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Old May 16, 2014 | 04:18 PM
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1999SuperDutyStroke's Avatar
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Brake issue

I have a 2000 SCrew KR F150. A couple of weeks ago I noticed the brake pedal was slowly going to the floor while at a red light. I pulled over and popped the hood checked the fluid reservoir. It was full, so obviously no wheel cylinder issues or fluid loss. Any suggestions? I haven't had a chance to tear into it yet.
 
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Old May 16, 2014 | 04:28 PM
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Master cylinder has an internal leak.
 
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Old May 16, 2014 | 05:51 PM
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it is possible to have an ABS problem / internal leak and get the same result.
 
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Old May 16, 2014 | 07:29 PM
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But most likely the M/C.
 
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Old May 16, 2014 | 07:29 PM
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I'll go with the master cylinder bypassing internally.
 
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Old May 16, 2014 | 11:00 PM
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I appreciate the help guys, I am new to the 150s. Just trying to learn all that I can before I go rip-snorting into it. With an ABS problem wouldn't the light be on?
 

Last edited by 1999SuperDutyStroke; May 16, 2014 at 11:02 PM. Reason: Forgot to add something
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Old May 17, 2014 | 02:20 AM
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Originally Posted by pdqford
Master cylinder has an internal leak.
I'll 2nd that!
 
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Old May 19, 2014 | 11:28 AM
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More than likely (as the other guys said) it's an internal leak in the master cylinder. So far *knock on laminate covered particle board* I haven't had problems with either of mine.
 
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Old May 24, 2014 | 02:24 PM
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..bump...how'd you make out with the brakes issue?
 
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Old May 28, 2014 | 11:44 AM
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Originally Posted by pdqford
Master cylinder has an internal leak.
Is the only fix for that to replace the master cylinder?
 
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Old May 28, 2014 | 07:31 PM
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That is the over whelming advice! Common problem.
 
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Old May 28, 2014 | 08:37 PM
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......curious to see how he made out.....The abs module bypassing fluid has been an issue also..not a cheap fix there! I have been waiting to take the plunge and buy a new one$$$
 
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Old May 29, 2014 | 09:03 AM
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It has, but the m/c has a much higher occurance.
 
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Old Jun 26, 2014 | 01:26 PM
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Originally Posted by fmtrvt
It has, but the m/c has a much higher occurance.
Would this also cause the ABS dash light to come on?

My brake pedal has been doing this for some time. I assumed it was air in the lines and just needed bled, but now the ABS light is on continually.
 
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Old Jun 29, 2014 | 12:02 AM
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Hmm, common problem, eh? Maybe that's why my 98 does that? So if it is the master cylinder, it would not brake well at all, even if you put hard pressure on the peddle, would it?

Sent from Nexus 4. IB AutoGroup
 
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