07-01-2019, 02:43 PM | #1 |
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6MT clutch pedal action
Current owner of a '17 M3 with a 6MT, with the comp package although that probably doesn't make a difference with my question.
I have about 16K miles now, have been driving a manual for 10+ years so I'd like to believe that I'm not overly wearing down the transmission due to inexperience. Every once in awhile, the pedal travel will feel "spring-y", where it's almost like there's a squeaky spring or coil that is slightly pushing back or introducing vibration. But after that one-time in/out of the pedal, it goes back to being normal. Hard to describe. Like if you were just normally walking down the street, and then for just 1 step you landed on a spring. I don't know enough mechanically, to diagnose or identify the root cause. Maybe the clutch cylinder (from a rudimentary google search), or an "assist spring"? An image I found online of the pedal set-up, maybe there is some issue with part #21. Any help is greatly appreciated, before I go to see the service center. I imagine they won't be able to replicate this because it happens to me maybe once every 1-2 months.
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07-06-2019, 08:44 AM | #2 |
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This has been an on-going issue for me, especially during spirited drives when I shift quickly between gears.
I brought this to the attention of my Service Centre and it's normal. Apparently most modern manual cars have a clutch restrictor installed and that slows the return of the clutch pedal to it's neutral position between shifts. This really bothered me and I put in a 'clutch stop' so the pedal does not have to travel all the way to the floor. The actual engagement point is about 65-70% of the clutch travel. Short-end of it, it's normal. |
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07-13-2019, 10:25 PM | #3 |
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I put a BMS clutch stop in as well, issue is that here and there it goes into 1st a bit "rough", I think that I will remove one of the shims in the stop so I don't ruin the synchros.
Last edited by Kilabyte; 07-14-2019 at 11:02 AM.. |
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07-14-2019, 04:02 PM | #4 |
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This weekend I have felt this spring-y clutch pedal as well. Only really in first gear in the beginning of my drive. Then seems to go away.. very weird after 8k miles. Assuming it’s normal, the forum is great !
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07-29-2019, 06:50 PM | #5 | |
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However, the difference was noticeable - especially during quicker shifts. |
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08-09-2019, 11:26 AM | #7 |
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There is a hidden clutch delay valve inside the slave cylinder in the S55 and N55 manuals. They share the same transmission.
I have a really annoying WOT 1-2 shift delay and it might be due to the Clutch Delay Valve. Here is a good DIY to remove it. M3/M4 and M2 manuals have the exact same transmission. Lots of wrong information on the forum being posted about the M4 not having a CDV, it does not have a conventional external CDV but instead its integrated into the slave cylinder which needs modification. Worth looking into. https://f87.bimmerpost.com/forums/sh...ch+delay+valve
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08-10-2019, 12:39 PM | #8 |
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clutch delay when downshifting
I've had a '17 ZCP 6 speed for a few months...is the clutch delay valve causing what feels like a tenth of a second delay of the pressure plate grabbing when I downshift? I completely release the clutch, then the clutch grabs some time shortly after and the revs rise. Annoying.
Last edited by Mendoteach; 08-12-2019 at 10:07 AM.. |
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08-15-2019, 08:09 AM | #9 | |
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08-17-2019, 12:02 AM | #10 |
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08-17-2019, 01:39 AM | #11 |
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No problem. However, I looked into removing the clutch restrictor and it's quite an undertaking. If you are planning on removing it, please record/write-up the process - from the diagrams it looks intensive.
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08-20-2019, 12:14 AM | #12 | |
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08-20-2019, 09:20 AM | #13 | |
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03-31-2021, 02:20 PM | #15 |
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04-26-2021, 09:23 PM | #16 |
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04-27-2021, 12:33 AM | #17 |
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I had a ship do it for me. I'll ask them how the did it.
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04-30-2021, 11:41 PM | #19 |
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it's done from the bleed valve on the clutch slave cylinder.
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08-05-2021, 10:55 AM | #20 |
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Quick question on the subject, does a brake fluid change also bleed and change the clutch brake line (I know they share the same brake fluid reservoir)? Or does it require to bleed the clutch line like you do for each wheel brake line?
Have one last scheduled maintenance brake fluid change at the dealer before the DIY changes, and wondering if I need to specifically request the clutch change with the brake fluid change. |
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