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Discussion Starter · #1 ·
If you may or may not already know, my S40 suffered transmission failure. You can read more about it <A HREF="http://forums.swedespeed.com/zerothread?id=54714" TARGET="_blank">here</A>.<p>On my service writeup, the following part was replaced:<br>8667378-7 CONTROL CYLINDE<p>I'm wondering if this is the master/slave cylinder.
 

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Re: What is a "control cylinder"? (MarvynDT)

Yep, that's the slave cylinder, located within the transmission/clutch housing. And if this isn't a warranty job, it should be because that is not a wear item. And it can cause the clutch to slip, stick, etc leading to failure.<br>Tom.
 

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Discussion Starter · #3 ·
Re: What is a "control cylinder"? (tmtalpey)

The throwout bearing and slave cyclinder are one piece, as confirmed by both mcvolvo in my original post and the dealership I just called who told me that this needs to be replaced during any clutch job. I'm still running around in circles.
 
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