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1998 GMC Jimmy Question: What is wrong and what is the fix, sometimes when Im braking the pedal gets hard

 

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barry christianson, Mondovi, WI, November 13, 2012, 19:31
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also makes a hydraulic noise and the brakes dont work, when you push really hard they will work again

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  • Answer #1

    pushrod November 13, 2012, 21:04
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     Master

    Check vacuum at brake booster if ok have booster replaced.

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    goodguy, November 13, 2012, 22:56
     Master

    I agree with wetry

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    ziptie12, November 15, 2012, 09:12
     Master

    I agree with goodguy.

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    barry christianson, November 15, 2012, 15:06
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    If I pull the abs fuse the brakes work fine, would it still be the brake booster?

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    pushrod, November 15, 2012, 15:16
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    You didn't mention the ABS light was on! Have the system scanned, lots of sensors, the module, valves ect. it could be.
    There will be codes if you put the fuse back and drive it then scan. Or leave the fuse out but you will no longer
    have anti lock brakes. Most common problem is wheel speed sensor(s) or connections. But not the only one.

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  • Answer #2

    Greg's Orange Auto (12984 Answers) , Orange, CA - (714) 361-9386
    globalhelper November 14, 2012, 06:10
     Master

    sounds like power brake booster is bad

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    barry christianson, November 14, 2012, 14:53
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    where is the brake booster located?

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    pushrod, November 14, 2012, 14:59
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    It is the big black round thing behind the master cylinder. Suggest towing to repair shop!
    I agree with everybody.

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