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Old 11-05-2004, 11:24 AM   #1
 
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clutch master cylinder failure?

What are the signs of clutch master cylinder failure?

My clutch master cylinder isnt leaking, but when i take a semi-hard right turn, in neutral it dies and the clutch feels "empty" and when in gear it sometimes sputters, but the clutch feels "empty" as well. By "empty" i mean that there is no pressure at all. anyone have any ideas or insight? thanks!!!!!

-btek


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Old 11-05-2004, 11:25 AM   #2
 
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i know it's not the slave cylinder, because this problem has persisted through about 5 new slave cylinders.
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Old 11-05-2004, 11:21 PM   #3
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Does the master cylinder have enough fluid?
Why have you replaced 5 slave cylinders?
How many miles on the car, clutch, master cylinder, slaves?
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Old 11-06-2004, 08:23 PM   #4
 
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well, i had to pull the engine out a few times, and every time I change the slave cylinder. Plus I've had one of the screws that holds the slave cylinder break on me twice, since then I've upgraded the screws to stainless steel. the car has about 80k miles on it, and the clutch master cyl has never been changed. I dont know if the clutch master cyl has enough fluid, but the container in the engine bay is full. The clutch has about 35k miles on it, and i've replaced the clutch disc once. I have a clutch with 1800 (or 2100, im not sure) pounds clamping force. I've never read anything about clutch master cylinder failure and I am curious as to why it goes limp. thanks for the help. keep it coming. :)
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Old 11-06-2004, 11:38 PM   #5
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Sounds like you could have some air in the hydraulic system. You might want to try bleeding the clutch to see if it gets any better. Other than that I don't know what else to tell you. Maybe a pressure plate problem? When the Master cylinder goes out it leaks brake fluid all over your pedals, i've dealt with this several times on a few foci. Keep us updated. Good luck
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Old 11-07-2004, 12:54 AM   #6
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I agree, you may just have some air in the system. Especially since you've had it apart a few times when replacing the slave cylinder. Did you bleed the system properly after each slave?
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Old 11-07-2004, 01:00 AM   #7
 
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Yes, everytime i replaced the slave it was bled thoroughly. But i will checkk the master cyl, and try bleeding it again. thanks!!!!
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Old 11-07-2004, 10:29 AM   #8
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To test the master cylinder:
With engine OFF, push on the brake pedal and hold with steady pressure. If the pedal slowly goes to the floor, the master is bad. This test should work even with air in the system. The air will only make it feel less firm.
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Old 11-07-2004, 11:40 AM   #9
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Quote:
Originally posted by DidHeFocus?
To test the master cylinder:
With engine OFF, push on the brake pedal and hold with steady pressure. If the pedal slowly goes to the floor, the master is bad. This test should work even with air in the system. The air will only make it feel less firm.
you must not be familiar with the focus brake and clutch system. The Brake has its own pump and the clutch has its own mastery cylinder right above the clutch pedal. The brakes and clutch share the same reservoir, thats why the clutch uses brake fluid also. So if the clutch mastercylinder goes bad, the brakes will still work fine. The clutch has a slave cylinder int he tranny itself and a master cylinder inside the car. just some info for you.
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Old 11-08-2004, 08:59 AM   #10
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Thanks for catching that greystealth.
Sorry, but my brain went to sleep for a minute and when it woke up, it switched to BRAKE master cylinder.

That's still a good way to check the brake master cylinder.
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