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Master cylinder question

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Old Jun 5, 2007 | 08:57 AM
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Master cylinder question

I have 1990 Ford F150 6 cylinder 4X4. The rear brake line is screwed into long nut that is screwed into the master cylinder. I would assume that the nut is a pressure regulator or a one way valve. There are no wires going to it. What is it and were can I get one. It appears to be leaking. Parts people at ford have no idea what that is.

Thank you for your help

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Old Jun 5, 2007 | 11:59 AM
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It is Ford's inline version of a proportioning valve
 
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Old Jun 5, 2007 | 12:03 PM
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Do you know where I can get one? I could not find it in AutoZone, Pep Boys, or Ford Dealer.
 
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Old Jun 5, 2007 | 12:10 PM
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You may have to purchase a genuine Ford/Motorcraft master in order to get it...but call Ford back and ask them to look for the proportioning valve mounted on the master cyclinder for your truck..........sometimes just the correct part name can make a parts-person look like a hero....
 
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Old Jun 5, 2007 | 02:20 PM
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I want to say that it's called a residual pressure valve, but I don't know for sure...
 
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Old Jun 6, 2007 | 08:42 AM
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Oh yes........I think Eric is correct and I'm wrong....I just don't remember seeing a proportioning valve after the master cyclinder..........it might be incorporated into the ABS valve ?
 
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Old Jun 6, 2007 | 12:12 PM
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Thank you very much for your help
 
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