E90Post
 


GetBMWParts
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Best Clutch Bleeding Technique for CDV



Reply
 
Thread Tools Search this Thread
      04-28-2009, 08:32 AM   #1
328skidpad
Lieutenant
328skidpad's Avatar
14
Rep
417
Posts

Drives: 08 335 e92 14 e350 15 BoxGTS
Join Date: Jun 2005
Location: Pittsburgh-MARS, PA

iTrader: (0)

Best Clutch Bleeding Technique for CDV

I had a big problem bleeding my clutch as I got air into my master cylinder and clutch slave cylinder. Here is an excellent video that fixed my problem.
I was especially happy because I did not have to buy a motive pressure bleeder, pay $50 and wait 3-4 days to get it



you can buy the oil can at any auto store and ask for vacume tubing they sell it by the foot for less than $1 per foot.

The process took 5 minutes max

If you have experience driving a manual car, I definitely recommend the cdv mod. If makes the car feel faster and it is how a clutch should feel.

PS

I first did the 2 person procedure open bleeder--press clutch-close bleeder--release clutch procedure, but is was ardious and for some reason got air into my master cylinder.

I then used a bleeding gun to suck fluid from the clutch slave cylinder but it did not work well and several BMW mechanics told me that it is not very effective because it is sucks the fluids and minimal air.


Good luck
Appreciate 0
      04-29-2009, 09:05 AM   #2
txusa03
Major General
213
Rep
6,567
Posts

Drives: TS330iPPSP6MT
Join Date: Jul 2005
Location: Planet Earth

iTrader: (3)

That's a cool video, thanks for sharing. I love how DIY video makes everything seem so easy. If anyone tried to bleed the clutch on an e90 you know it is not that easy because the bleed valve is located in a very tight space. I did not have room to loosen the nut on the valve.

Everything is so easy when you assembled it on top of a work bench
__________________
under construction!
Appreciate 0
      04-29-2009, 11:27 AM   #3
328skidpad
Lieutenant
328skidpad's Avatar
14
Rep
417
Posts

Drives: 08 335 e92 14 e350 15 BoxGTS
Join Date: Jun 2005
Location: Pittsburgh-MARS, PA

iTrader: (0)

You have to use a 7/16 wrench not ratched one, I got at at sears for $2

The first turn is the hardest (opening it) and is easier by pushing the metal tubing a little which is connected to the CDV

Also dont waste your money buying a modified cdv because all it takes is a thin drill bit. Basically just insert the drill bit through the smaller hole in the cdv. Just put pressure while the drill bit is turning and the restrictor will just fall out. Dont worry you wont break anything.

after the restrictor comes out, just clean the cdv and blow air through it to get any plastic fragments out.
Appreciate 0
      04-29-2009, 02:11 PM   #4
scanboy
Lieutenant
United_States
10
Rep
456
Posts

Drives: E90 Montego Blue+Black Int.
Join Date: Sep 2007
Location: Torrance

iTrader: (0)

Quote:
Originally Posted by 328skidpad View Post
Also dont waste your money buying a modified cdv because all it takes is a thin drill bit. Basically just insert the drill bit through the smaller hole in the cdv. Just put pressure while the drill bit is turning and the restrictor will just fall out. Dont worry you wont break anything.
So is drilling necessary, it sounds like you can actually push it out with the thin drill bit.
Appreciate 0
      04-30-2009, 02:13 AM   #5
samwoo2go
Banned
145
Rep
781
Posts

Drives: E92 335i
Join Date: Sep 2007
Location: SoCal

iTrader: (12)

dude don't drill it. You just need a hex wrench thats small enough to go thru the smaller opening but big enough to not come all the way out. place the cdv on the ground, big opening down. stick the hex wrench thru the smaller opening till it stops. Get a hammer and lightly tap once on the wrench, the "guts" will come out right away w/o much force. Trust me, this is the best way to do it. its just a plastic stopper.
Appreciate 0
      04-30-2009, 12:08 PM   #6
328skidpad
Lieutenant
328skidpad's Avatar
14
Rep
417
Posts

Drives: 08 335 e92 14 e350 15 BoxGTS
Join Date: Jun 2005
Location: Pittsburgh-MARS, PA

iTrader: (0)

Correct you can just push it out with a hex wrench, but I used a drill and a tiny drill bit because I have a steady hand and it was faster.

Good luck...
Appreciate 0
      05-09-2010, 02:12 PM   #7
JamesUKE92
New Member
26
Rep
27
Posts

Drives: E92 330i
Join Date: Oct 2009
Location: UK

iTrader: (0)

I know this is an old thread, but I've just removed my E92 CDV today, and ended up with no fluid in the system after trying to bleed... The reservoir was up to the MAX mark, so I was mystified, and worried that I wouldn't be able to figure it out.

Eventually I noticed that the way the reservoir is partitioned for brake / clutch is bloody daft... There is a tiny tiny little partition at the back left (where the flexible woven reinforced pipe exits to clutch master). This is the only volume of fluid dedicated to clutch, and only flows in from the rest of the reservoir when it is absolutely brim full (way above the MAX line).

Hence it is very easy and not at all obvious that the reservoir can be at MAX level, but the clutch reserve is gone!!!!

After noticing this and keeping the reservoir absolutely full, I still couldn't satisfactorily bleed all the air out, and it's still a bit spongy but luckily drivable... After reading this thread, I'll be buying an oil can to try again...
Appreciate 0
      05-13-2010, 09:02 AM   #8
txusa03
Major General
213
Rep
6,567
Posts

Drives: TS330iPPSP6MT
Join Date: Jul 2005
Location: Planet Earth

iTrader: (3)

Quote:
Originally Posted by JamesUKE92 View Post
I know this is an old thread, but I've just removed my E92 CDV today, and ended up with no fluid in the system after trying to bleed... The reservoir was up to the MAX mark, so I was mystified, and worried that I wouldn't be able to figure it out.

Eventually I noticed that the way the reservoir is partitioned for brake / clutch is bloody daft... There is a tiny tiny little partition at the back left (where the flexible woven reinforced pipe exits to clutch master). This is the only volume of fluid dedicated to clutch, and only flows in from the rest of the reservoir when it is absolutely brim full (way above the MAX line).

Hence it is very easy and not at all obvious that the reservoir can be at MAX level, but the clutch reserve is gone!!!!

After noticing this and keeping the reservoir absolutely full, I still couldn't satisfactorily bleed all the air out, and it's still a bit spongy but luckily drivable... After reading this thread, I'll be buying an oil can to try again...
Hey, GL with the oil can method and let us know how well the oil can method work.
__________________
under construction!
Appreciate 0
      05-13-2010, 11:29 AM   #9
Mr. 5
Modder Raider
Mr. 5's Avatar
Scotland
374
Rep
8,633
Posts

Drives: M3
Join Date: Apr 2007
Location: Surf City, HB

iTrader: (31)

Garage List
2007 e90 335i  [4.00]
Quote:
Originally Posted by 328skidpad View Post
You have to use a 7/16 wrench not ratched one, I got at at sears for $2

The first turn is the hardest (opening it) and is easier by pushing the metal tubing a little which is connected to the CDV

Also dont waste your money buying a modified cdv because all it takes is a thin drill bit. Basically just insert the drill bit through the smaller hole in the cdv. Just put pressure while the drill bit is turning and the restrictor will just fall out. Dont worry you wont break anything.

after the restrictor comes out, just clean the cdv and blow air through it to get any plastic fragments out.
It's actually an 11mm wrench but 7/16 will work.
__________________
e36 M3 Coupe, e36 325i Sedan
e90 335i--SOLD

Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM
Appreciate 0
      12-21-2011, 05:07 PM   #10
Swerve
New Member
0
Rep
6
Posts

Drives: E91 320d se
Join Date: May 2011
Location: Newcastle upon Tyne

iTrader: (0)

What an excellent video and post. Thanks very much.
Appreciate 0
      01-07-2012, 11:37 PM   #11
Hierlevelz
Captain
30
Rep
868
Posts

Drives: 11 AW E9X M
Join Date: Dec 2011
Location: ENYC

iTrader: (9)

Anyone try this method?
Appreciate 0
      01-07-2012, 11:46 PM   #12
AlanAZ
Captain
AlanAZ's Avatar
17
Rep
812
Posts

Drives: E90 325i sport manual
Join Date: Aug 2009
Location: Scottsdale, AZ

iTrader: (4)

I've used it. It works. And yes, the partition height in the brake reservoir is retarded.
Appreciate 0
      06-11-2012, 02:39 PM   #13
JaSSon
Down with the N54.
JaSSon's Avatar
10
Rep
410
Posts

Drives: I has a E92!
Join Date: Mar 2011
Location: Columbus, OH

iTrader: (0)

Ok, I tried this to no avail. Oilers are cheaply made and the oiler I found delivered air mixed in with the brake fluid. I tried to use a water bottle held upside down with a hose through the cap in place of the oiler. I forced a whole 12oz bottle of brake fluid up into the clutch system, and it the pedal was still mushy. I finally went back to my vacuum pump brake bleeder. I held just a few inches vacuum against the closed bleeder, and instructed my helper to slowly press the clutch pedal. I cracked open the bleeder for a split second and tons of fluid and bubbles came out. We did that 4 times, filled the res, 4 more times, filled the res, and 4 more times and we were good to go. The few inches of vacuum ensured no air could enter the bleeder, and the pressure on the pedal forced the air through the system.
Appreciate 0
      03-21-2014, 12:50 PM   #14
Casca
Captain
17
Rep
637
Posts

Drives: E90 6MT
Join Date: May 2010
Location: California

iTrader: (0)

I used a 100cc syringe



I have a tip on the end that seals just OK enough that it doesn't let air in, but if I press down hard on the syringe, it will leak some fluid. So I fill the syringe from the reservoir, connect to the slave bleed screw, push syringe down till some fluid leaks out and I am sure there is no air in the line and then loosen the bleed screw up a bit and press down on the syringe slowly. Lock the bleed screw before I run out, rinse and repeat if needed. Works great.
Appreciate 0
      05-13-2014, 08:09 AM   #15
Efthreeoh
Major General
United_States
866
Rep
6,887
Posts

Drives: E90 & Z4 Coupe
Join Date: May 2012
Location: MARLAND

iTrader: (0)

Okay, my advice. Just get a fucking Motive Power Bleeder ($50). Took literally 5 minutes to bleed after set up, with perfect result the first time. That stupid video was a waste of time. I spent 4 hours on Sunday trying to bleed the clutch in what I thought would be a 20 minute job (for every other car I've done); nope, it's a BMW. I tried pulling the fluid with my fluid extractor, tried pumping the pedal, pulled the fluid while pumping, and tried that stupid video method.

Power bleeder, get it, don't screw with any other method.
Appreciate 0
      05-14-2014, 07:42 AM   #16
GreaseJunkie
First Lieutenant
United_States
5
Rep
302
Posts

Drives: 2006 e90 330i Black Sapphire
Join Date: Apr 2014
Location: Virginia

iTrader: (0)

Bled mine with 2 ppl and about 5mins. Instead of the: open bleeder, depress pedal, close bleader method, I used the way I was taught:

Bleeder closed, pump clutch pedal rapidly about 30x then hold to floor and open bleeder. Close, release, and repeat. Do this 5 times for good measure
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 03:53 AM.




e90post
e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST