02 F-250 Super Duty brake peddle goes to the floor - Great Lakes 4x4. The largest offroad forum in the Midwest

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Old July 31st, 2009, 08:04 AM   #1
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Default 02 F-250 Super Duty brake peddle goes to the floor

The brake peddle on my Superduty goes right to the floor, no resistance & no pressure. I replaced a sticking rear passenger caliper a few weeks ago so I rebled that caliper and no change, the fluid just slowly pissed out. My truck has a hydroboost brake system. Im putting bets on the master cylinder has bit the dust. Is this assumption correct, what else could I be overlooking?
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Old July 31st, 2009, 08:17 AM   #2
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how is the steering? Could be a vaccum pump issue too, but it is prob the MC or a leak
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Old July 31st, 2009, 08:30 AM   #3
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how is the steering? Could be a vaccum pump issue too, but it is prob the MC or a leak
steering is still fine.
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Old August 4th, 2009, 09:17 AM   #4
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If you get zero resistance I don't see how it could not be the MC.

On another note

I replaced both front calipers, all four rotors, slide hardware etc and mine is pulsing again like crazy with light pedal at + 40mph on my 02' arggh.
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Old August 4th, 2009, 01:38 PM   #5
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If you get zero resistance I don't see how it could not be the MC.

On another note

I replaced both front calipers, all four rotors, slide hardware etc and mine is pulsing again like crazy with light pedal at + 40mph on my 02' arggh.
it was the master cylinder for me, all fixed now
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