Clutch Delay Valve (CDV) Removed

[Mark CSL]

BMW puts in place to limit the flow of hydraulic fluid to the clutch, supposedly to minimize stress to the components. It was introduced around the same time BMW began offering included service that covered clutches.

It does make the clutch take-up/engagement somewhat unpredictable and sluggish at times, making for a sometimes jerky ride.

DIY takes about 20 minutes, and you'll need somebody to help you bleed the clutch fluid after you're done.

You'll need an 8mm socket, a small flat blade screw driver, a 10mm wrench, and possibly a little bit of hydraulic brake fluid.

What a differance this makes
this is the part


Email me at k13csl@aol.com and i will send you the guide inc pictures

[estoril]

I removed the one on my Z4MC and it made a massive difference to clutch feel...

[SSS]

Originally Posted by estoril

I removed the one on my Z4MC and it made a massive difference to clutch feel...

I did this to my old Z3MC but only because once the braided hose was used it prevented the difficulty of engaging gear once the clutch fluid was very hot.

I don't think my 1M has any "slow" clutch problem judging by the traction light flashing

[Mark CSL]

Its made a huge differance and its an easy job to do

[SSS]

Originally Posted by Mark CSL

Its made a huge differance and its an easy job to do

Fair enough, I have not done on the 1M, but have on the Z3MC and although I can't say it made any difference in acceleration at all what I did find is that after a long journey it made the clutch less spongy


But that was changing the rubber hose and removing the valve at the same time.

I can't detect a delay in my 1M clutch to be honest. But I am running over 400 torques so that may compensate I suspect.

[sailorbaz]

I need to do this to my Z3M Roadster as SSS mentioned, once hot finding a gear can be a bit of an issue with the standard setup. Must look up a braided clutch line too.