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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Mar-25-2010, 07:11:10 PM   #11
Function7
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Unlike the 6-speed clutch, the SMG clutch uses the SMG fluid (Pentosin CHF-11s) to actuate the clutch. You do not need to flush the clutch if you're flushing the brakes on an SMG equipped car.
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Old Thu, Mar-25-2010, 07:14:19 PM   #12
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Awesome!
That's what I wanted to hear. Thanks a lot
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Old Thu, Mar-25-2010, 09:29:29 PM   #13
.333 snubnose
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Quote:
Originally Posted by PIR3lly View Post
Not the smg hydraulics, but the clutch.
As previously stated...same thing.

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Clutch on a M3 uses the same fluid as the brakes (at least, that's what I've been told)
And while we are on the topic of 6MT...
although the clutch cylinder uses the same brake fluid, is it really necessary to bleed both together? How is it different than any other manual tranny? (other than convenience )

Not trying to bust your balls...just wondering if the M3 6MT clutch fluidics are unique.
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Old Thu, Mar-25-2010, 09:40:52 PM   #14
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Quote:
Originally Posted by .333 snubnose View Post
And while we are on the topic of 6MT...
although the clutch cylinder uses the same brake fluid, is it really necessary to bleed both together? How is it different than any other manual tranny? (other than convenience )

Not trying to bust your balls...just wondering if the M3 6MT clutch fluidics are unique.
It's common in manual cars to have the clutch and brake circuits share the same reservoir. All you need is one hose and the manufacturer saves on one more part for the car.

You really don't need to bleed the clutch when you're bleeding the brakes. It's a completely different master cylinder. If, however air gets into the clutch line, then bleeding it is necessary.

When flushing (changing) the brake fluid, flush both of them since you don't want any of the old fluid in the system.

-A
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Old Thu, Mar-25-2010, 10:50:56 PM   #15
.333 snubnose
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Learn something new everytime I get on this board...
Fifteen years of driving, four manual transmissions, and I never knew that existed
Is this something fairly new?
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Old Thu, Mar-25-2010, 11:46:51 PM   #16
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Originally Posted by .333 snubnose View Post
Learn something new everytime I get on this board...
Fifteen years of driving, four manual transmissions, and I never knew that existed
Is this something fairly new?
I assume so. My older cars used to have separate reservoirs while my newer ones (non BMW) have just one shared reservoir. Just another casualty of cost cutting in the auto industry.

-A
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Old Fri, Mar-26-2010, 01:36:26 AM   #17
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I was under the impression that the bleeding of the SMG needed to be done by the GT1 machine..has anyone actually performed this service without it??
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Old Fri, Mar-26-2010, 01:42:29 AM   #18
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I was under the impression that the bleeding of the SMG needed to be done by the GT1 machine..has anyone actually performed this service without it??
You have to use a GTI system or the AutoEnginuity to bleed the SMG system. This thread was about bleeding a standard 6-speed, not an SMG.

-A
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Old Thu, May-17-2012, 09:26:52 PM   #19
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Default Re: Do I need to bleed the clutch on an SMG when doing a brake fluid change?

Just to clarify - SMG and manual have different actions to the word 'bleeding'

On the manual the clutch and brake lines share the brake fluid from the master cylinder. When u 'bleed' a manual clutch, you are feeding past fluid from this nipple point to a collection container - this is physical.

On an SMG - the brake system does not share fluid with the SMG clutch. They are both independent. When people refer to the 'SMG bleed' it means to purge the hydrulic lines of air that may exist via valve actuations - this is done by the GT1 or any equiv software. You don't physically take out any fluid from the SMG unit. The trapped air is then vented to the top of the SMG header tank. If you actually want to physically bleed the SMG unit i.e. change the fluid in the unit then one needs to either bleed it from the shift travel cylinder (nipple bit) or unscrew the lines from the hydrulic lines.
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Old Fri, May-18-2012, 12:15:03 AM   #20
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Default Re: Do I need to bleed the clutch on an SMG when doing a brake fluid change?

Quote:
Originally Posted by Function7 View Post
You have to use a GTI system or the AutoEnginuity to bleed the SMG system. This thread was about bleeding a standard 6-speed, not an SMG.

-A
Umm...........no.........it's about SMG...read the title.

So from what i gathered for 6mt makes sense to bleed the clutch also because you want all the fluid that will be in the same reservoir to be changed......and for SMG just do the brakes because there is a different reservoir and fluid for the SMG clutch making it not neccessary to get all the brake fluid out.....Correct?
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Discussing Do I need to bleed the clutch on an SMG when doing a brake fluid change? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)