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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Please advise!!

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Old Dec 3, 2014 | 12:34 PM
  #16  
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A sudden loss of braking suggests a ruptured brake line, are you losing brake fluid?

If not then the master cylinder is a suspect even of it's been replaced recently, some of these refurbished parts are pretty bad these days.
 
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Old Dec 3, 2014 | 12:53 PM
  #17  
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Thanks

That's gonna be something I look at when I get some help guys, I'm thinking it may be a ****ty master because im not losing fluid anywhere, but for it to just go bad all of a sudden is odd
 
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Old Dec 3, 2014 | 01:37 PM
  #18  
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Is it a brand new master cylinder?
 
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Old Dec 3, 2014 | 01:48 PM
  #19  
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if the seal between the front and rear circuit in the master goes bad you will get exactly like you are describing. the master will bypass the one circuit and you will have almost no stopping power.
 
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Old Dec 3, 2014 | 02:20 PM
  #20  
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Thanks guys

I appreciate the help, I hope it's that simple
 
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Old Dec 3, 2014 | 07:39 PM
  #21  
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Yup

Brand new, gonna go back and get another one
 
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Old Dec 3, 2014 | 07:45 PM
  #22  
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I seem to recall reading that you have to bench bleed the master cylinder before installing it or it won't bleed correctly and you'll have a soft pedal. Or am I remembering incorrectly? If I do remember correctly, then if you had a bad master cyclinder and replaced it without bench bleeding it you'd still have the same problem.

Of course if I'm not remembering correctly than pitch this whole response in the bit bucket and call me a taxi to the local old folks home.
 
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Old Dec 3, 2014 | 10:14 PM
  #23  
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Did that

Bench bled for about 10 minutes until I could barely push anymore and no bubbles...think I got a ****ty master

Originally Posted by Island Time
I seem to recall reading that you have to bench bleed the master cylinder before installing it or it won't bleed correctly and you'll have a soft pedal. Or am I remembering incorrectly? If I do remember correctly, then if you had a bad master cyclinder and replaced it without bench bleeding it you'd still have the same problem.

Of course if I'm not remembering correctly than pitch this whole response in the bit bucket and call me a taxi to the local old folks home.
 
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