Slave cylinder or clutch bad?

[mantas]

I had a really weird thing happen to me and im not sure what caused this. About two weeks ago i stalled at an intersection and when i got the car started i punched it through the intersection and shifted up to 3rd or 4th. Then the clutch started to drop to the floor. I came to a stop and waited and all of a sudden the car drove fine again. I didnt notice any leaks by the slave and the reservoir was full. The car drives fine and pulls fine the revs dont surge but sometimes it feels like the clutch pedal becomes soft after a pull. Anyone know what happened? Did i overheat the clutch or what? When i did that pull at the intersection the road was really bumpy and my wheels hoped a bit. Car is an s14 with an rb25. Any help or insight would be greatly appreciated.

[Mikester]

Sounds like you need to utilize a clutch MC rebuild kit.

[mantas]

How do you know this? Ive never heard of one going bad, and would rather buy a new one if possible lol.

[Mikester]

Because every time mine and/or my friends' clutches started randomly sinking to the floor, it turned out their MC's needed to be rebuilt. If you want a whole new MC, go ahead and get one... rebuild kit is much cheaper and it's simple as hell to do.

[mantas]

Because every time mine and/or my friends' clutches started randomly sinking to the floor, it turned out their MC's needed to be rebuilt. If you want a whole new MC, go ahead and get one... rebuild kit is much cheaper and it's simple as hell to do.

Aha. That makes sense. Ill see if i can just get a rebuilt one or worst case ill buy new or do it myself. Thanks for the help, off to do some shopping.....haha

[ghoti]

Before anything check your slave cylinder, there's a bigger chance that's the problem. Autozone MCs and SCs are around $15 bucks each

[Mikester]

Check your fluid level. If you are losing fluid, then listen to ^^him^^. If not, rebuild the MC or replace it.

Also, check the clutch pedal bracket. They fail over time too.

[dawagarage]

you say you punched it and then noticed then noticed reduced pedal feel.
punched it = higher rpms = more heat
how old is the fluid in your system?
the very first thing i would do would be to bleed or completely replace the fluid, thats also the cheapest.
if the problem persists, rebuild the SLAVE cylinder first. as previously stated, those go out more often than the master cylinders.
if the problem still persists, THEN rebuild the MC.

you can look to the FSM for how to rebuild the cylinders.
also, i recommend buying a rebuild kit from nissan. slave is about $15, mc a little more. it's super simple.

[mantas]

Slave is definitely not leaking. But ill check both before i start tearing things apart.

[mantas]

Also my fluid is dark as hell, and i have a heavy duty clutch. Its a workout to drive, most people cant imagine how i dd the car lol. Well i will probably replace whichever part is bad. I can get either one for under $40 and i pick it up right across the street from my house. Yes i live next to the nissan dealer - lol.

[HyperTek]

Replace both of them and get a stainless steel braided clutch line. If i recall, there was some junk hard line box crap on the S13 that you can get rid of.

On my 7, I tried rebuilding both slave and master, and my slave worked great, but i somehow messed up the master during rebuild so i just ended up buying a new one, along with clutch line.

Worthy upgrade to do mentioned above with new fluid, and you should be good to go.

[ghoti]

Also my fluid is dark as hell...
bleed out the whole system, if it turns black again one of your seals is bad

i have a heavy duty clutch. Its a workout to drive, most people cant imagine how i dd the car
Do you still have the clutch dampener? that helps soften up the clutch pressure
Also if you wanna be fancy and are buying OEM stuff I suggest getting the Nismo slave, it really helps when you have something like a Stage 3 clutch

[mantas]

Replace both of them and get a stainless steel braided clutch line. If i recall, there was some junk hard line box crap on the S13 that you can get rid of.

On my 7, I tried rebuilding both slave and master, and my slave worked great, but i somehow messed up the master during rebuild so i just ended up buying a new one, along with clutch line.

Worthy upgrade to do mentioned above with new fluid, and you should be good to go.

I usually fuck something up when i rebuild things like this. I will get new and as for the line i already have a steel braided.

[mantas]

bleed out the whole system, if it turns black again one of your seals is bad


Do you still have the clutch dampener? that helps soften up the clutch pressure
Also if you wanna be fancy and are buying OEM stuff I suggest getting the Nismo slave, it really helps when you have something like a Stage 3 clutch

Goo idea. Ill bleed it first. I dont have a clutch dampening box anymore, and i might get a nismo this time. Did you notice a big difference between nismo and stock? I hear its not very noticeable but supposedly the thing is more durable.

[Mikester]

^^I ran an unsprung ORC twin plate in my GT-R back in the day. Talk about a workout to drive lol! Switched to a Nismo slave, and the pedal feel went from hard as hell to almost a stock feel. Nismo slave is expensive, but very much worth it if you have an upgraded clutch.

[mantas]

^^I ran an unsprung ORC twin plate in my GT-R back in the day. Talk about a workout to drive lol! Switched to a Nismo slave, and the pedal feel went from hard as hell to almost a stock feel. Nismo slave is expensive, but very much worth it if you have an upgraded clutch.

Shit. I guess ill try and get one then. Worth it in the end, and i cant stand it when i have to exit the freeway because i cant drive that clutch in traffic hahah. Its an ACT hdg6 unsprung - overkill for my needs but cheap and after three years of abuse works like its supposed to.

[dawagarage]

bleed out the whole system, if it turns black again one of your seals is bad


Do you still have the clutch dampener? that helps soften up the clutch pressure
Also if you wanna be fancy and are buying OEM stuff I suggest getting the Nismo slave, it really helps when you have something like a Stage 3 clutch

+1. it's an enclosed hydraulic system, which means it isnt exposed to contaminants. meaning the fluid is supposed to stay its original color and black fluid would mean there's a leak somewhere.

I usually fuck something up when i rebuild things like this. I will get new and as for the line i already have a steel braided.

youll have to learn sometime. sometimes fucking it up is the first step to getting it done right the next time around.

just buy the damn rebuild kits and dont fuck it up.

also, upgrade to dot 4 if you havent already.

[mantas]

+1. it's an enclosed hydraulic system, which means it isnt exposed to contaminants. meaning the fluid is supposed to stay its original color and black fluid would mean there's a leak somewhere.



youll have to learn sometime. sometimes fucking it up is the first step to getting it done right the next time around.

just buy the damn rebuild kits and dont fuck it up.

also, upgrade to dot 4 if you havent already.

Already ordered a master but ill try that the next time, i have to dd my car until i get my datsun on the road. And i did use DOT 4 last time around. I was really surprised to see the black fluid but ran into some corvette forum where people were saying it was normal so i figured it must be normal. Now i know, lol. And im quite positive its the master now. I told my friend about it and he said it can only be the master because the slave would leak and since he has been running mechanic shops for over 10 years i figured he should know.

[240pimp]

Just buy a new master and be confident that it works right the first time.

They arent that expensive.

[mantas]

Thats what i did. Fixed it and forgot to update the thread. All is well just have to adjust the clutch a bit more. Thanks for the help guys.

[Shift n Drift]

why are you guys saying its not that expensive?
i was on my way to Z1 Nationals and clutch started fucking up, (going to the floor) so after 8hours of driving, we pull over at a gas station, come to the conclusion it was the master, went to a autozone and picked up a MC, a SC, and a the hydraulic rubber line all for 53 bucks, went and changed all that shit and we ready to go another 4 hours an hour ana half after our conclusion

its cheap as shit just buy a new MC and SC and forget the rubber line cause you already said you have a braided, and after an hour ana half you should be good to go for another 5 years.

good luck

[jr_ss]

Autozone parts are shit, that's why it's not cheap if you do it with OEM quality parts...

[240pimp]

why are you guys saying its not that expensive?
i was on my way to Z1 Nationals and clutch started fucking up, (going to the floor) so after 8hours of driving, we pull over at a gas station, come to the conclusion it was the master, went to a autozone and picked up a MC, a SC, and a the hydraulic rubber line all for 53 bucks, went and changed all that shit and we ready to go another 4 hours an hour ana half after our conclusion

its cheap as shit just buy a new MC and SC and forget the rubber line cause you already said you have a braided, and after an hour ana half you should be good to go for another 5 years.

good luck

53 bucks is super cheap to replace all that stuff. Why would anybody rebuild at those prices?

[Shift n Drift]

you think they are prolly shit cause you might, or half the people that changed their slave or master never got a braided and still had the old rubber line that corrodes after time causing other parts to fail, its a plunger in a cylinder, and yes nismo are more expensive because its re-engineered to work the same yet give a softer clutch feel when with a super heavy duty clutch, i could only imagine how soft it would feel with a stock clutch

[h2v7]

^^I ran an unsprung ORC twin plate in my GT-R back in the day. Talk about a workout to drive lol! Switched to a Nismo slave, and the pedal feel went from hard as hell to almost a stock feel. Nismo slave is expensive, but very much worth it if you have an upgraded clutch.

yea def i have stage 2 unsprung 6 puck felt like a foxbody clutch hard as hell

got a new master, stainlesss line, and nismo slave

and it feels wayyyy better

went from like 8 out of 10
to 4 out of 10 as far as effort to push the clutch