F30 Clutch Delay Valve Delete

F30inthe6ix · 08-02-2018, 11:36 AM

Has anyone locally done a CDV delete on their F3X?

I've been reading up on it and people seem to be pretty satisfied with how their transmission shifts and feels after doing it, but I'd love to see a local example before I go ahead and look into doing it on my own car.

Thanks for looking!

F30inthe6ix · 08-10-2018, 10:05 AM

Nobody...?

TOMF30N55 · 03-13-2022, 12:47 PM

xxfinity · 03-15-2022, 12:11 AM

I did it on my 435ix last summer. It's literally the best MOD I did on my car. 100% worth it. Would super recommend it!

It's a bit harder to do with an xdrive car since the drive shaft to the front diff gets in the way. Specially if you're doing this on the driveway and not on a lift. The access is definitely much more restricted.

If you don't want to "break" and take out the delay valve, heard some people had issues with it (it actually breaks the seals and causes huge leak after reinstall), you can also remove the clutch delay valve and install slave cylinder from an e92. That's the path I took.

silver28 · 03-22-2022, 12:59 PM

Do you know of any shops that have experience doing this in Toronto? I hate going under my car for fear of it dropping on my head.

F30mean · 03-29-2022, 01:57 PM

KTM Motorworks did this for my F30 2 years ago during a clutch job. Would recommend the mod (& KTM as well)!

xxfinity · 03-30-2022, 10:43 PM

Any shop should be able to do this for you. You'll have to either provide them the alternative part or instruct them to install the e92 slave cylinder.

Th3Walrus · 03-31-2022, 07:13 AM

What alternative part? I believe you either remove the CDV orifice from your slave cylinder, or replace the slave cylinder with an older one.

xxfinity · 04-22-2022, 03:34 PM

Quote:

Originally Posted by Th3Walrus

What alternative part? I believe you either remove the CDV orifice from your slave cylinder, or replace the slave cylinder with an older one.

BMW 21526785964 is the part number for the E92 slave cylinder.

I've read on other forums of people having success just taking their slave cylinder out and removing the CDC orifice, and also saw that some people screwed up the process of taking the orifice and breaking the internal seals on the cylinder. But they didn't find out they broke it till they tried to bleed it, after reinstalling, and ending up with a big pool of hydraulic fluid on the driveway.

I just decided to buy a new and known good one to avoid any issues.

xxfinity · 04-22-2022, 03:46 PM

Here are some side by sides. From when I installed it.

brigade24 · 05-03-2022, 11:34 AM

i actually removed the orifice and reinstalled the cylinder back in. be careful with the rubber o-ring on the actual clutch line. if its not installed properly, it will leak.

save yourself the headache and go with an e92 slave cylinder. from the cars ive worked on, this is actually one of the easier ones to swap out.

this mod def improved feel and the car is easier to drive but i didnt get the impression that it was astronomically different.

xxfinity · 05-03-2022, 03:23 PM

Interesting... My experience is that the clutch delay valve on the F32 is pretty bad. My brother has an E92, and I can still get a feel of the clutch on his E92.

Before I did my MOD, I was never able to properly figure out where the bite point was.

brigade24 · 05-04-2022, 11:40 AM

agreed. when/where the clutch would bite was ambiguous before this mod. it made it easier to drive in that sense.

Dayen · 10-19-2025, 08:57 AM

I am ordering this part 21526785964 to put on my 2017 330i with the b46, from the homeowork I've done even though the slave cylinder shows different fitment, it was used on some cars with the N20 which means it should be compatible with my B46 transmission?
I'm replacing my clutch so I'm trying to ensure the new one has the best life it can!

08-02-2018, 11:36 AM	#1
F30inthe6ix Lieutenant 129 Rep 475 Posts Drives: 2012 F30 BMW 328i 6MT Join Date: Mar 2016 Location: Toronto iTrader: (0)	F30 Clutch Delay Valve Delete Has anyone locally done a CDV delete on their F3X? I've been reading up on it and people seem to be pretty satisfied with how their transmission shifts and feels after doing it, but I'd love to see a local example before I go ahead and look into doing it on my own car. Thanks for looking! __________________ 2012 F30 BMW 328i 6MT - Alpine White on Coral Red - Harmon Kardon Sound - Premium Package - Executive Package - BMW Apps Package - Sport Package - Dinantronics Sport - Dinan Springs / Bump Stops
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08-10-2018, 10:05 AM	#2
F30inthe6ix Lieutenant 129 Rep 475 Posts Drives: 2012 F30 BMW 328i 6MT Join Date: Mar 2016 Location: Toronto iTrader: (0)	Nobody...? __________________ 2012 F30 BMW 328i 6MT - Alpine White on Coral Red - Harmon Kardon Sound - Premium Package - Executive Package - BMW Apps Package - Sport Package - Dinantronics Sport - Dinan Springs / Bump Stops
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03-13-2022, 12:47 PM	#3
TOMF30N55 Enlisted Member 13 Rep 33 Posts Drives: 2013 335i xdrive 6mt Join Date: May 2021 Location: NYC iTrader: (0)
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03-15-2022, 12:11 AM	#4
xxfinity Enlisted Member 6 Rep 47 Posts Drives: 2014 BMW 435xi Join Date: Aug 2018 Location: Toronto, ON iTrader: (1)	I did it on my 435ix last summer. It's literally the best MOD I did on my car. 100% worth it. Would super recommend it! It's a bit harder to do with an xdrive car since the drive shaft to the front diff gets in the way. Specially if you're doing this on the driveway and not on a lift. The access is definitely much more restricted. If you don't want to "break" and take out the delay valve, heard some people had issues with it (it actually breaks the seals and causes huge leak after reinstall), you can also remove the clutch delay valve and install slave cylinder from an e92. That's the path I took.
	Appreciate 0 Quote

03-22-2022, 12:59 PM	#5
silver28 Private First Class 91 Rep 185 Posts Drives: 2014 F32 435i xdrive 6 speed Join Date: Nov 2011 Location: Toronto, Ontario, Canada iTrader: (0)	Do you know of any shops that have experience doing this in Toronto? I hate going under my car for fear of it dropping on my head.
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03-29-2022, 01:57 PM	#6
F30mean New Member 0 Rep 13 Posts Drives: F30 335i Join Date: Jun 2019 Location: Toronto, Ontario iTrader: (0)	KTM Motorworks did this for my F30 2 years ago during a clutch job. Would recommend the mod (& KTM as well)!
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03-30-2022, 10:43 PM	#7
xxfinity Enlisted Member 6 Rep 47 Posts Drives: 2014 BMW 435xi Join Date: Aug 2018 Location: Toronto, ON iTrader: (1)	Any shop should be able to do this for you. You'll have to either provide them the alternative part or instruct them to install the e92 slave cylinder.
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03-31-2022, 07:13 AM	#8
Th3Walrus Captain 865 Rep 902 Posts Drives: 2020 X3MC Alpine White/Sahkir Join Date: Sep 2020 Location: Ontario iTrader: (1)	What alternative part? I believe you either remove the CDV orifice from your slave cylinder, or replace the slave cylinder with an older one.
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04-22-2022, 03:46 PM	#10
xxfinity Enlisted Member 6 Rep 47 Posts Drives: 2014 BMW 435xi Join Date: Aug 2018 Location: Toronto, ON iTrader: (1)	Here are some side by sides. From when I installed it. Attached Images
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05-03-2022, 11:34 AM	#11
brigade24 First Lieutenant 162 Rep 320 Posts Drives: 2013 335 X-dive Join Date: Jun 2018 Location: Canada iTrader: (0)	i actually removed the orifice and reinstalled the cylinder back in. be careful with the rubber o-ring on the actual clutch line. if its not installed properly, it will leak. save yourself the headache and go with an e92 slave cylinder. from the cars ive worked on, this is actually one of the easier ones to swap out. this mod def improved feel and the car is easier to drive but i didnt get the impression that it was astronomically different.
	Appreciate 0 Quote

05-03-2022, 03:23 PM	#12
xxfinity Enlisted Member 6 Rep 47 Posts Drives: 2014 BMW 435xi Join Date: Aug 2018 Location: Toronto, ON iTrader: (1)	Interesting... My experience is that the clutch delay valve on the F32 is pretty bad. My brother has an E92, and I can still get a feel of the clutch on his E92. Before I did my MOD, I was never able to properly figure out where the bite point was.
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05-04-2022, 11:40 AM	#13
brigade24 First Lieutenant 162 Rep 320 Posts Drives: 2013 335 X-dive Join Date: Jun 2018 Location: Canada iTrader: (0)	agreed. when/where the clutch would bite was ambiguous before this mod. it made it easier to drive in that sense.
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10-19-2025, 08:57 AM	#14
Dayen Enlisted Member 14 Rep 46 Posts Drives: F30 330i, E30 316, 2024 Tacoma Join Date: Sep 2025 Location: North Kingstown RI iTrader: (0)	I am ordering this part 21526785964 to put on my 2017 330i with the b46, from the homeowork I've done even though the slave cylinder shows different fitment, it was used on some cars with the N20 which means it should be compatible with my B46 transmission? I'm replacing my clutch so I'm trying to ensure the new one has the best life it can!
	Appreciate 0 Quote