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PSA: Replace those clutch masters and slaves

 
Old 07-07-2018, 12:04 PM
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Exclamation PSA: Replace those clutch masters and slaves

My car felt like it was losing some acceleration and it got worse as it heated up. Had trouble diagnosing it and was even about to pull the trans and clutch as I thought I might have glassed the clutch itself. After a bunch of reading on here it sounded like it may be the clutch master and/or slave going out. From what I read, they don't last very long and are hard to diagnose as they don't always leak when going bad. I'm pretty sure the pair were only about two years old and had about 4k miles on them.

Spent $18 total for a new Exedy Clutch Master and Slave on Rockauto. Took about an hour to swap out both and bleed the line.

The car is back to amazing and performing as good as ever. I'll be replacing the pair annually now. Thanks to everyone who posted up info about this, helped me a ton.

PS- don't forget to bench bleed the clutch master before install.
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Old 07-07-2018, 02:52 PM
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Yep. I replace the slave yearly. Master every other slave.

Ever Mazda i've ever had has had stupid short clutch hydraulic life.
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Old 07-07-2018, 03:11 PM
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How does an issue with the clutch hydraulics affect acceleration?
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Old 07-07-2018, 05:05 PM
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Originally Posted by SpartanSV View Post
How does an issue with the clutch hydraulics affect acceleration?
My clutch felt like it was slipping under hard acceleration. It wasn't horrible like if the actual clutch was bad, but enough to be noticeable. Maybe someone can explain the technical reason, but I think it has something to do with the fluid pressure not being as powerful as it needs to be.
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Old 07-07-2018, 05:16 PM
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Originally Posted by LukeG View Post
My clutch felt like it was slipping under hard acceleration. It wasn't horrible like if the actual clutch was bad, but enough to be noticeable. Maybe someone can explain the technical reason, but I think it has something to do with the fluid pressure not being as powerful as it needs to be.
The hydraulic system spreads the spinny bits away from each other to disengage the clutch. It does not push the spinny bits together to engage the clutch.
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Old 07-07-2018, 09:09 PM
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Originally Posted by SpartanSV View Post
The hydraulic system spreads the spinny bits away from each other to disengage the clutch. It does not push the spinny bits together to engage the clutch.
I don't know how to explain it then, but it is definitely engaging better. Is it possible for the slave to be messed up and not allowing full engagement?

edit: maybe it is the psychology of better pedal feel after the replacement.

Last edited by LukeG; 07-07-2018 at 10:19 PM.
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Old 07-07-2018, 09:32 PM
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Have you guys found one method of bleeding is better than another?
we have :
Power pressure bleeder
two person method
Reverse bleeding method
I heard reverse bleeding is used in the aircraft industry.
Anyway, if you've tried more than one way let me know what you think.
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Old 07-08-2018, 02:11 AM
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Originally Posted by LukeG View Post
I don't know how to explain it then, but it is definitely engaging better. Is it possible for the slave to be messed up and not allowing full engagement?

edit: maybe it is the psychology of better pedal feel after the replacement.
Yep. Placebo effect is where my money is.

All that said I fully agree that the miata master and slave cylinders are total ****.
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Old 07-10-2018, 04:34 PM
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I just replaced both on my car when the new engine went in. Its been my experience that the slave goes out much sooner than the master, but its good practice to replace both and its really easy anyways.
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Old 07-10-2018, 04:42 PM
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Originally Posted by andyfloyd View Post
I just replaced both on my car when the new engine went in. Its been my experience that the slave goes out much sooner than the master, but its good practice to replace both and its really easy anyways.
That's what research had told me as well so I only did the slave when my engine went back in. A few weeks later (with the car still on jackstands), the master leaked around the pushrod and into the car.
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Old 07-10-2018, 05:19 PM
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Originally Posted by 2manyhobyz View Post
Have you guys found one method of bleeding is better than another?
we have :
Power pressure bleeder
two person method
Reverse bleeding method
I heard reverse bleeding is used in the aircraft industry.
Anyway, if you've tried more than one way let me know what you think.
I've only ever had luck with the 2 person bleed method on any hydraulic system on any car I've owned.
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Old 07-10-2018, 05:57 PM
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First thing I thought when I read post #1- Thats not how our clutch works.
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Old 07-11-2018, 04:39 PM
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I hardly think the clutch master and slave are annual replacement items, unless you're somehow very hard on your hydraulics.
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Old 07-11-2018, 05:10 PM
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Originally Posted by ryansmoneypit View Post
First thing I thought when I read post #1- Thats not how our clutch works.
Yup, I'm a moron sometimes.
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