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New Clutch Master Cylinder Defective??
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Ferenczy36
New User
Aug 21, 2014, 10:42 AM
Post #1 of 4
(1830 views)
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New Clutch Master Cylinder Defective??
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1999
Mazda
Miata MX-5
1.8 litre 4-cyl
81,000 miles
Old clutch master cylinder was leaking so purchased a new replacement. When bench bleeding the new master cylinder, noticed that when depressing the plunger, the internal spring was not always returning the plunger back to the close position. Is this normal?
Installed in car and unit works, however had a lot of trouble getting it to prime/pressurize by pumping the pedal. I actually was able to get a gravity feed started to the slave which bled the air out and got things working. However pedal has too much free play at the upper end, and the engage point could be adjusted a little. Going to adjust the linkage on the pedal but trying to figure out if this also may have something to do with the master cylinder and the plunger not fully returning to closed position. Thoughts?
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 21, 2014, 3:57 PM
Post #2 of 4
(1805 views)
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Re: New Clutch Master Cylinder Defective??
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I really don't think it is normal for the plunger to not return to the home position while your bench bleeding it. All the adjustment does is change the pedal height. Freeplay is automatically taken up by the clutch master.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 21, 2014, 3:58 PM)
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Ferenczy36
New User
Aug 21, 2014, 4:53 PM
Post #3 of 4
(1799 views)
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Re: New Clutch Master Cylinder Defective??
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I took the car to Clutch Mart (local transmission shop) as they offer free adjustments. Less than 5 minutes later, pedal adjusted. Things feeling a little more normal now, although it seems the clutch should fully engage a little sooner in the pedal travel. I was a little worried it may not be fully engaging, but did a couple of hard take offs and nothing is slipping so I think I'm all good.
If I do run into any more issues will be taking the master cylinder back and try another since it has a lifetime warranty on it.
Thanks!
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 21, 2014, 5:00 PM
Post #4 of 4
(1797 views)
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Re: New Clutch Master Cylinder Defective??
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Good to read you got it taken care of. Thanks for the follow up. Closed as solved and can be reopened upon request by the original poster. 
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 21, 2014, 5:00 PM)
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