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Old 07-02-2007, 10:30 AM   #1
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Default slave cylinder problem? help please!

I need a little help.

still kinda new here so I'd appreciate the help.

I have a 93 1.6 miata that is fully built with 60 trim turbo

I had some problems shifting. it was hardd to get in gear at times and when it was in gear, even with the clutch down, the car would roll slowly as if it was in gear.

I replaced the slave cylinder and that fixed the problem. smooth shifting. perfect everytime.

that was about 5-6 weeks ago. the problem has come back.

my question. can a slave cylinder go bad that quickly? maybe it's something wrong with my lines? maybe too much heat?

I checked the resevoir and fluid is not low. do I already need a new slave cylinder? (the used a factory one for replacement)

any help would be appreciated. thanks!
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Old 07-02-2007, 01:09 PM   #2
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Try bleeding your slave cylinder again real good. It is possible that you got some air in the line, possibly related to the heat. Well you are down there look at the slave cylinder and see if it is leaking or if there is fluid getting inside of the plunger. You might have gotten a defective one. I spent about 5 bucks on a rebuild kit for mine and it hasn't given me anymore problems for quite a while now.
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Old 07-02-2007, 01:13 PM   #3
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does the tranny grind under acceleration. If so the synchros could be wearing. You might need to try double clutching and rev matching and see if this solves the problem, if not then it is air in the lines.
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Old 07-02-2007, 02:33 PM   #4
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Don't forget, rebuild kits are $15 or less so don't go spend $80 on a new one.
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Old 07-02-2007, 02:37 PM   #5
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80 bucks from where autozone has them for 35 all day long. the master is expensive though
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Old 07-02-2007, 02:37 PM   #6
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http://forum.miata.net/vb/showpost.p...79&postcount=9

I don't recommend rebuilding a master or slave cylinder that has already failed. I would replace them. However, rebuilding a cylinder before it fails, IMO, is a fine idea.
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Old 07-02-2007, 02:40 PM   #7
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Wonder how long my master rebuild will last. We'll see.
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Old 07-02-2007, 03:22 PM   #8
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I replaced my master and slave for about $45 and 35, respectively from NAPA recently. When they're that cheap, why would you bother spending the time and money on rebuilding them?
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Old 07-02-2007, 03:35 PM   #9
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Because a rebuild kit is $15 and isn't hard to do

$15 x 2 $45 + $35
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Old 07-02-2007, 03:41 PM   #10
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fluid was a little low in the resevoir. I'll be replacing the master soon. hope that fixes it!

is there anyway to tell if it's the master before replacing or fixing? any better way to diagnose before replacing?

thanks
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Old 07-02-2007, 04:13 PM   #11
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So you'd be willing to save $35 on the chance the internal scoring of the cylinder walls is so bad that they still leak after rebuilding, causing you to end up buying the new part anyway?

After 16 years, I figure spending a few bucks on replacing wear items isn't such a bad idea...but apparently I'm in the minority ;-)
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Old 07-02-2007, 04:16 PM   #12
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No, not at all. I have a hone. And don't mind spending $30/yr to rebuild the cylinders. Again, I think it's a good idea to proactively rebuild the working cylinders. And a bad idea to rebuild them once they've been contaimenated. I think we're on the same page.
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Old 07-02-2007, 04:57 PM   #13
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Awesome...I'm glad we're still friends
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Old 07-11-2007, 07:41 PM   #14
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master replaced. but now I find that the line is leaking. how hard is it to replace the whole line? the one that goes from the master to the slave? is that part called the clutch line?
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Old 07-11-2007, 07:57 PM   #15
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not hard, its not very long.

hardline from master to passenger side firewall, then flexhose to mount on tranny, then to looped hardline on slave.
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Old 07-11-2007, 11:02 PM   #16
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is the part called a clutch line?
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Old 07-11-2007, 11:19 PM   #17
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I think I misdiagnosed the problem. what I do know

- slave cylinder replaced and problem fine
- month later, problem comes back
- replace master cylinder

- then I think I have a leak in hose

hose wouldn't just go bad.

- so I think the master cylinder doesn't match with exisitng line?

maybe there is a leak somewhere? I used tokico clutch master cylinder.

so my question? where is the leak? the line shouldn't just go bad. so it must be because it doesn't match with the master?

how can I diagnose and does that sound more reasonable?

thanks
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Old 07-12-2007, 01:50 AM   #18
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might want to check the slave again, i had that problem in my 240 to find out the boot was letting the fluid leak out when compressed. $15 at autozone fixed it though. have you checked the resevoir?
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Old 07-12-2007, 10:14 AM   #19
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I don't recall putting anything on between the master cylinder and the firewall. is there some kind of gasket that goes there? would this cause a leak? if so, there still is not leak in the engine bay, just all under the car
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Old 07-12-2007, 10:23 AM   #20
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either the soft line has a crack, or the slave is bad again.

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