Question about 1989 Mazda MX-6

1 Answer

Brakes wont come up

I have replaced left caliper, master cyl. Bench bled master perfectly. No bubbles. Have spent 3 hours going from wheel to wheel bleeding. Wifes leg is gettin really tired. I get the same result every time. Pedal goes about an inch or so from the floor then has good resistance. Like I said I have gravity bled the brakes then spent hours pumping and bleeding. Always the same result. Feels halfway decent with car shut off, but as soon as I start car pedal goes almost to the floor. With the car running you still cannot pump up the pedal. It will stop the car fine but I don't like the having the pedal travel that far before it stops. Can a proportioning valve cause that? Can I be getting air in lines without leaking fluid in the process? If so how?

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  • 2 more comments 
  • pk29still Apr 13, 2009

    big difference, as in. the pedal hits the floor? should the idle change drastically also?

  • pk29still Apr 14, 2009

    I just went out and pulled vacuum line from booster and car stalled. I
    guess I can plug the vacuum line and restart car and test brakes?
    Can car be driven without the help of the booster?

  • yadayada
    yadayada May 11, 2010

    suggest u use Live Chat for this involved problem.

  • Anonymous Mar 19, 2014

    Pedal still goes down

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Sounds like a bad diaphragm in your brake booster. listen for air while running at booster , disconnect vacuum hose depress pedal if it is good there should be a big difference in pedal

Posted on Apr 13, 2009

  • james shack Apr 13, 2009

    yes probably vacuum leak inside booster replace booster

  • james shack Apr 14, 2009

    no no

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