clutch master cylinder or slave cylinder? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 11-20-2011, 03:14 AM Thread Starter
SJD
 
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clutch master cylinder or slave cylinder?

a few weeks ago i was waiting at a light with my 97 in 2nd gear and the clutch pedal to the floor. i took my foot off the brake and the truck started to roll forward, which wouldn't have been weird only it was going forward UP hill.
did some experimenting, when left in gear at a light or stop sign while holding the clutch pedal down, after about 10 seconds the clutch will start to engauge with the pedal to the floor. clutch never fully engauges, just slips enough to move the truck a little. and when this happens the pedal gets stuck about half way down and I have to pull it the rest of the way up with my foot.
my question is: is this the clutch master cylinder letting fluid bypass internally somewhere? or is it the clutch slave cylinder going bad?
would i just be better off replacing both of them?

thanks in advanced
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post #2 of 6 (permalink) Old 11-21-2011, 07:17 PM
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Re: clutch master cylinder or slave cylinder?

I had a issue with my pedal sticking like that when my throwout bearing was unlubricated.

Do you have a factory clutch and hydraulics?

sounds like you should try bleeding the system and flushing some fresh DOT 3 through there.

Also, what is the condition of you clutch pivot arm with that little white plastic bushing? also, while down there wiggle around the pedal assembly, and check out your pedal box bushings.

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post #3 of 6 (permalink) Old 11-21-2011, 09:22 PM
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Re: clutch master cylinder or slave cylinder?

Everything he said.
Start externally with a fluid flush and bleed the system. Check up under the dash around the pedals for excess movement and if it still persists I would say stuck throwout or pilot.
I wouldn't say it's a slave or master losing pressure, if it was then the pressure wouldn't come back after you tipped the pedal back up again. Follow?
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post #4 of 6 (permalink) Old 11-22-2011, 10:52 PM
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Re: clutch master cylinder or slave cylinder?

Had a similar problem on my dad's 94. It was bushing! There are some good write ups on oil burners I think about eliminating the bushings and installing an adjustable heim joint. Also through alot of wear the slave on his the plastic lip that the snap ring sits in to hold the slave to the firewall wore out and let the slave move before it actually engaged. So its no fixed mounted mounted from the outside with an adjustable heim joint. Even the previous owner (bought it new) drove it again and says the pedal hasn't had that good of a feel ever!

Bottom line, get under the dash and figure out where its loose. If you have any questions feel free to PM me. I can get you pics of the mods I did on his if you would like. Good luck!

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post #5 of 6 (permalink) Old 11-22-2011, 11:38 PM
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Re: clutch master cylinder or slave cylinder?

Just going to correct you read quick to prevent confusion, the master is on the firewall, same as brakes, slave is under the truck.
But I do agree, it is probably a bushing.
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post #6 of 6 (permalink) Old 11-23-2011, 12:14 AM Thread Starter
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Re: clutch master cylinder or slave cylinder?

sounds like everything is pointing toward the throwout bearing.
friday i'm doing a lot of work to it and i will be checking it out then.
thanks for the input!
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