clutch pedal pressure goes up and down - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kouki_s14 · 03-05-2006, 11:50 PM

i searched and couldn't really find anyone with the same problem
so when my car is cold my clutch pedal is really soft and i have to push the pedal all the way to the floor for it to engage smoothly and not grind. Then as i drove around and the motor warmed up the clutch line, so i assume, the pedal got stiff and it caught near the top of the travel. been like this for some time now.
i think hmmm, there must be air in the line somewhere, so i finally have the time and i proceed to bleeding the clutch to get the air out. bleeding was done and nothing, pedal is mushy and yet again must be pushed to the floor to get into gear, i am absolutely sure there is no air in the line, since i bled it 20 times. i drove it around to try and warm up the line and see if the heat would firm up the pedal like it did before. i didnt drive too much, but it seemed like it helped move the catching point up, but i cant be sure. i will have to see tomorrow when im less tired. i dont understand why there is no pressure until it warms up, and bleeding it did not help. it was working fine right before i bled it, nice and firm. so im assuming the MC and SC are fine.
anyone have any ideas what might be wrong?

also i dont have a clutch dampener since my car was auto before
the clutch hardline is new from dealer and from hardline to slave is a stainless steel clutch line

thanks for any help

henry

kouki_s14 · 03-06-2006, 03:17 PM

anyone have ideas?

krustindumm · 03-06-2006, 11:06 PM

master or slave cylinder may be leaking.

Pull the dustboot back on the slave and look for fluid, if there is none, it's probably the master cylinder.

kouki_s14 · 03-07-2006, 12:33 AM

Quote:

Originally Posted by krustindumm

master or slave cylinder may be leaking.

Pull the dustboot back on the slave and look for fluid, if there is none, it's probably the master cylinder.

i thought that but it when i drove it today after 1/2 hr or so of driving it got firm and caught at the top again. i cant seem to figure it out.
i thought maybe since its warmer it made the seals expand and therefore got firmer, but then i realized that it might be leaking when the seals are colder.
so yet again i cant explain why this is happening
thanks for your help though, i may just go out and buy a new MC

henry

spirit · 03-26-2007, 11:16 PM

Did you find your problem? I have the same damn problem, tho when its real cold (like below 50F) and my clutch is to the floor, I get rubbing like noise as well. Just had a bran new Exedy stage one clutch installed too.

DJ_Sunrise · 04-18-2007, 03:37 PM

i had that problem before as well.. it turned out to be one of three things.. i honestly cant remember which one tho... clutch slave, master, or just needed to be bled.. do all three, not too expensive and it will ensure reliability.

kouki_s14 · 04-18-2007, 03:51 PM

thread is a year old guys, and yes i fixed the problem i just bought all new stuff. i was tired of dealing with it.

03-05-2006, 11:50 PM	#1
kouki_s14 Zilvia FREAK! Join Date: Jan 2004 Location: Los Angeles Posts: 1,550 Trader Rating: (0) Feedback Score: 0 reviews	clutch pedal pressure goes up and down i searched and couldn't really find anyone with the same problem so when my car is cold my clutch pedal is really soft and i have to push the pedal all the way to the floor for it to engage smoothly and not grind. Then as i drove around and the motor warmed up the clutch line, so i assume, the pedal got stiff and it caught near the top of the travel. been like this for some time now. i think hmmm, there must be air in the line somewhere, so i finally have the time and i proceed to bleeding the clutch to get the air out. bleeding was done and nothing, pedal is mushy and yet again must be pushed to the floor to get into gear, i am absolutely sure there is no air in the line, since i bled it 20 times. i drove it around to try and warm up the line and see if the heat would firm up the pedal like it did before. i didnt drive too much, but it seemed like it helped move the catching point up, but i cant be sure. i will have to see tomorrow when im less tired. i dont understand why there is no pressure until it warms up, and bleeding it did not help. it was working fine right before i bled it, nice and firm. so im assuming the MC and SC are fine. anyone have any ideas what might be wrong? also i dont have a clutch dampener since my car was auto before the clutch hardline is new from dealer and from hardline to slave is a stainless steel clutch line thanks for any help henry

03-06-2006, 11:06 PM	#3
krustindumm Zilvia Junkie Join Date: Dec 2004 Location: Iowa Age: 40 Posts: 473 Trader Rating: (0) Feedback Score: 0 reviews	master or slave cylinder may be leaking. Pull the dustboot back on the slave and look for fluid, if there is none, it's probably the master cylinder. __________________ ASE Master Technician

03-06-2006, 03:17 PM	#2
kouki_s14 Zilvia FREAK! Join Date: Jan 2004 Location: Los Angeles Posts: 1,550 Trader Rating: (0) Feedback Score: 0 reviews	anyone have ideas?

03-26-2007, 11:16 PM	#5
spirit Zilvia Member Join Date: Dec 2005 Location: california Posts: 272 Trader Rating: (3) Feedback Score: 3 reviews	Did you find your problem? I have the same damn problem, tho when its real cold (like below 50F) and my clutch is to the floor, I get rubbing like noise as well. Just had a bran new Exedy stage one clutch installed too.

04-18-2007, 03:37 PM	#6
DJ_Sunrise Zilvia FREAK! Join Date: Feb 2004 Location: NJ Age: 38 Posts: 1,134 Trader Rating: (1) Feedback Score: 1 reviews	i had that problem before as well.. it turned out to be one of three things.. i honestly cant remember which one tho... clutch slave, master, or just needed to be bled.. do all three, not too expensive and it will ensure reliability.

04-18-2007, 03:51 PM	#7
kouki_s14 Zilvia FREAK! Join Date: Jan 2004 Location: Los Angeles Posts: 1,550 Trader Rating: (0) Feedback Score: 0 reviews	thread is a year old guys, and yes i fixed the problem i just bought all new stuff. i was tired of dealing with it.