Question about 1992 Ford F250

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I have a 1992 ford f-250 4x4 460 eng. with auto trans with over drive when i give it gas the ac goes to defrost and the trans does not shift i feel it has a vacume leek but i can not find it also the brakes are mushy and go to the floor i put a new master cylender in so i feel thats not it

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I think you are on the right track about a vacuum leak. I would check all those pesky little rubber vacuum hoses that are used for pollution control. They tend to go hard and split if they are over 10 years old, allowing air /vacuum leaks into the inlet manifold which upsets things that are controlled by vacuum such as the vacuum modulator on the transmission. As for the mushy brakes you may still have an air lock in the hydraulic system which would need a complete bleed to fix.

Posted on Aug 31, 2010

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