Question about 1992 Ford F250

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95 F250 Diesel.Vacuum assist Brake Master Cylinder, pedal goes to the floor, only when the engine is running. I've change the MC 5 times in a row. Bench bleed,installed brass plugs,then install on booster while leaving brass plugs in. Eng off/pedal is high and hard. Eng on/idling/ pedal drifts to the floor. No external leaks. please help.

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You may have to bleed your abs sys. this is best done with a computer

Posted on Sep 12, 2009

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I would go with not bled correctly

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Brake pedal problem


I'd bet you dollars against donuts that when the new MC was installed it was left with air in the lines. Bleed the brake lines to get that air out of there, and I suspect your brakes will firm up nicely.


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