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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

Bad Slave Cylinder???

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Old Nov 9, 2013 | 02:11 PM
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Bad Slave Cylinder???

Hey guys, I have a 1988 F250 and have been having issues with my clutch. Mainly Putting it into reverse. I replaced the master clutch cylinder because there was some seepage inside the cab so I figured that was the problem. I have bleed and bleed the clutch to the point I have gone through 3 bottles of brake fluid. The clutch lets out way to soon. Maybe an inch or less off the floor.

I know that it is not the clutch it's self because as my helper was pushing in on the clutch while I was bleeding it, I can see that the rod on the slave cylinder is not pushing the fork far enough.

Now I am thinking that my slave cylinder is bad. But I always thought that if the slave cylinder was bad that you would just have no pressure in the pedal. I had one go bad on me in a 94' F150 I had before and that is what it did.

I don't see where it is leaking, and I am not loosing fluid. So could it be the slave cylinder?
 
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Old Nov 9, 2013 | 02:50 PM
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joey2fords
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check for slop in the linkage/pedal bushings under the dash.
check for flex in the firewall.
 
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Old Nov 9, 2013 | 04:21 PM
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The pedal bushing is torn up a little bit. It pops the rod of the master off a little bit. I will replace that. And there is maybe a 1/16" of flex. Popping the rod back into place does help. The pedal is stiff. It is not mushy at all. How much flex is acceptable?
 
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Old Nov 9, 2013 | 07:33 PM
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I drilled a 3/16 hole and cotter keyed mine
 
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Old Nov 9, 2013 | 09:43 PM
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That would keep it from popping off.
 
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Old Nov 9, 2013 | 09:44 PM
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But is there something wrong with my slave pump?
 
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Old Nov 9, 2013 | 10:20 PM
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I had an 88 and the clutch would engage lower and lower as the fluid was leaking out and collecting in the bell housing. When my clutch was shot I went ahead and changed the slave and the problem was solved. Not sure what trans and engine combo you have but mine was a 302 with a 5 speed.
 
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Old Nov 9, 2013 | 10:39 PM
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According to ford and the Chilton and Haynes repair manuals you should replace both at the same time slave cylinders are a pain to bleed follow manual procceedures
 
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Old Nov 10, 2013 | 12:02 AM
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Slave cylinder goes out when you can't get into gears when the engine is running.

Does it go into gear when you double clutch? lol, could just be failing syncros. PRetty normal on the M5R2 trans
 
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Old Nov 10, 2013 | 07:45 AM
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It's a ZF 5 speed behind a 7.3. Being that it is an external slave cylinder it is fairly easy to swap out. Just bleeding it is the pain. I will go ahead and swap it out and see what that does for me. It's only like $29.99 at O'Reilly's for new slave cylinder. It does go into gears. Like I said reverse is the problem and sometimes first.
 
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