Question about 2004 Ford F150

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Break pedal goes to floor with light pedal pressure used during stop and go situations (i.e. in town driving). Hit pedal hard and brakes grab at normal range.

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Hard to say for sure without a visual inspection. Probably an internal/external leak in the master cylinder.
External leak
Open hood and look at brake booster diaphram it should be bone dry if not primary seals are leaking.

Pull off all tires and check all calipers / wheel cylinders (if applicable) for wet spots .
replace rotors , pads and calipers and rubber brake lines wheel cylinders and all their respective hardware( If applicable) that were leaking as well as the same items on the other side that were not leaking. Otherwise braking in the rain will be challenging.
Bleed the system exactly the way the shop manual tells you to.

If the leak was in the master cylinder before removing the master and diaphram with white paint mark the location of the brake pedal push rod bolt. This way you don't have to get involved with resetting the length of the push pedal rosd upon installiation. BE CAREFUL WITH THIS IT CAN CASUE BRAKE DRAG OR A LOW PEDAL IF NOT DONE CORRECTLY. Good Luck

Posted on May 11, 2010

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Renew the master cylinder immediatly ,the seal between the front and rear chambers has failed. This is a dangerous vehicle and shouldnt be used in this condition it WILL FAIL SOON

Posted on May 11, 2010


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