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Hydraulic Clutch - Interesting Problem
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southcott
Novice
Apr 19, 2020, 1:17 PM
Post #1 of 12
(2497 views)
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Hydraulic Clutch - Interesting Problem
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Thank you everyone in advance for your advice and thoughts. I have a 2007 Hyundai Elantra that I bought in college, and the clutch went out on my in Feb 2020. I took the car apart in my garage and replaced the clutch, fly wheel, throw-out bearing, and pressure plate. I also replaced the master cylinder and the slave cylinder. In order to do this I removed the sub frame and trans-axle assembly on the front of the car (I don't have an engine hoist).
Here is the problem: When I get into the car, the clutch slides smooth and feels great. I noticed when I was driving after 20/30 min that when I would be stopped, and would press the clutch pedal in all the way to disengage the transmission, if I had the car in first I could feel a little vibration (like it was starting to catch). Now, when I am first in the car, I don't get that vibration when the clutch pedal is fully depressed. I'm trying to understand what could be the problem. I've already re-bled the hydraulic clutch at the slave cylinder to make sure there wasn't any air in the line. The clutch and brakes share the same reservoir in this vehicle and I don't see any noticeable drop in fluid. I'm worried something isn't right in the hydraulics and the clutch isn't fully disengaging the transmission from the engine after driving the car for 15-20 minutes. I think the pressure on the throw out bearing will cause it to fail after some time, and I'd rather not take apart the transmission again anytime soon. After the car sits for a day, I get back in and depress the clutch pedal and can put the car in first without any catching or vibration.
On another note, I will say my gear stick seems to be more sluggish than it was when before I did the project. I don't think that is the end of the world, but I suppose any details I give may help.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 19, 2020, 2:22 PM
Post #2 of 12
(2488 views)
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Re: Hydraulic Clutch - Interesting Problem
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This site has a specialist hope he'll be by soon. In the meantime to clarify complaints now try to use terms that I find used by techs to mix with DIYers or non professionals.
Vibration when engaging if/when so I call "chatter" not vibration.
I'd like to stay out but say that bleeding hydraulic clutches is a pest on many. That and just in two weeks not here rather a phone thing was poor parts that failed out of the box new! That and in the course of invasive work in general did anything stress other things out for clutches discs can be oily quick but you were there see that or bent upon install call that warped you get very lousy feel is worse with some heat of use. Goes for friction things in general which this is,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 19, 2020, 3:15 PM
Post #3 of 12
(2486 views)
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Re: Hydraulic Clutch - Interesting Problem
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It sounds to me like you still have air in the system. These clutches can be nearly impossible to thoroughly bleed because the bleeder is at the bottom and the air rises to the top.
Using a pressure bleeder would be helpful. Sometimes just sitting there and pumping and pumping the clutch pedal will migrate then air out the top.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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southcott
Novice
Apr 19, 2020, 4:18 PM
Post #4 of 12
(2475 views)
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Re: Hydraulic Clutch - Interesting Problem
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Thanks for your response. I cleaned the fly wheel and the pressure plate with brake cleaner and put on fresh gloves before putting the parts together, so I don't think I had any grease on the clutch. As far as parts that bent on the install, I don't believe so, and I think the change in behavior (smooth without any chatter initially, and then later on chatter) would be indicative it is an issue with the hydraulics. I hope that the Master and Slave weren't bad out of the box!
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southcott
Novice
Apr 19, 2020, 4:20 PM
Post #5 of 12
(2472 views)
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Re: Hydraulic Clutch - Interesting Problem
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Thanks for the thoughts Hammer Time - I had suspected the same, however haven't bought a pressure bleeder but that sounds like the next step.
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 19, 2020, 4:23 PM
Post #6 of 12
(2468 views)
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Re: Hydraulic Clutch - Interesting Problem
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I wouldn't buy one. It would be cheaper just to pay a shop to do it. A good pressure bleeder with adapters can run $500
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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southcott
Novice
Apr 19, 2020, 4:26 PM
Post #7 of 12
(2464 views)
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Re: Hydraulic Clutch - Interesting Problem
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Good to know - Thanks - I will have the shop do it.
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gsferraro
Veteran
Apr 20, 2020, 5:08 PM
Post #8 of 12
(2415 views)
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Re: Hydraulic Clutch - Interesting Problem
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Hello,
Agree with Hammer, you probably have air trapped in the line. Gary
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southcott
Novice
Apr 22, 2020, 4:02 PM
Post #9 of 12
(2383 views)
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Re: Hydraulic Clutch - Interesting Problem
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Thanks - I just realized after watching a video on this, that I didn't bench bleed the clutch master cylinder before putting it into the car. Are we saying that is probably what is causing this?
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 22, 2020, 4:46 PM
Post #10 of 12
(2378 views)
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Re: Hydraulic Clutch - Interesting Problem
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No, bench bleeding a clutch master doesn't make much difference. It's just very hard to get all the air out because rises to the top and the bleeder is at the bottom.
It has to be either pushed out the bottom with extreme force or it migrates to the top through the master.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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southcott
Novice
May 4, 2020, 8:37 AM
Post #11 of 12
(2169 views)
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Re: Hydraulic Clutch - Interesting Problem
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Hey all - Just a quick update. Last weekend I was manually pushing in the slave cylinder and noticed a slurping sound. There was a tiny hole in the hydraulic line near the slave cylinder that sounded like it was slurping in a little air when the cylinder was being pumped. I replaced the line and have been on a few long drives and I don't have anymore issues.
Thanks everyone for your responses and insights. Really appreciated it.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 4, 2020, 8:55 AM
Post #12 of 12
(2165 views)
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Re: Hydraulic Clutch - Interesting Problem
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Glad to hear it.
Closing now as solved
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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