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  #1  
Old 09-30-2013, 08:32 AM
winmutt's Avatar
85 300D 4spd+tow+h4
 
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Repeated premature clutch slave failure.

3 different brands, the current one being ATE. Anyone experiencing this or have suggestions on how to fix?

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  #2  
Old 09-30-2013, 11:18 AM
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ive had two in a row fail once, but figured it was a fluke. Third one lasted forever. Never 3 in a row.

Maybe aftermarket is an option? I cant remember what you said, but were you running some kind of stiffer clutch?

Ive been very pleased with my wilwood aftermarket clutch master personally
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  #3  
Old 09-30-2013, 12:15 PM
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Did you in fact find a defect in each slave, or is the clutch not disengaging, with unidentified cause. Understand that the process of replacing the slave may change something which temporarily fixes the problem. Will putting the old one in fix it for some duration? (PIA, I know).

Did you bleed well, do you have to bleed repeatedly? Will air come out if you bleed it now?

Water in the brake fluid can corrode the slave cyl, but this takes a while.

Does the slave appropriately engage the release fork?
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  #4  
Old 09-30-2013, 12:33 PM
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85 300D 4spd+tow+h4
 
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The problem in all three cases was occasional pedal to floor with fluid leaking into the trans. I have not looked this time but pedal has gone to floor several times over the months and brake light fluid is coming on (now that its working heh).
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  #5  
Old 09-30-2013, 01:18 PM
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Take 'em to bits to see what's up.
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  #6  
Old 09-30-2013, 01:20 PM
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Extending too far to dis-engage the clutch?
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  #7  
Old 09-30-2013, 01:49 PM
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More data needed

Quote:
Originally Posted by winmutt View Post
3 different brands, the current one being ATE. Anyone experiencing this or have suggestions on how to fix?
What vehicle is this = year and model...


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  #8  
Old 09-30-2013, 02:05 PM
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87 300d. 190D trans (.411)

Sadly I just purchased 2x PEX from a competitors site. Keep forgetting how valuable Pelican is these days. *IF* there is a next time I will get the OE from here.
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  #9  
Old 09-30-2013, 02:27 PM
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I cannot see how could 3 NEW slave cylinders fail. Did you bleed the clutch properly from the bottom? I changed the M and S clutch cylinders on my 190D. They were dirt cheap close-out units and they work fine.
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  #10  
Old 09-30-2013, 02:36 PM
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I always bleed from the bottom up. The first one, granted came with the trans, unknown age. The second one was a rebuild and the third an ATE. I did find several references to failed ATE's of late...
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  #11  
Old 09-30-2013, 02:50 PM
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Quote:
Originally Posted by winmutt View Post
I always bleed from the bottom up. The first one, granted came with the trans, unknown age. The second one was a rebuild and the third an ATE. I did find several references to failed ATE's of late...
Premature failure - does it imply new units? Rebuild is not new.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #12  
Old 09-30-2013, 04:31 PM
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85 300D 4spd+tow+h4
 
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Quote:
Originally Posted by ah-kay View Post
Premature failure - does it imply new units? Rebuild is not new.
Not sure what you mean.
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  #13  
Old 09-30-2013, 05:40 PM
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What kind of brake fluid are you using?
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  #14  
Old 09-30-2013, 06:18 PM
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I've always used "Febi" on my 123s and never a problem.
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  #15  
Old 09-30-2013, 07:53 PM
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There is a 2mm thick spacer that goes between the slave cyl and bell housing. Without it you can over pressure the system when pressing the pedal all the way to the floor.

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