Mazin

First off ... i've searched before i post!
I was planning to take a trip for a bout 200 miles away .. so in the morning i checked the clutch fluid .. and it was bellow the "minimum" line .. no sign of leak! so i filled it up and drove it!
In the way, speeding 80mph ... i felt that the pressure of the clutch is very low .. and then somehow i managed to get back home safely with a low pressure in the clutch.
Someone advised me to bleed the clutch in case of having some air in... so i did it two times!
the last time, i bought a brake bleeder kit from autozone for $8 which can be used to bleed a clutch... and did it with a help of a friend.
the problem im having now is that the clutch looses it's pressure from time to time while driving the car. it usually loose it'e pressure of high speed... and im just too annoyed of that!
I checked the leak from clutch ... nothing!
I checked the slave cylender and it's working by seeing it moving while pumping the clutch.
What's am i missing?! I made sure there is no air in the cluch .. so why it's loosing the pressure and then gains it back when i park the car?!


Any help is really appreciated.
Thanks

nopistons

If there is no external leak and it's losing pressure, then the leak is INTERNAL, meaning that the fluid is escaping past the pistons/seals inside either the clutch master cylinder, or the slave cylinder, or both. The best solution is to change both cylinders, and the flexible hose which connects the two cylinders together. The cost will be under $100 for all three parts. There's really no way to tell if it's the master or the slave which is leaking, so you'll have to change both. But before doing any of this, BE SURE that there is no external leak.

Mazin

But... is the internal leaking the reason why the pressure is good untill i drive the car (in high speed) for a while?!
and if there was a leak, what should i do?
and do you know how hard of a job is it to change the master and the slave cylenders?

classicauto

iTrader: (3)

OK...

by lose pressure do you mean that after a long drive at high speed the clutch pedal is harder to push down? or easier to push down?

OR by lose pressure do you mean that the clutch starts to slip?

After depressign the clutch pedal, does the pedal return to its position (it comes back out) on its own? if not...does it return to its position slowly or not at all?

and if it is an internal leak there should be NO LOSS of fluid whatsoever....if its bypassing the master or slave why would it disappear? It doesn't.

sorry I just had a hard time understanding your explantion

eidt: master and slave for the clutch are not a HUGE deal....but a weekend job nontheless for an inexperienced fella

Mazin

well.. thanks for your reply buddy..
well.. i loose the pressure sometimes after 5 minutes and sometimes just when i get to the highway. By loosing the pressure i mean that the clutch goes all the way down! and sometimes it stays there unless i pull it back with my toes and start pumping to build up some pressure, and sometimes it just get low and i start pushing the peddle many times to be able to shift!

Yes, sometimes it does return normally and sometimes i have to pull it up by my feet (when i drive for longer time forgetting to pump it to keep the pressure)

a write up on how to change the slave and the master would be appreciated.
thanks

Mills604

When you say that you bled the clutch twice, do you mean you just turned the screw twice to let some air out? Or the other way round?

If you only turned that little screw twice, thats not enough to fully bleed the system..could be worth a shot as i had the same problem. I lost complete pressure in my clutch, popped the hood and clutch fluid was below the minimum. I filled it up, did an extensive bleeding and no problems since (1 month).

Mazin

i bleed the clutch very well with a help of a friend in two different days!
i let her pump the cluch while i opened the screw when the cluch is pushed down.. and repeated that till i noticed there was no more air in the system!

Mills604

Just thought i'd ask.
Someone else needs to take a stab at this one.

Mazin

up!

CoRDiTe

just putting my 2 cents. I had this problem recently about a month ago. I bled the clutch over 5 times. I still kept loosing pressure. I was also loosing fluid too. I rebuilt my slave cyl twice. Than my leak went away. bled the clutch again. When I take off and put pressure on the clutch. The clutch loses all pressure. I Rebuilt Master bled it again. Took off in the car to test it and lost all pressure. My problem was that even though i rebuilt my master cyl twice. My master cyl was just bad. I bought a new one and my problem vanished.

CoRDiTe

taking off the master cyliner isnt hard. taking off the slave isnt hard. They are both so easy. The master cylinder is only held on by 4 nuts. Just remove your coil ignitors which is held on by 3 nuts I believe or 4 go inside the car where your clutch pedal is and remove your master clutch which is being held by 4 nuts. Should take you less then 15 min to do so. Very easy job. install, repair or whatever your gonna do, reinstall Than bleed the clutch.