is a shame as I am a very happy C6 Corvette owner and was otherwise pleased with the Cobalts ride, mileage and handling.
  • okko1okko1 Posts: 327
    yeah right like i believe that. :P
  • poncho167poncho167 Posts: 1,178
    If you supposedly went to a racing school and have driven cars on the road then it shouldn't matter what kind of braking system a car/truck has. I have never heard of someone who couldn't drive a non-ABS equipt car. I have driven both and currently drive a non-ABS p/u truck on a regular basis. A good driver can drive anything safely.
  • maryw3maryw3 Posts: 1
    I have a 2006 Cobalt Sedan and have had my brakes lock up twice. The first time was just about a year ago on a perfectly dry level road. I hit my brakes to avoid a car running a stop sign and went into a total 360 spin, crossed 3 lanes of oncoming traffic and came to a stop (finally) on an embankment facing the totally opposite direction I was going. Fortunately I didn't anything or anyone but I did flat spot all 4 tires. The dealer couldn't find any brake problems.
    Yesterday under similar road conditions my brakes again locked up and pull hard left. Not as fortunate this time. I was hit by an oncoming car (no injuries, thank God) and will be without a car for 7 to 10 days for repair. Again the dealer found no problems.
    I don't have ABS either.
  • poncho167poncho167 Posts: 1,178
    Ok, well that is slightly different from the other poster. He made it sound like non-ABS cars were just safety hazzards but yours definately sounds like an issue. Normally these lock up issues are related to ABS. I would think there is probably something wrong with the brakes master cylinder.
  • Is there anyone of you have a brochure for Cobalt 2007 LT that indicates if the ABS is optional or standard. Because I buy my Cobalt 2007 LT last November 2007 and I thought that ABS is already included. I just want to verify.

    Thanks,
  • I own a 2008 Chevy Cobalt LT Sedan.... W/O the Abs Feature.... the car has just under 10,000 miles on it. Since the car had 4000 miles on it i've been hearing obnoxious squealing noises from my brakes. During the past year i've also had the brakes lock up 3 time, two of which were sunny dry days, one time the roads were wet....
    I just had the car serviced for the 6th time again today they've found no problem... and the service manager stated: that I might just have to live with it, and GM will do nothing to resolve the problem, If anyone is having similar problems let me know... :mad:
  • I have a 2007 Cobalt and the brake fluid is getting low. What kind of brake fluid should I use? Regular DOT 3 or Synthetic?
  • poncho167poncho167 Posts: 1,178
    Go with what it says in your manual or consult a dealer for their opinion. I am sure you know that if you switch you will need to flush the whole system.
  • I called Prestone. The stores around us only carry synthetic and not the regular brake fluid. Prestone said that we could mix both the regular and synthetic. The original fluid is synthetic and that they started putting synthetic on the bottles.

    The number I called was 1-800-890-2075. The guy I talked to was named Roger.
  • Problem: 2005 Cobalt, no ABS, manual transmission - car would always spin around in event of medium to hard braking. Solution: Finally found a good GM mechanic who didn't assume I was a wacko. He says before rear automatic brake adjusters can do their job, emergency (parking brake) MUST be set when parked. Apparently, when the parking brake is set, the cable activates a small pin which allows the self-adjusters to work. Owner's manual does not say anything about this - it just says use parking brake each time - not why. Until now, we religiously DID NOT use the parking brake, because the salt from our winter roads can cause them to freeze up if applied.

    For those who don't know, rear brakes on cars with rear drums are usually designed to self-adjust as the driver backs up and applies brakes lightly. That is such a common scenario that no one has to be instructed about it. The e-brake thing, not so common. My car was braking like a bicycle when you only use the front brake. The back end would whip around causing a spin. Now I can stop straight with all 4 wheels braking evenly. This is a very important issue! I will re-post this under a new heading so people don't miss it. Wish I knew a better way to get the word out.
  • Problem: 2005 Cobalt, no ABS, manual transmission - car would always spin around in event of medium to hard braking. Solution: Finally found a good GM mechanic who didn't assume I was a wacko. He says before rear automatic brake adjusters can do their job, emergency (parking brake) MUST be set when parked. Apparently, when the parking brake is set, the cable activates a small pin which allows the self-adjusters to work. Owner's manual does not say anything about this - it just says use parking brake each time - not why. Until now, we religiously DID NOT use the parking brake, because the salt from our winter roads can cause them to freeze up if applied.

    For those who don't know, rear brakes on cars with rear drums usually designed to self-adjust as the driver backs up and applies brakes lightly. That is such a common scenario that no one has to be instructed about it. The e-brake thing, not so common. My car was braking like a bicycle when you only use the front brake. The back end would whip around causing a spin. Now I can skid straight. This is a very important issue! I will re-post this under a new heading so people don't miss it. Wish I knew a better way to get the word out.
  • tcaloftcalof Posts: 29
    The parking brake SHOULD be applied regularly so that salt from the winter roads does NOT cause the emergency brake cable to freeze up.
  • poncho167poncho167 Posts: 1,178
    I have always used the emergency brake when parking my manual transmission vehicles. Being a big car buff I knew that it was good for the brake adjustments and cables.
  • My car is doing the same thing. I have taken it to the dealership over a dozen times and they think I am crazy. The car brakes by itself!!!!!!!! Something has got to be done about all of this. It's sad but even worse, now I am stuck with a car payment on a car that I can't drive.
  • Thanks so much for posting this. I had to brake this morning at 65 MPH and spun out, ended up facing the wrong way on the freeway and covered 3 lanes. I'm so lucky no one hit me.
  • I have had the same problem with a 2005-almost got rear-ended by a huge truck last week
  • keep4kidkeep4kid Posts: 1
    ...got in the car this morning to move it after about a month under snow in PA. Put in "drive"...released parking brake and the rear wheels locked. After numerous attempts; problem continued. Any suggestions?
  • I am sorry if this to you is a stupid question but i have an automatic that gives me fits with the rear brakes. Will applying the parking brake work to fix my braking issues as well or is there a different procedure for automatics? Any help is greatly appreciated. Thank you.
  • gmcustsvcgmcustsvc Posts: 4,134
    billybobbigred,
    I would recommend taking your vehicle in to your dealer of choice. They will be able to double check your breaks and address your concern. Please keep me updated on your progress.
    Christina
    GM Customer Service
  • jypseejypsee Posts: 2
    this just happened to my mother
    brakes failed
    dealership where bought and repaired WILL NOT RELEASE CAR UNTIL A GM CERTIFIED MECH COMES TO DEALERSHIP
    GM CONTACTED DEALERSHIP
    DEALERSHIP WILL NOT CORPORATE WITH GM

    HELP ME
    JYPSEE
  • jypseejypsee Posts: 2
    GETTING THE RUNAROUND BY
    LOCAL DEALER----THEY WONT TOUCH IT AFRAID OF "PRODUCT LIABILITY ISSUE"
    GM (as required by dealership that sold it, maintained it, fixed it- told me i had to file a complaint directly to GM they the dealership, THEY CAN'T AND WOULD NOT CONTACT GM FOR MY MOM)
    WAITING FOR GM EXPERT FOR 6 WEEKS
    SOMETHING STINKS OF ALL KINDS OF BS
    A LITTLE LIKE TOYOTA IN MY OPINION

    ANYBODY????
    PLEASE!!!!
  • I own a 2005 Cobalt and just had total brake failure with my ABS and Traction-control (T/C) dash lites coming on...Could you please tell me what your final outcome was?
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