Question about Ford F-150

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I HAVE A 1999 F150 4X4 WITH 4 WHEEL DISC BRAKES WITH CRUISE. MY BRAKE PEDAL GOES ALL THE WAY TO THE FLOOR WITH VERY LITTLE EFFORT. THE BRAKES DO WORK, BUT DON'T ENGAGE UNTIL OVER HALF WAY DOWN. I JUST HAD TOTALLY NEW BRAKES ( CALIPERS - PADS - ROTORS) AND IT DID NOT MAKE ANY DIFFERENCE. I HAD BETTER BRAKING, BUT PEDAL STILL GOES DOWN. THE MECHANIC RAN OVER A GALLON OF BRAKE FLUID THROUGH, LOOKING FOR AIR OR LEAKS, BUT FOUND NOTHING. WHEN THE TRUCK IS TURNED OFF THE PEDAL IS SOLID FIRM AT THE TOP. COULD IT BE A BAD MASTER CYLINDER?? IF SO, I HEARD THERE WERE TWO SIZES OF CYLINDERS FOR THAT YEAR. IS THERE A DIFFERENCE?? WHAT IS IT???

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  • Kirk Vorbeck Jul 04, 2009

    confirmed what i thought. but are there two different size cylinders for this model?? i know some parts are for 1/99-11/99 and some are for 11/99-12/99.

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  • Master
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ya deffinately this is due to bad master cylinder.. Evantually there are two types of cylinder mainly depinding upon car model on1999. You have to choose your car type cylinder. because to cylinders are slightly differ from one another due differ break models. so first check u r car master cylinder then buy the same.

if any problem come back again

Posted on Jul 04, 2009

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  • Master
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The difference is the cruse. If it has cruse then it has a different vacuum demand. That changes the way that the booster works on the brakes. When the engine is off then it is not producing vacuum and the peddle gets hard to push, therefor seems like it is doing its job. Now to the problem, If the technician has determined that there is no air in the lines and no leaks and the peddle to the half way point before it engages then the master cylinder is bad. They cost between $70 and $100 depending on the parts house. You may be able to save a few bucks if you try a few different salvage yards. They usually give a 30 day warranty on all parts. Hope this helps. Good luck. Please re-post with updates. Thanks cj2176......

Posted on Jul 04, 2009

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