barely any clutch pedal preasure

[JDM 1JZ]

i was driving my car last night on the highway, i boosted a few times. by the time i got to where i was going my clutch felt funny. i had to push the clutch in halfway in order to feel any preasure in it. the next morning i went to drive home and slowly it got worse and worse to the point where i had to push it allllllll the way to the floor to get any kind of preasure(half an inch from and i couldnt get into any gears at that point) and the clutch would get stuck back to where the preasure starts and id have to pull the clutch the rest of the way up(because it was past the half way point of where the clutch springs) anyway the clutch master was filled, no visable leaking from there or the slave, i bled the slave and got half my pedal back enough to drive my car to my garage and i lost everything right when i got in my driveway... whats going on????

ps i replaced the slave a year ago and i read in an old post that grim jack said "the aftermarkets die after a year oppose to the OEM toyota" but i see no leaking anywhere could the slave have jsut stopped working, or is it my clutch? the car does have a whole new upgraded turbo set up and misc set up and i was on 20 lbs on a to4e 60 trim last night but the clutch wasnt slipping the night before

 

[daledoe]

It sounds like u need a clutch!! It was slipping the night befor u said right, and u have a after market turbo, do u have a stock clutch?????:dunno:

 

[Nick M]

If you have an internal leak, you wont see any on the ground, and it wont be low. The fluid will spill past the piston into the other chamber.

That doesnt happen with a JDM or 1JZ, because you just put it in and forget about it. So it has to be something else.

 

[SupraMario]

You need a new slave, my car did this, just replace the slave and u'll be good to go. its scary on the high way when ur clutch petal goes to the floor but doenst come back up.

 

[JDM 1JZ]

It sounds like u need a clutch!! It was slipping the night befor u said right, and u have a after market turbo, do u have a stock clutch?????:dunno:

i said the clutch was not slipping the night before

and as for the jdm 1jz nj wouldnt allow it, and the place i was going to get the car from turned out to be a scam...

 

[JDM 1JZ]

You need a new slave, my car did this, just replace the slave and u'll be good to go. its scary on the high way when ur clutch petal goes to the floor but doenst come back up.

i still had very very very very VERY little preasure in the clutch, not enough to engage or disengage the clutch though. so you think its def an internal leak on the slave? i mean i've broken a slave before and she went straight to the floor with out any preasure but she leaked everywhere and this one that i replaced a year ago is giving me problems now

 

[GrimJack]

Basically, the clutch hydraulics are very simple, there are only three things it could be.

In order of likelihood, the clutch slave, the master, and the line between them.

In your case, with having already replaced the slave, I'd check the master first - crawl under the dash and examine the firewall where the clutch piston goes through from the pedal. If it's wet on the firewall, the master is toast and needs to be replaced.

 

[SupraMario]

ive got my money on the slave, but it could be the master. do u have fluid leaking into the cabin down on the petal?
Bleed, Bleed, Bleed the system, till its nice and tight again.

 

[JDM 1JZ]

nothing is leaking in the cabin or the firewall, i bled the system out about 10-12 times and gained half preasure back and lost it again so i guess the slave has to be interally broken theres no leaks on the line either....

i thought my clutch was toast from the new set up at first but then i came to relize that that has nothing to do with pedal preasure. so i guess i'll change the slave again and test... the cars been sitting for about 5 months to if that helps and when i had half the pedal preasure back from bleeding the tranny shifted fine and clutch grabed fine, just crappy feeling pedal.. i had to bleed it in a parking lot to get it home and when i got right to my driveway she lost preasure again

 

[mrnickleye]

When a slave cyl. goes bad, it will leak fluid out on the ground (eventually). This is because it is the slave. If the seal goes bad, the fluid MUST come out to the world.

A slave's piston can seize in the bore (mine on 1969 Datsun 1600 Roadster, on fwy on-ramp at midnight). If it seizes in the out position, your clutch will be held open, and you won't be going anywhere.
If it seizes before you apply the pedal, you can't dis-engage the clutch. Your pedal won't go down.

When a master cyl seals goes bad (clutch or brakes) it will leak past the internal seal(s), and eventually will not apply hydraulic pressure to the slave(s). When this occurs, 2 things happen...

1) a leak outside the master will "eventually" be seen at the plunger rod from the pedal (brakes = at the mating surface of the booster and master)
This is due to the internal leak allowing fluid to slip past the seal and out to atmosphere

2) the pressure will not apply to the slave(s). This can be a gradual thing, or a sudden thing. You may not have a detectable external leak "yet".

So....I suspect the master (and not the slave), especially since you revealed that the car had been sitting for months.

PS. I am only trying to steer you in the right direction. If you came in to the shop, I'd have to charge you (gotta pay my technicians).
I've done a 100 or so when I was at Toyota for 5 years. Only mentioning this to give you some confidience in what to look for to get you going.
Let us know what it turns out to be.

 

[T701jz]

Master cylinder- 99.9% just in case

 

[JDM 1JZ]

okay so once a master is off the car how do i know if it is bad or not? same as to the slave but i guess i'll check the master first since ive done the slave before

 

[daledoe]

i said the clutch was not slipping the night before

and as for the jdm 1jz nj wouldnt allow it, and the place i was going to get the car from turned out to be a scam...

O my bad!!

 

[joeyd161]

i have been having the same problem since spring. I changed the master and slave cylinder got a little better then i changed the clutch and the pedal was perfect. Slowly the pedal is getting worse i bleed the thing like crazy and still the same thing. thinking about changing the slave and master cylinder again cause its still under warranty.

 

[Toycoma]

i have kind of the same problem on my W58 trans, pedal has presure but doesnt not fully return. only comes half way up. i have bleed it 4 or 5 times and it has been like this for over a year now. guess it is the slave cylinder but i have just never replaced it because i wasnt sure what the problem was.