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Clutch Master and Slave Replacement

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    Hello,

    I plan to change the clutch master and slave cylinders on my 1996 Miata (69K miles baselining of the car).  There are no functional issues with either but the master reservoir oil is dark as opposed to honey color.  Will probably replace with Advanced Autozone LUK Clutch Master Cylinder Part No: I3000836031LUK and CARQUEST TECHnovation Clutch Slave Cylinder Part No: 360028, but would like to hear from anyone’s prior experience.

    This is not my daily car so I can take my time with it. Looks like master replacement will be easiest (easy access), with the slave replacement and bleeding more complicated by access. Thanks

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    Dennis, with no functional issues and the only concern is the ‘color’ of the fluid, replacing clutch slave and master is unnecessary.

    The clutch master cap is vented to atmosphere, which will cause the fluid to darken. A word of caution when check clutch fluid level, remove the cap and inspect. There can be dark residue on the inside of the reservoir that from the outside can look like the fluid level is OK.

    For baselining, flushing the fluid is all you need to do. The Club (See Joe Wall) has a Motive power bleeder that make the job easy.  Many Club members will flush both the brake and clutch fluids at the same time.

    Gerry

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    Thanks Gerry! Was originally concerned that dirty fluid was caused by master cylinder’s inner seals breaking down after 23 years of use.  In my 15 year old MSM, the master fluid is still mostly amber in color.

    Fluid level in the master is good. When I bought the car it was a little low (half mark) so I topped it off. Oil level remains good after 2 month/300 miles. Will keep an eye out for level on the reservoir dropping.

    Will try to make it to the next tech day. Thanks for the advice.

    Dennis

     

     

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    Dennis,

    If you had to add any fluid, you probably have a slave cylinder that has started to leak. Clutch fluid doesn’t evaporate. It went somewhere. If you squeeze the boot on the slave cylinder you may find where that fluid went.

    Gerry

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    Just checked. When I  squeezed the boot on the slave cylinder I was rewarded by a small squirt of fluid. Will try to look at it after jacking the car. Boot and body of the cylinder around the boot did not feel/look oily before squeezing.  Thanks for the tip. If I have to replace the slave, I may replace the master also. Non OEM master units are cheap and easier to replace than the slave.  Thanks for the help Gerry.

    Dennis

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    There are some who recommend replacing both master and slave, even if the master shows no signs of failure. Not something I would do.

    On my old ’93, I replaced several failed slave cylinders and never touched the master for over 170K+ miles.

    I’d be cautious about the quality of cheap aftermarket parts and recommend known brands only. Poor quality casting, machining and low quality rubber parts may not last as long as a quality brand part.

    If you follow a schedule of flushing the fluid every two to three years and the slave may never fail again.

    Gerry

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    Found the OEM clutch slave cylinder NA01-41-920C that fits 1990-2005 model years.  For aftermarket will look at the Exedy/Daikin 61-1100 from Goodwin Racing or Moss Miata 903-155.

    Bought the car 3 months ago and other than a few minor issues everything checks OK for a 23 year old car. Thanks for the advice.

    Dennis

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    just found this thread…Gerry has given good advice…and the Club has a Motive pressure bleed setup sitting here in my garage (Waterbury) that you are more than welcome to use.  I keep clutch master and slave units ‘in stock’…get these from NAPA

     

    Saturday is a work in the driveway day…feel free to stop over…this is a piece of cake job that will not take long

     

    Joe

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    Hello Joe,

    Thanks for the heads up. Unfortunately I am on the road this weekend.  I will contact you soon and we can coordinate on a future date. Looking forward to meeting some of the group. Have a great weekend.  Thanks

    Dennis

     

     

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    Hello Joe. D0 you have the slave and master for the 96 Miata that I can buy from you or should I get it from NAPA? Let me know when a day opens up for me to come over. My schedule is open most days and coming from Wallingford should be a short trip. Thanks

    Dennis

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    Dennis just left…new clutch master and slave and system flush…all good now.

     

    hopefully we will be seeing more of him…the 96 he has is GORGEOUS…and he also has an 04 Mazdaspeed

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    Thanks to Joe for the work on the car and great advice on future maintenance planned for the car.

    Looking forward to meeting folks at the Lime Rock AutoCross July 13th.

     

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