95 f150 brake problem

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Old 12-15-13, 10:29 PM
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95 f150 brake problem

So I just replaced all the brake lines on my truck, I've bleed them out and everything. they pump up good when the trucks not running. Then when you start it the pedal goes to the floor like there's no pressure. I have no leaks anywhere can't figure it out.
 
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Old 12-16-13, 04:22 AM
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Are you sure you bled them well?
 
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Old 12-16-13, 04:30 AM
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AND the master cylinder.
 
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Old 12-16-13, 09:53 PM
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is that all you replaced, was the metal tube brake lines?
nothing replaced in the drums etc?
& the brakes Did work, Before your work ?
 
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Old 12-17-13, 11:13 PM
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Yes the brakes worked fine before my work. I replaced the hard line feeding the front brakes because the old one busted (rusted out) I will try and bleed them out better. Didn't do any work to the drums or master cylinder.
 
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Old 12-18-13, 01:49 AM
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Should I bleed them with the truck running or does it matter?
 
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Old 12-18-13, 03:54 AM
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Shouldn't make any difference although it might be easier for your helper to pump the brakes with the engine running.
 
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Old 12-20-13, 07:51 PM
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the brake proportioning/isolation- valve has probably 'tripped'.
it will trip, when there is a hydraulic failure in one of the fluid circuits ( ft, or rear)
& it turns the red brake lite On.
(is the red brake lite On?)

it will need to be reset.

I do it with the engine 'off', but you 'may' need it running 'if 'you cannot get it to move without the engine running.

Loosen the brake line fitting at the master cylinder for the rear brakes ( the small chamber) about 1/2 turn.
slowly press the brake pedal, considerable force may be needed, once it goes almost to the floor, keep pushing, & listen for an audible 'click/pop' this is when the shuttle valve (inside the isolation valve) goes to the other side.

stop pushing immediately when you hear the click, tighten the loosened fitting.

see if this works for you?
 
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