PSA: Replace those clutch masters and slaves - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata
Sponsored By:
Sponsored By:

Reply
 
 
 
LinkBack Thread Tools
Old 07-07-2018, 12:04 PM   #1  
Junior Member
Thread Starter
 
Join Date: May 2017
Location: Austin, TX
Posts: 399
Total Cats: 36
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.
LukeG is offline   Reply With Quote
Old 07-07-2018, 02:52 PM   #2  
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 9,251
Total Cats: 1,072
Default

Yep. I replace the slave yearly. Master every other slave.

Ever Mazda i've ever had has had stupid short clutch hydraulic life.
concealer404 is offline   Reply With Quote
Old 07-07-2018, 03:11 PM   #3  
Junior Member
 
Join Date: Apr 2017
Location: South Dakota
Posts: 261
Total Cats: 18
Default

How does an issue with the clutch hydraulics affect acceleration?
SpartanSV is offline   Reply With Quote
Old 07-07-2018, 05:05 PM   #4  
Junior Member
Thread Starter
 
Join Date: May 2017
Location: Austin, TX
Posts: 399
Total Cats: 36
Default

Quote:
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.
LukeG is offline   Reply With Quote
Old 07-07-2018, 05:16 PM   #5  
Junior Member
 
Join Date: Apr 2017
Location: South Dakota
Posts: 261
Total Cats: 18
Default

Quote:
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.
SpartanSV is offline   Reply With Quote
Old 07-07-2018, 09:09 PM   #6  
Junior Member
Thread Starter
 
Join Date: May 2017
Location: Austin, TX
Posts: 399
Total Cats: 36
Default

Quote:
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.
LukeG is offline   Reply With Quote
Old 07-07-2018, 09:32 PM   #7  
Senior Member
iTrader: (4)
 
2manyhobyz's Avatar
 
Join Date: Feb 2011
Location: Joliet, IL
Posts: 632
Total Cats: 16
Default

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.
2manyhobyz is offline   Reply With Quote
Old 07-08-2018, 02:11 AM   #8  
Junior Member
 
Join Date: Apr 2017
Location: South Dakota
Posts: 261
Total Cats: 18
Default

Quote:
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 ****.
SpartanSV is offline   Reply With Quote
Old 07-10-2018, 04:34 PM   #9  
Junior Member
 
Join Date: May 2017
Posts: 260
Total Cats: -41
Default

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.
andyfloyd is offline   Reply With Quote
Old 07-10-2018, 04:42 PM   #10  
Junior Member
 
Join Date: Apr 2017
Location: South Dakota
Posts: 261
Total Cats: 18
Default

Quote:
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.
SpartanSV is offline   Reply With Quote
Old 07-10-2018, 05:19 PM   #11  
Elite Member
 
Join Date: Oct 2011
Location: OKC, OK
Posts: 2,928
Total Cats: 85
Default

Quote:
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.
z31maniac is offline   Reply With Quote
Old 07-10-2018, 05:57 PM   #12  
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 2,751
Total Cats: 277
Default

First thing I thought when I read post #1- Thats not how our clutch works.
ryansmoneypit is online now   Reply With Quote
Old 07-11-2018, 04:39 PM   #13  
Junior Member
iTrader: (1)
 
Join Date: Jul 2014
Location: Kensington, MD
Posts: 445
Total Cats: -25
Default

I hardly think the clutch master and slave are annual replacement items, unless you're somehow very hard on your hydraulics.
huesmann is online now   Reply With Quote
Old 07-11-2018, 05:10 PM   #14  
Junior Member
Thread Starter
 
Join Date: May 2017
Location: Austin, TX
Posts: 399
Total Cats: 36
Default

Quote:
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.
LukeG is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Always replace those 10mm crankshaft pulley bolts after 60,000 miles or timing belt. Cody Strife Engine Performance 20 05-14-2017 01:27 PM
Mixing and matching brake masters and boosters TalkingPie Suspension, Brakes, Drivetrain 15 06-29-2015 02:04 PM
Clutch Masters User Review Moffitt Suspension, Brakes, Drivetrain 1 03-09-2012 08:20 PM
I now need some serious help from the turbo masters TURNS101 DIY Turbo Discussion 56 01-28-2010 10:13 AM
replace or not replace miatauser884 Insert BS here 7 11-19-2009 02:08 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:41 AM.




We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.