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Old 03-05-2010, 08:05 PM   #1
ultimateX5
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Help! How to bleed my slave cylinder!!?

So I changed my slave clyinder and I've tried bleeding it and the peddle doesn't firm up? heard they're pretty hard to bleed? Is there a special way to do this? It's a 87 325is. Any help would be appreciated.
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Old 03-05-2010, 08:39 PM   #2
everlast
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From the Bentley:

"5.1 Bleeding Clutch Hydraulic System
Bleeding the clutch hydraulic system is necessary to remove
any air from the lines that may affect the function of the
clutch slave cylinder, and to drain the system when changing
the fluid.
Bleeding the clutch is similar to bleeding the brakes. Aerated
or contaminated fluid is expelled from the system and
replaced with new, clean fluid. The three basic methods: pressure
bleeding, vacuum bleeding, and manual bleeding are
used to force fluid through the line and release it at the
bleeder valve on the slave cylinder. For more information on
bleeding methods and on handling brake fluid, see B RAKES.
To bleed the clutch manually, have an assistant pump the
clutch pedal a few times and then hold it down. Open the
bleeder valve to expel the old fluid, then close the valve and
release the pedal. Repeat the procedure until the fluid runs
clear and without bubbles.
If you suspect that there is still some air in the lines, remove
the slave cylinder from the transmission as described below.
Push the pushrod all the way in, then release it slowly. This will
force any remaining air in the fluid back into the fluid reservoir.
When finished, check the fluid level and top it up if necessary.
"
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Old 03-05-2010, 10:27 PM   #3
ultimateX5
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Thanks for the info..I tried the manual way but it just doesn't get firm enough. I don't know if it'll take a while cuz it was completly empty..I'll try again tomorrow and hopefully it works.
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Old 03-05-2010, 11:15 PM   #4
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Perhaps bleeding the brakes would help (since its the same fluid, I think...) Dunno, never done it.

Wait, how "firm" should it be? Is the clutch working? If so, its maybe fine?
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Old 03-05-2010, 11:34 PM   #5
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The clutch doesn't have that reflex of coming back up and it doesn't work...I'm gna try to pressure bleed from the bottom and see if that'll work better
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Old 03-05-2010, 11:39 PM   #6
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Ah, I see what you're saying. Let us know how it goes for sure, and good luck.
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Old 03-06-2010, 12:17 AM   #7
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Are you absolutely sure the rod is sitting in the "Divot"?
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Old 03-06-2010, 01:44 AM   #8
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Were you able to prime bleed the cylinder prior to installing?
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Old 03-06-2010, 01:58 AM   #9
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Quote:
Originally Posted by ACS_DAN View Post
Are you absolutely sure the rod is sitting in the "Divot"?
Yep.I even pulled the slave clyinder out a couple times n got my buddy to press the clutch while I tried to push the rod in..theres no way it would engage the clutch.just not enough pressure.
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Old 03-06-2010, 02:00 AM   #10
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Quote:
Originally Posted by slemmer View Post
Were you able to prime bleed the cylinder prior to installing?
I was told I didn't need to. If all fails on getting it to work I'll pull it off and try it.
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Old 03-06-2010, 10:38 AM   #11
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Unfortunately as a rule of thumb if the slave cylinder goes then the Master is soon to follow. That may be the case here?
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Old 03-06-2010, 11:03 AM   #12
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You've got the bleeder valve on the top right, not facing down?
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Old 03-06-2010, 01:25 PM   #13
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Yep it's facing up
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Old 03-06-2010, 01:42 PM   #14
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Actually no.there's no way it will fit with the bleed nipple facing up...
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Old 03-06-2010, 02:14 PM   #15
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Remove the slave point the nipple down and try manually pushing the cylinder in with your hands. If it builds pressure then you're good and it could be something else. Got enough fluid in the reservoir? Basic, but could be vital.
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