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Losing pressure in clutch at WOT

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Old 02-20-2013, 08:51 PM
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Losing pressure in clutch at WOT

Let me paint the picture. This will only happen on a 3rd and 4th gear pull when there is more strain on the trans. I can do a WOT pull starting in 3rd. At about 5k if you leave your foot resting on the clutch pedal you can feel the pedal sink to the floor all the way to 7k when its time to shift. By the the pedal is stuck to the floor with no pressure. Once you pump it 2 or 3 times you are good to shift into 4th. Same thing when going from 4th to 5th. It will not do this in 2nd. It only does this at WOT, normal driving to about 80% throttle its fine. Any ideas? Pressure plate, throwout bearing? Just wondering if anyone else has had this issue. Ill also mention the car is a high 400whp/tq on a 4 puck clutch.
Old 02-20-2013, 08:54 PM
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when you replaced the clutch, did you put a new tob/slave in?
Old 02-20-2013, 09:09 PM
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uhhhh.... lol... Im pretty sure when I ordered it I got it with the slave but I doubt the tob has ever been replaced.
Old 02-20-2013, 09:11 PM
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um. the slave IS the TOB?
Old 02-21-2013, 08:20 AM
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Lol shows how much I know about this. Im just gonna do what I always do when it comes to the drivetrain and just take it to someone.
Old 02-21-2013, 08:34 AM
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TOB is dying. Simple fix. Just a PITA to do.
Old 02-21-2013, 12:02 PM
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Gonna try the master cylinder first. If that don't fix it then ill try the slave/tob
Old 02-22-2013, 01:08 AM
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I've been down that road. It's the TOB. Trust me.
Old 02-22-2013, 07:04 AM
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We had an RS4 doing that. Ended up puting a TOB and a master cylinder in it.
Old 02-24-2013, 02:22 PM
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Tob.
Old 02-25-2013, 12:41 PM
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Tob.
Old 02-25-2013, 12:52 PM
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Originally Posted by USMCFieldMP
TOB is dying. Simple fix. Just a PITA to do.
this.

i had this issue before and its just gona get worse if you dont fix it soon dude
Old 02-26-2013, 06:27 PM
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Replaced the tob today. Now It feels like there is too much pressure on the clutch pedal after a hard pull. So once again I still can't not shift into the next gear until I pump the pedal once or twice.
Old 03-12-2013, 12:45 PM
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Personally when replacing the TOB/Slave Cylinder I would replace the Master at the same time.

This might be a rhetorical question.. But did you bleed the clutch after installing the new TOB?
Old 03-12-2013, 12:51 PM
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If he didn't bleed the clutch there wouldn't be any pressure. The trans has to come out to change the tob so if he changed it and has too much pressure, I'd guess he bleed it
Old 03-12-2013, 05:03 PM
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Your foot shouldn't ever rest on the clutch except the split second before you shift or holding for a hill.

If you press the clutch in without resting on it does it shift fine?
Old 03-13-2013, 12:21 PM
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Originally Posted by m33pm33p
Your foot shouldn't ever rest on the clutch except the split second before you shift or holding for a hill.

If you press the clutch in without resting on it does it shift fine?
lol... who the **** are you???? please comment else where, your no help.

Anyways everything has been replaced now, minus the adjustable clutch rod from zzp which will be ordered next week. If that dont fix it, then who knows what else it could be. And the system got reblead like twice. Someone mentioned synchros but I have never been able to feel synchros in my clutch pedal.

If this doesnt fix the problem then Im selling the car. Anyone want a high 400hp cobalt?????
Old 03-13-2013, 02:56 PM
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Originally Posted by startingline05
lol... who the **** are you???? please comment else where, your no help.

Anyways everything has been replaced now, minus the adjustable clutch rod from zzp which will be ordered next week. If that dont fix it, then who knows what else it could be. And the system got reblead like twice. Someone mentioned synchros but I have never been able to feel synchros in my clutch pedal.

If this doesnt fix the problem then Im selling the car. Anyone want a high 400hp cobalt?????
You mad bro?

"hovering" over the clutch is a super no no. But you already know that right..


Throwing money at a problem doesn't always fix it. Have the master checked before you go and spend more money on parts that aren't needed.
Old 03-13-2013, 03:22 PM
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You sell the car over a bad TOB?
Old 03-14-2013, 10:48 AM
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Originally Posted by Dart_SI
You sell the car over a bad TOB?
naw I wanna sell the car because I want a new project, 2006 saab 9.2. But ill prob just keep the car and get the saab anyways

And its not the tob or master. all thats been replaced.
Old 03-14-2013, 10:54 AM
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Originally Posted by m33pm33p
You mad bro?

"hovering" over the clutch is a super no no. But you already know that right..


Throwing money at a problem doesn't always fix it. Have the master checked before you go and spend more money on parts that aren't needed.
Im never mad, lol.

But how would you expect me to tell everyone what the clutch did? You think I was gonna do a third gear pull from 60 to 115ish while looking at my clutch pedal and describe what it did???? be forreal the car doesnt go straight lol. Resting my foot on the clutch pedal so I can feel my clutch sink to the floor through a hard pull was the best way to describe the issue. So Im sure hovering over my clutch pedal for a pull isnt going to hurt anything.
Old 04-03-2013, 04:52 PM
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Alright bringing this issue back up cuse it still isnt fixed. I have replaced.... EVERYTHING. still losing clutch pressure. There has to be air getting in the lines somewhere. I talked to a guy with a mazda which I guess has the same style setup as us when it comes to the clutch pedal being tied into the brakes somehow. He is telling me to replace the selonoid on the brake booster line. Any thoughts to that?
Old 04-05-2013, 12:19 AM
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Have you checked all your calipers to make sure you aren't losing any fluid? The seal around the ebrake mechanism on the rear calipers are bad about leaking over time.
Old 04-06-2013, 08:15 AM
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I finally said screw it and took it to a different shop. The first shop that first replaced the slave cracked an oring where the line going from the master to the slave goes into the trans housing. So that's why everytime we tried something there was still air in the lines. The shop also forgot to place two bolts back into the top of the trans housing and left another bolt halfway out. Not to mention they over tightened the fuse boxes under the hood so the plastic broke and there is not a good connection so my lights and other things will turn on and off. (they did replace that)

Anyways with it leaking, it was leaking inside the trans housing all over my clutch which ended up being soaked in dot3. All parts are on order and should be in Monday. Hopefully I have a brand new feeling car again lol.
Old 04-13-2013, 09:04 AM
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Originally Posted by startingline05
I finally said screw it and took it to a different shop. The first shop that first replaced the slave cracked an oring where the line going from the master to the slave goes into the trans housing. So that's why everytime we tried something there was still air in the lines. The shop also forgot to place two bolts back into the top of the trans housing and left another bolt halfway out. Not to mention they over tightened the fuse boxes under the hood so the plastic broke and there is not a good connection so my lights and other things will turn on and off. (they did replace that)

Anyways with it leaking, it was leaking inside the trans housing all over my clutch which ended up being soaked in dot3. All parts are on order and should be in Monday. Hopefully I have a brand new feeling car again lol.
i swear shops are getting "notorious" at tearing/destroying/not putting ish in place. i got a new tranny put in and i was all happy.. but car ran like ****. i popped the hood. Very 1st vacuum line in the middle wasn't even hooked up (06 ss/sc) n to make matters worst they had it running in a loop to the evap (whichever is under the hood) so cleared codes and plugged hose in. car good? nope.. when i got to 60 my steering would shake terribly.. so i took it to a diff shop n they asked "did u put a new axle in?" i was like "....nah but i did get another tranny in there, why?" and that's when he pointed out the lug for the wheel that tightens on the axle wasn't even tight. they tighten them up but man i know shops are supposed to be pros n what not but now i go over there work OR I'm questioning what goes on smh


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