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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 06-20-2014, 04:46 PM
fortunateson fortunateson is offline
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Location: New Westminster, BC
 
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Mein Auto: 525i
Question Clutch Master Cylinder re&re

Clutch pedal goes all the way to th efloor with no resistance. Must be time to replace it? Used "search" function couldn't find a DIY. Anyone have a documented "how-to" preferably with pics? The car is a '02 525. Thanks.
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  #2  
Old 06-20-2014, 04:50 PM
edjack edjack is offline
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Consider replacing the slave cylinder first, as it's easier to get to - the master cylinder is up under the dash.

If the slave is bad, the master will soon fail.
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Old 06-20-2014, 05:01 PM
fortunateson fortunateson is offline
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Quote:
Originally Posted by edjack View Post
Consider replacing the slave cylinder first, as it's easier to get to - the master cylinder is up under the dash.

If the slave is bad, the master will soon fail.
Would a bad slave cylinder cause a dead pedal?
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  #4  
Old 06-20-2014, 05:07 PM
edjack edjack is offline
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Either one will. The fluid leaks past the piston seal. The return spring inside either cylinder could also be broken.

You can test the slave cylinder spring by bleeding the system.

Make sure the rear portion of the master cylinder reservoir is full.

Dismount the slave cylinder, but leave the hose connected. Push the actuator rod all the way in. Let it out slowly. Repeat 3 times. Remount slave cylinder.

If the return spring is broken, the piston rod will not fully return, if at all.
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Last edited by edjack; 06-20-2014 at 05:10 PM.
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  #5  
Old 06-20-2014, 05:07 PM
JimLev JimLev is offline
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Mein Auto: 540/6, S60 Volvo, Tribeca
Quote:
Originally Posted by fortunateson View Post
Would a bad slave cylinder cause a dead pedal?
Yes, did you see my post over on Bimmerforums?
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2000 540/6 Slightly tweeked...everywhere
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  #6  
Old 06-20-2014, 05:16 PM
fortunateson fortunateson is offline
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Location: New Westminster, BC
 
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JimLev, Yes I saw it. The car has 189000 miles on it. I'm thinking I should replace both the master and the slave ( Ihope that doesn't sound too communistic!) considering both are original. The clutch re and re , especially if a new flywheel is needed, is going to cost a few bucks though I have everything for the job except for the flywheel.
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