Clutch pedal is sinking now but still disengages clutch

[Lopin18]

Weird, after my first drift practice i went to the beach, almost there i noticed my clutch pedal had sank, grabbed it up again and pumped once and got pressure again then it stayed good but when WOT the pedal would sink again..., didnt mind, yesterday was my second practice and i noticed the pedal was sinking a LOT, after like 30 seconds without touching the pedal it looses its pressure. running or not running, have to pull it up and pump to get pressure, still when its sink it still disengages the clutch fine, but its deep down there...

So, last time i had this problem wasnt PRETTY my clutch totally broke in half cause the transmission was tilted downwards, now it comes again and im really nervous.

I tried to bleed it i think i did it wrong ill try again, also i think its the slave cylinder dying right?

Are these the only 2 reasons that the pedal would sink like this? Thank you!

[scottydog]

Likely bad mc or slave. Look for leaks. Is the fluid level down? The mc leaks on the floorboard by the clutch pedal, the slave leaks under the rubber cover.

Remember there are two bleed points, takes awhile to bleed the system.

Might be easiest to do the big fix, replace mc and slave ($50) get rid of the dampener box, flush/bleed and you should be good to go.
Modified by scottydog at 10:57 AM 4/21/2008

[Lopin18]

No damping lines here, its direct, fluid is always on max, all good.... :S

[Rucca]

If the fluid is still max then you probably have an internal leak in your master cylinder

[Lopin18]

Ahhhhh ****..... that made my day , how can i test the master cyl?

so 3 options: Air in the system... Slave Cyl gone bad.... but the third one aint good man... Bad Master Cyl. master cyl is gonna be a pain to find here in Dominican Republic.

[Rucca]

I don't really know if there is an easy test for a MC besides disassembling it and looking at the components. Just try bleeding it first and make sure slave isn't leaking.

[scottydog]

Most of the mc or slave cylinder failures involve leaking. Look under the clutch pedal-if you see a spot that smells like hydraulic fluid that's it. Look under the rubber on the slave for the same thing.

Unless you bled it incorrectly the cause of air in the system is a leak...

[Lopin18]

Well! just dissasembled both cylinders, damn its such a SIMPLE mechanism.... got all the repair parts, and started checking my failure reason.....

Well couldnt find any problems, just the Slave cylinder wall had a scratch that could rip the gum inside..... so today i got both repair kits, gonna put the new pieces in today and test. i can imagine that the Cylinder itself would be damaged anyway, maybe one of the couplings on the hardline got loose or something... I hope the repair kit solves my problem

[Lopin18]

Cool!, took out both cylinders, dissasembled them, the slave had a lil scratch on the inner wall that i could feel, polished it by hand with a sandpaper, bought a repair kit for both like 5 bucks, put them in, bleed, damn! the clutch gets harder every day i use it! SWWWEEETTT Good stuff

[Rucca]

Good work

[scottydog]

That should do it. Sometimes it's just worn out rubber seals.