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2007 Chevrolet Cobalt Question: the master brake cylinder needs to replaced so I am being told

 

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tpetkofl, Longwood, FL, August 09, 2013, 07:27
 Rookie

took the car to a local repair shop for vibration in the left rear tire. I was told the rim was bent. not sure how this happened since the car has never been in a wreck. the tech told me that this was happening because the master brake cylinder as bad fluid and it was causing the brakes to engage. I did notice that the brake foot pedal would travel less after driving for a period of time.

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  • Answer #1

    goodguy August 09, 2013, 07:38
     Master

    I have never heard of a master cyl causing a vibration I would take it to get a second opinion

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  • Answer #2

    ebans777 August 09, 2013, 08:12
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     Master

    agree with goodguy and run away from that shop

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  • Answer #3

    pushrod August 09, 2013, 09:44
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     Master

    Actually, mechainc may not be entirely wrong! Especially since you notice a difference in pedal travel. Possible booster, master cyl. brake hose(s) keeping residual pressure on brake system! Overheated rotors warped causing vibration. Have seen it before 'ON A COBALT'!!! You should be able to tell if after the pedal feels harder, travels less, if car seem not to roll freely! If this the case, easy check for this is remove brake booster vacuum hose to see if brakes free now. Let a mechanic do the test! The one i fixed was the booster/master cyl. combo. Check with dealer for any service bulletins.

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    tpetkofl, August 10, 2013, 05:20
     Rookie

    if I just have the fluid replaced. would that help out

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    pushrod, August 10, 2013, 07:20
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     Master

    Can't say for sure but it's not likely! Does it feel as if the brakes are holding without foot on pedal at times?

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    tpetkofl, August 11, 2013, 06:12
     Rookie

    yes but only after I have been driving for a while. sometimes after the car has not been used for a couple of days also.

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    pushrod, August 11, 2013, 06:26
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     Master

    You really need to have a mechanic check this out for you. It's to risky for you to try to diagnose!! I just don't want you to wind up with a NO BRAKES situation! I feel like the booster is most likely the trouble, mechanic can confirm. In any event, do not keep driving it like this, a hell of a lot more damage will result!!!

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