Welcome to the North American Subaru Impreza Owners Club Friday March 27, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Transmission (AT/MT) & Driveline

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-08-2007, 07:31 PM   #1
AliBenn
NASIOC Supporter
 
Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default Has Anyone experienced Clutch Pedal Fade??

and then clutch pedal feel mysteriously returns to normal??
~
have narrowed this down when it happens to me
after hard driving or an autoX
~
someone advised could be overheated clutch(brake) fluid tht squeezes thru the clutch master cylinder seals??
also claimed tht this occurs in C5 corvettes alot.
when this occurs, you can still shift the tranny, but basically 1inch of avail travel of clutch pedal.
~
related mods: stage II

thanks
* Registered users of the site do not see these ads.
AliBenn is offline   Reply With Quote
Old 10-09-2007, 12:26 PM   #2
putz
Scooby Newbie
 
Member#: 154987
Join Date: Jul 2007
Chapter/Region: MWSOC
Location: SaINt ClOuD
Vehicle:
06 wrx tr 28k mile
for sale in MN

Default

YES, I was driving in a parade and reving the motor while I was stupidly slipping the cutch, by the end I pushed the clutch in to finaly shift to 2nd, and I had no pressure. It sucked, the car cooled down for about 1.5 hours and had harsh engagment. man was that stupid. It auto-xs just fine. prolly not the same problem.
putz is offline   Reply With Quote
Old 10-09-2007, 12:28 PM   #3
CatfaceType-R
Scooby Guru
 
Member#: 81102
Join Date: Feb 2005
Chapter/Region: MWSOC
Location: CPH Tuning/Consulting
Default

probably happens to EVERY manual car driven hard...the smoother you are with it, the less this will happen. I have no fact to back it up...only experience with driving hard vs. driving smooth and hard
CatfaceType-R is offline   Reply With Quote
Old 10-09-2007, 12:43 PM   #4
02scoobydoo
Scooby Newbie
 
Member#: 154992
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: Oxford NJ
Vehicle:
02 wrx w/2.5 block
blue

Default

i experienced this driving home from work after installin a new clutch.(not hard driving, but i do sit in traffic a lot). happened once and went back to normal, then again a few miles later. unfortunately i threw a rod bearing that night so i have a new block. i beleive it might have been air in the line so i bleed it while doing the block. haven't had it happen since
02scoobydoo is offline   Reply With Quote
Old 10-09-2007, 01:50 PM   #5
nhluhr
John Wayne Toilet Paper
Moderator
 
Member#: 7327
Join Date: Jun 2001
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2008 Mazdaspeed3
2006 Wrangler Sport

Default

you guys do know that the clutch fluid doesn't come anywhere near the actual clutch on a WRX, right?

It is an external slave cylinder that pushes a little pin out which in turn pushes a lever. There are so many interfaces cbetween the fluid and source of clutch heat that it is *impossible* to say heat from the clutch is fading your fluid.

You need to look elsewhere to explain this.
nhluhr is offline   Reply With Quote
Old 10-09-2007, 02:09 PM   #6
02scoobydoo
Scooby Newbie
 
Member#: 154992
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: Oxford NJ
Vehicle:
02 wrx w/2.5 block
blue

Default

Quote:
Originally Posted by nhluhr View Post
you guys do know that the clutch fluid doesn't come anywhere near the actual clutch on a WRX, right?

It is an external slave cylinder that pushes a little pin out which in turn pushes a lever. There are so many interfaces cbetween the fluid and source of clutch heat that it is *impossible* to say heat from the clutch is fading your fluid.

You need to look elsewhere to explain this.

true, which is why i said possible air in the lines.
02scoobydoo is offline   Reply With Quote
Old 10-09-2007, 03:42 PM   #7
AliBenn
NASIOC Supporter
 
Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default

Quote:
Originally Posted by nhluhr View Post
you guys do know that the clutch fluid doesn't come anywhere near the actual clutch on a WRX, right?

It is an external slave cylinder that pushes a little pin out which in turn pushes a lever. There are so many interfaces cbetween the fluid and source of clutch heat that it is *impossible* to say heat from the clutch is fading your fluid.

You need to look elsewhere to explain this.
hmmm
i was thinking of overheating only bc there is the clutch fluid line above the tranny to the left of the turbo(under the intercooler). i did notice tht the clutch fluid line is wrapped with a protective layer of plastic. (i was assuming bc of potential problem of heat-soak.

if the problem is air in the line why is the problem intermittent?
wouldn't the pedal fade be constant?
just like mushy brake pedal after opening up brake fluid system?
signed
more confused
AliBenn is offline   Reply With Quote
Old 10-10-2007, 08:12 AM   #8
02scoobydoo
Scooby Newbie
 
Member#: 154992
Join Date: Jul 2007
Chapter/Region: Tri-State
Location: Oxford NJ
Vehicle:
02 wrx w/2.5 block
blue

Default

Quote:
Originally Posted by AliBenn View Post
hmmm
i was thinking of overheating only bc there is the clutch fluid line above the tranny to the left of the turbo(under the intercooler). i did notice tht the clutch fluid line is wrapped with a protective layer of plastic. (i was assuming bc of potential problem of heat-soak.

if the problem is air in the line why is the problem intermittent?
wouldn't the pedal fade be constant?
just like mushy brake pedal after opening up brake fluid system?
signed
more confused
i wish i knew, but it's the only thing i can come up with lol
02scoobydoo is offline   Reply With Quote
Old 10-11-2007, 11:33 AM   #9
AliBenn
NASIOC Supporter
 
Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default

anyone?
AliBenn is offline   Reply With Quote
Old 10-15-2007, 03:03 PM   #10
AliBenn
NASIOC Supporter
 
Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default

anyone??
AliBenn is offline   Reply With Quote
Old 10-16-2007, 09:45 AM   #11
Element Tuning
Former Vendor
 
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
673 WHP Element
Tuning Pro Comp Engine

Default

Quote:
Originally Posted by AliBenn View Post
and then clutch pedal feel mysteriously returns to normal??
~
have narrowed this down when it happens to me
after hard driving or an autoX
~
someone advised could be overheated clutch(brake) fluid tht squeezes thru the clutch master cylinder seals??
also claimed tht this occurs in C5 corvettes alot.
when this occurs, you can still shift the tranny, but basically 1inch of avail travel of clutch pedal.
~
related mods: stage II

thanks
This has happened to me while road racing and I'm confident it's an overheating issue (from exhaust components or transmission not clutch itself) with old clutch fluid that accumulates moisture over time. It's the same feeling you get when you overheat your brake fluid which releases gas in the line and since this compresses you loose your pedal.

I just flushed the system with a high quality brake fluid such as ATE or Motul 600 and didn't have a problem after that.

Thanks,
Phil
www.elementtuning.com
Element Tuning is offline   Reply With Quote
Old 10-16-2007, 11:51 AM   #12
John Vanos
Scooby Newbie
 
Member#: 49307
Join Date: Nov 2003
Location: Toronto, ON
Vehicle:
2006 Open Class STI

Default

Yep, had that happen on our rallycar a few times....I agree with Phil, seems like an overheating problem. We flushed the system completely with Motul RBF 600 and never have had a problem since
John Vanos is offline   Reply With Quote
Old 10-16-2007, 05:25 PM   #13
Storm
Scooby Guru
 
Member#: 5218
Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
Vehicle:
96L Most Over-
Developed Beater

Default

I'll 3rd the overheating diagnosis....coming from the driver of a harshly autocrossed NA car.

Flush the fluid with fresh stuff and you will more than likely be trouble free.

Jay Storm
Storm is offline   Reply With Quote
Old 10-17-2007, 03:23 PM   #14
AliBenn
NASIOC Supporter
 
Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default

excellent, thanks guys
AliBenn is offline   Reply With Quote
Old 04-17-2012, 10:13 PM   #15
Wrgb
Scooby Specialist
 
Member#: 169096
Join Date: Jan 2008
Chapter/Region: VIC
Location: Langley BC Canada
Vehicle:
2009 DGM STi Hatch
2000 2.5RS *Gone*

Default

Just to bump and old thread.

I am having the same problem as the OP.

is there any way to determine if it is:
-Old Fluid
-Bad Master cylinder
-bad Slave Cylinder
-Bad Hoses

Thanks guys
Wrgb is offline   Reply With Quote
Old 04-17-2012, 10:13 PM   #16
Wrgb
Scooby Specialist
 
Member#: 169096
Join Date: Jan 2008
Chapter/Region: VIC
Location: Langley BC Canada
Vehicle:
2009 DGM STi Hatch
2000 2.5RS *Gone*

Default

Just to bump and old thread.

I am having the same problem as the OP.

is there any way to determine if it is:
-Old Fluid
-Bad Master cylinder
-bad Slave Cylinder
-Bad Hoses

Thanks guys
Wrgb is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Has anyone experienced worsened handling with aftermarket wheels? fatcircles Brakes, Steering & Suspension 23 01-24-2008 12:40 PM
Has anyone experienced extended cranking w/ UTEC installed Stiguy247 Engine Management & Tuning 11 05-30-2005 09:48 AM
Anyone else's clutch pedal stay down?? BlackRS New England Impreza Club Forum -- NESIC 15 11-29-2004 03:48 PM
02 WRX: Anyone here experiencing creaking clutch pedal? kenchan Mid West Subaru Owners Club Forum -- MWSOC 13 06-02-2004 10:03 AM
Has anyone installed STI pedals? popnGEAR Vancouver Impreza Club Forum -- VIC 6 01-21-2003 10:55 PM


All times are GMT -4. The time now is 12:27 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.