RS4 sticky clutch

[Rs4_tony]

sorry, you replaced your JHM clutch with what? the same clutch? So you just needed a new pressure plate?

Did you get the 5r pressure plate, or another painted stock RS4 pressure plate?

when did you do this?

I bought a whole new clutch stage 4 from JHM bc I wasn’t sure what the exact issue was.

The 5r isn’t out yet and JHM said I have no need for it.

I did this about 3-4 weeks ago.

[Rs4_tony]

Sorry i make a new post, this app isnt giving me an “edit” option. I changed the friction plate and reused the old lwfw flywheel

[Axel]

Absolutely saki, but this is what I think was the issue in my case.

I do also run Motul RBF600 fluid.

I’ve been running RBF600 since I had everything installed 20 months ago.

Iirc you have an s4 with rs4 pressure plate and had sticky clutch?

Yes, but my sticky clutch symptoms seem to be slightly different than most people’s sticky clutch symptoms. Might still be the same issue though with a slightly different outcome.

[Rs4_tony]

Absolutely saki, but this is what I think was the issue in my case.

I do also run Motul RBF600 fluid.

I’ve been running RBF600 since I had everything installed 20 months ago.

Iirc you have an s4 with rs4 pressure plate and had sticky clutch?

Yes, but my sticky clutch symptoms seem to be slightly different than most people’s sticky clutch symptoms. Might still be the same issue though with a slightly different outcome.

Well if you do drop the tranny. Take a $150 hit and change the fork, t/o bearing, plastic piece, and some 6 bolts audi has listed for a clutch job.

[Axel]

Absolutely saki, but this is what I think was the issue in my case.

I do also run Motul RBF600 fluid.

I’ve been running RBF600 since I had everything installed 20 months ago.

Iirc you have an s4 with rs4 pressure plate and had sticky clutch?

Yes, but my sticky clutch symptoms seem to be slightly different than most people’s sticky clutch symptoms. Might still be the same issue though with a slightly different outcome.

Well if you do drop the tranny. Take a $150 hit and change the fork, t/o bearing, plastic piece, and some 6 bolts audi has listed for a clutch job.

That’s already been done. Didn’t help when it was done.

[AlexOSD]

A few of us have talked about the tendency of the RS4 clutch pedal to get ‘sticky’…sometimes it won’t come all the way up after certain driving conditions.

I have had it happen when I botch a rev-match badly…or when I have been logging the car and ran it to redline in third, then just popped the clutch in and disengaged, rolling along. As I would come to a stop I would notice the clutch might not come all the way up (75% or so) and would get stiff. I was doing some pbox testing the other night testing 60-90 MPH times in different shifting combinations. I found that if I revved 3rd out to past 90 MPH (approaching redline), then popped the clutch and threw it in neutral, this sticky/stiff situation would happen. If I revved out 3rd to past 90 MPH, then shifted into 4th, and kept going, no problem with the clutch…no matter if I got into 4th and kept going…or if I got into 4th and then just let the car engine brake from 5500 RPM or whatever it is, down till normalcy.

I would like to know why it’s happening. Apparently this was more common on the 2007 cars, but my car is a 2008 and it happens once in a while.

the other morning I revved the car while sitting in the parking garage (because I’m a hoodlum and it sounds awesome). I ripped revs up to about 6000 RPMs in neutral. I noticed the clutch got sticky there. I didn’t engage it…I didn’t put it into gear in any way…nothing. This was the clutch situation happening just from free revving the engine while stopped, in neutral.

Anyone have any ideas on this? I was thinking maybe my fluid might be getting knackered and could use a change. First idea.

Solved mine by changing the vacuum line… upgraded version, so order brand new and not a sitting-in-stock item. Mine was ordered in late 2011, removed 90% of the problem.

[Mistro]

^ Which vacuum line? The clutch fluid line? I believe Axel has the USP stainless steel lines (as do I) and still have the sticky clutch issues.

[Rs4_tony]

Mistro u still have the issue?

[ChrisK]

Interested in more info on the vac line. I know on ls1 cars if you made too much power you jeeded to upgrade your hydraulic lines and that fixed it. Also guys did the slave on rhe car side not the transmission side

[Mistro]

Mistro u still have the issue?

Two different issues. One was the clutch was not disengaging properly, resulting in a stiff shifter. That was resolved.

The sticky clutch issue is where, under the conditions sakimano described in the initial post, the clutch pedal does not come back up after a shift - you sometimes have to pull it up manually. This has been around since I was stock, just like the others.

[ChrisK]

Mistro u still have the issue?

Two different issues. One was the clutch was not disengaging properly, resulting in a stiff shifter. That was resolved.

The sticky clutch issue is where, under the conditions sakimano described in the initial post, the clutch pedal does not come back up after a shift - you sometimes have to pull it up manually. This has been around since I was stock, just like the others.

Is there a chance this issue can lead to the other issues…

[Mistro]

http://youtu.be/svyuvw9iqoU?t=7m1s

around 7:05 point

[Rs4_tony]

Haha

[soaRS4]

Haven’t throughly read the recent posts in this thread, but my old G35 had the same sinking clutch issue that the OP reports, which was a known issue with the G.
An immediate flush of the clutch fluid usually remedied the issue, but some people (on a rare occasion) had to replace the master cylinder.
It happened to me so I did flush and replaced the clutch fluid with DOT 4 or 5.1, which fixed the issue.
GL with fix.

[soaRS4]

Haven’t throughly read the recent posts in this thread, but my old G35 had the same sinking clutch issue that the OP reports, which was a known issue with the G.
An immediate flush of the clutch fluid usually remedied the issue, but some people (on a rare occasion) had to replace the master cylinder.
It happened to me so I did flush and replaced the clutch fluid with DOT 4 or 5.1, which fixed the issue.
GL with fix.

Sorry, replace the master and slave.