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Old 01-30-2010, 06:40 PM
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1977 f250 brakebooster problems

I just replaced the master cylinder and the brake booster, bleed the system out. But when i hook up the vacuum line and drive off the pedal sticks down i can pull it back with my foot but as drive further it like the brakes engage by themselves. And as soon as you let off the gas you stop dead, but if i disconnect the vacuum line & block it off the pedal is a little hard but breaks work fine. Can someone please help? The parts store i bought it from says it the right one for my truck.

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Old 01-30-2010, 06:59 PM
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My guess would be there is an internal problem in that booster. I'd take it off and return it. if brakes release ok with vacum removed from booster.

Just my .02

Tony
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Old 01-30-2010, 08:31 PM
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sounds like it has no return spring inside it wow..

maybe its defective, forgot the spring when assembling it.,

or some other problem with it.

normally they just leak vacuum or just dont work at all.


odd..
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Old 01-30-2010, 09:34 PM
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yeah thats what i sad, thnx for the advice
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