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2007 Kia Rondo Question: REPLACED MASTER CYLINDER, HAVE BLED BRAKES ALL DAY, STILL HAVE A SOFT PEDAL????

 

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JAY313622, 2.7L V6, Clayton, NY, August 16, 2012, 14:43
 Rookie

CUSTOMER HAS BEEN DRIVING VEHICLE WITH SOFT PEDAL FOR A COUPLE OF MONTHS, HE HAS BEEN PUMPING THE BRAKES TO STOP.

BROUGHT VEHICLE INTO SHOP AND CHECKED OVER, PEDAL IS SOFT, IF YOU PUMP IT SEVERAL TIMES, IT HOLDS BREIFLY AND THEN FADES AWAY, THE REAR BRAKES WERE JUNK, THERE WERE CHUNKS OUT OF THE ROTORS, REPLACED REAR BRAKES, THERE ARE NO LINES LEAKING ON VEHICLE, REPLACED THE MASTER CYLINDER WITH A NAPA MASTER CYLINDER.

I HAVE TRIED TO BLEED IT OUT ALL DAY, I HAVE USED MY SNAP ON SCAN TOOL, STILL BLEEDING AND DRIVING, BLEEDING AND DRIVING, ANY HELP WOULD BE APPRECIATED.

2 Answers
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  • Answer #1

    August 16, 2012, 15:20
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     Master

    Time to go to see the doctor. Visit a mechanic to see what you are doing wrong!

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  • Answer #2

    August 16, 2012, 15:45
     Master

    did you bench bleed the master cyl before you installed it

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    JAY313622, August 16, 2012, 16:00
     Rookie

    YES, I DID, AND I'M AN AUTO TECH, I BLED THE BRAKES IN THE SEQUENCE THAT IT SAYS TO DO IT IN, RR, LF, LR, RF, BUT CAN NOT GET THE REAR BRAKES TO BLEED OUT.

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    pushrod, August 16, 2012, 16:50
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     Master

    Sorry i didn't read your profile,with a pinch off tool clamp the flex(rubber) lines closed,
    now try the brake,full pedal? Do this on every line until you find your problem area
    May have to clamp all lines at once.IF you do this test,you WILL find the problem!!!
    Do this on ALL lines even if you think it is something else it works every time.

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    JAY313622, August 16, 2012, 17:06
     Rookie

    OK I DID THIS PROCEDURE AND FOUND THAT THE RIGHT FRONT CALIPER IS THE PROBLEM, AND OF COURSE NOTHING IS OPEN NOW, IN THE MORNING I WILL CALL THE DEALER AND SEE WHAT I CAN FIND, UNITED AUTO SUPPLY AND NAPA DO NOT HAVE ANYTHING AVAILABLE.

    THANKS FOR YOUR HELP.

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    pushrod, August 16, 2012, 17:28
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     Master

    Remember this test cause i don't share it with everyone. Now look closely at
    the RF. caliper and pads make sure everything is installed right. I have seen
    brake pads installed in such a way that they would flex and let the pedal
    travel to much. Check EVERYTHING caliper guide pins ect.Something is
    shifting on the RF brake causing brake pedal to feel spongy.

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    goodguy, August 17, 2012, 00:23
     Master

    good job wetry

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    pushrod, August 17, 2012, 01:21
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     Master

    WE TRY !
    Thanks.

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