Question about 1990 Ford Bronco

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When i push on the brake hard it stays. but when i push on it to slow down the peddle goes all the way to the floor and does not stop. there is no air in the lines. but when i push on the brake there is bubbles coming up in the master cylinder where the brake fluid is stored. what is the problem and how do i fix it?

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Do a brake booster test...pump the brakes 3 times then start the car does the pedal drop??? okay now running pump the pedal three times hold down.. now turn off engine does it drop within 30 sec??? check engine vacuum too booster is good

Posted on May 07, 2009

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THE PROBLEM IS THE MASTER CYLINDER AND YOUR ONLY SOLUTION IS IS TO REPLACE IT, IT'S A COMMON TRAIT.

Posted on May 07, 2009

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THE PROBLEM IS THE MASTER CYLINDER, REPLACE IT, VERY EASY, FOLLOW BLEEDING INSTRUCTIONS THAT COME WITH MASTER.

Posted on May 07, 2009

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Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes).
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