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Clutch occasional fault!

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Old Sep 13th, 2019, 18:58   #1
Dirty Rooster
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Default Clutch occasional fault!

1993 940 with hydraulic clutch.
It's happened twice now, clutch pedal to the floor, clutch engages but abruptly ... gives me palpitations ... few seconds later and the clutch is working normally as if nothing was ever wrong.
Once was in Aldi carpark going from reverse to first. I thought the cable had snapped! Then it was working again ... confusing.
Second time was a warm car, going from third to fourth gently, lowish revs, straight road. Less of a panic, hasn't happened since.

I'm going to have a look at the fluid as the first-stop to detect the problem,
I might want to buy some of that there really good synthetic modern stuff before I do ...

Recommendations here??
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Old Sep 14th, 2019, 11:44   #2
Laird Scooby
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Originally Posted by Dirty Rooster View Post
1993 940 with hydraulic clutch.
It's happened twice now, clutch pedal to the floor, clutch engages but abruptly ... gives me palpitations ... few seconds later and the clutch is working normally as if nothing was ever wrong.
Once was in Aldi carpark going from reverse to first. I thought the cable had snapped! Then it was working again ... confusing.
Second time was a warm car, going from third to fourth gently, lowish revs, straight road. Less of a panic, hasn't happened since.

I'm going to have a look at the fluid as the first-stop to detect the problem,
I might want to buy some of that there really good synthetic modern stuff before I do ...

Recommendations here??
Sounds suspiciously like the seals are going, either in the master cylinder or the slave cylinder. Not sure the price premium on synthetic fluid would be worth paying against the normal cost of a good quality DOT4 brake fluid. For the amount the clutch is used and the heat (not) produced, it wouldn't really benefit you any.
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Old Sep 14th, 2019, 22:31   #3
Dirty Rooster
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The brake fluid reservoir is still completely full, (smells of fish though)
Sam at the garage says the fluids are all Dot4, buy any of them.
I plan on draining the reservoir and refilling with fresh then bleeding the clutch only...
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Old Sep 14th, 2019, 22:43   #4
Laird Scooby
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The brake fluid reservoir is still completely full, (smells of fish though)
Sam at the garage says the fluids are all Dot4, buy any of them.
I plan on draining the reservoir and refilling with fresh then bleeding the clutch only...
Is the brake reservoir shared with the clutch? If so, don't drain it as you will introduce air into your braking system. Also if the fluid is that bad, i'd suggest renewing the brake fluid as well.

Have you got a Gunsons Easibleed? Makes life much quicker and easier, especially with ABS - you'll need about 2-2.5L of new fluid to do the lot.

If the fluid hasn't been changed in the past 2 years, i strongly advise you change it or it might not be just the clutch that gives trouble!
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Old Sep 14th, 2019, 23:39   #5
Dirty Rooster
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If the fluid hasn't been changed in the past 2 years, i strongly advise you change it or it might not be just the clutch that gives trouble!
Two years?
TWO YEARS??
Probably more like 22 ...
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Old Sep 15th, 2019, 00:10   #6
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Two years?
TWO YEARS??
Probably more like 22 ...
No wonder it smells of fish! In that time it's probably absorbed enough water to develop its own marine life microcosm in there!
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Old Sep 15th, 2019, 17:39   #7
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I should put it under the microscope and find new species!
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Old Sep 15th, 2019, 18:52   #8
Laird Scooby
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I should put it under the microscope and find new species!
Just when you thought it was safe to go back in the water! Sure there will be some alien life-forms in there!
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Old Oct 8th, 2019, 17:58   #9
Dirty Rooster
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Dammit I still haven't sucked out the old goop, replaced and bled it.
Need some peer-pressure.
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