Hey, just removed the CDV from my 335i today. Very straightforward and much simpler than the CDV removal from my E46 M3. Steps are as follows:

1. Jack the front end up and put it on JACK STANDS. Do not get under a car that is supported by a jack only.

2. Remove the...

what exactly does this do?

Hey HyperM3 i got your message, but cant PM, hasnt been 24-48 until they approve me lol crap

Is there anyone in Socal around the long beach area that can do this? I don't have the tools If there is PM me a 12 pack of brew for the one who does it for mee

Just did the CDV delete and the actual removal was easy! Getting the car jacked up and safely on stands was the biggest pain in the a$$. Make sure you properly clamp off the hydraulic hose leading into the CDV so you don't lose too much fluid. Mine slipped and dumped a few ounces all over me and the floor making the bleeding of the line a long process.

10 minutes to safely jack & support car.
2 minutes to clamp line, remove clips, remove CDV, re-install the line and re-install the clips.
30 minutes to bleed the air out of the line.
5 minutes to bring the car off the jacks & stands.

Result: much improved clutch response during normal driving, especially starting in 1st gear and shifting to second.

Was it worth it? YES.

Did this mod yesterday in about an hour and the shifting has extremely improved. Wish I would have done this 6 months ago when I bought the car.

sooo... thread necro here.

You don't actually need to buy any parts to delete the CDV on an E9x car? Assuming of course that you have standard hand tools and the appropriate pressure bleeder and cap adapter. Because I am looking to buy a BMW in the near future (maybe a 335i) and the one thing that I have consistently not liked about BMWs is the clutch feel - other than that I've found them to be wonderful little cars.

Its not necessary to buy another CDV to modify. There is a little piece of metal inside the CDV which has an aperture to limit the flow of clutch fluid. I used the blunt end of a 3mm drill bit to tap it out. It doesn't take much force at all and it comes out very easily. You could get it out with finger pressure only, but its easier to tap it on something.

Need HELP!!!

I tried to do the CDV replacement today. I had a lot of difficulty getting everything reconnected, and a lot of fluid leaked out in the process. I had topped off the brake fluid reservior before starting. Due to the messy CDV replacement, I assumed there was air in the line. I started to bleed the line from the bleeder valve (2 person method). During the first few rounds of open/clutch/close/release, some fluid came out, but the pedal never went limp or had to be pulled back up as expected. After a few more rounds, the clutch pedal would still spring back up, but there was very little resistance when being pressed. We repeated this cycle at least 20 times. No change.

Obviously something is wrong, or more likely, something I did is wrong. Can anybody help me figure it out? What can I do to fix it?

THANKS!

For the record, I still offer the service of doing the CDV mod for anyone in the area. I also supply the modded CDV in my service of $35 for i and $45 for xi. Ive done almost 100 of these by now with no issues.

Nice and easy mod - no more funky clutch on my E92 328i!

I did this mod yesterday with a buddy of mine and cannot believe why I waited almost 20k miles before doing it. It is like driving a different car and I finally have full control of my clutch and gear shifting. It is silly that BMW even puts these in.

I highly recommend doing this mod and don't waste your money on buying a modified valve. Just modify yours by following this: http://www.billswebspace.com/BMWCDVModification.htm
Took me 2 minutes to pop out the restrictor plate and the plastic ring. Super easy.

Enjoy!

Just did this mod today and can't believe I didn't do it for 3 years. I did it only because my car went out of warranty.

Anyhow, it was not as EASY as everyone says to do because of the bleeding part. The bleeding hex nut was a bitch to get to. In addition, it is very difficult to jam the brake tubing to the nozzle of the bleeder valve. I spent over 90 minutes to complete this job, which I thought would only take 20 minutes.

I also can't believe why people would sell the damn modified CDV. All you had to do was take the stock CDV, and punch out the restricter like everyone says. It was so easy.

The bleeding process was not difficult and it definitely had to be done.

I just completed this mod this past weekend, and it also took me longer than 20 minutes. However, it's definitely worth the effort. Being able to predictably shift from 1st into 2nd is wonderful. Previously, the clutch movement for 1st to 2nd would vary depending on the weather and how warmed up the car was... now I think it's much more consistent and I don't need to slow down on the clutch peal right before full engagement - I can just use a smooth & consistent motion and nail it.

Im still available for people if they need this done. I can do it in 10 minutes. I also include the modified CDV in my pricing. PM me if needed.