Almost impossible to shift up or down or even reverse suddenly clutch to the floor?

Tiny
SHLBTWD
  • MEMBER
  • 2006 KIA OPTIMA
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 165,000 MILES
Clutch/cam shaft sensor?
Saturday, August 5th, 2023 AT 9:31 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Hi,

Does it shift normally with the engine off? If so and the pedal goes to the floor now, either we have a faulty clutch master cylinder, or the slave cylinder has failed.

Do me a favor. First, make sure the brake fluid is full. The brake master cylinder functions as the fluid reservoir for the clutch master cylinder (CMC). See pic below

Next, check around the CMC to see if there is any evidence of a leak. If you follow the supply tube to the transmission, it will lead to the slave (which I believe is internal on this vehicle). Check to see if there is evidence of fluid leaking in that area.

Let me know what you find.

Take care,

Joe

See pic below. Note: I have the arrow pointing toward the brake MC. The circled item is the clutch MC.
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Saturday, August 5th, 2023 AT 11:37 PM
Tiny
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Thank you so much for getting back to me. Sorry it's been such a long time before I got back to you, I'm just now able to look at my car and yes, it does shift regular in all gears with the ignition off l.
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Sunday, August 6th, 2023 AT 10:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Hi,

No problem whatsoever. If it shifts normally with the engine off, then the transmission or shift linkage isn't an issue.

That leaves the clutch hydraulics. Were you able to check the things I mentioned?

Joe
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Monday, August 7th, 2023 AT 1:02 PM
Tiny
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Yes, I did do some checking around those areas and from what I gathered and seeing I see no leakage anywhere.
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Tuesday, August 8th, 2023 AT 11:54 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
If that is the case, I suspect the clutch master cylinder is what failed. Not always, but often when the slave fails, they leak. Make sure the brake master cylinder is full.

As far as replacing the part, I attached the directions specific to this vehicle. Take a look through the directions and let me know if you have questions.

Take care and let me know what I can do to help.

Joe

See pics below. Note, the bleed procedure is included.
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Tuesday, August 8th, 2023 AT 9:33 PM
Tiny
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  • 34 POSTS
Thank you so much, I'll be in touch.
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Wednesday, August 9th, 2023 AT 12:43 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Hi,

You are very welcome. If you have questions, let me know.

Take care,

Joe
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Wednesday, August 9th, 2023 AT 8:52 PM

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