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Clutch Master Cylinder Question


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#1 rich_959

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Posted 19 May 2020 - 11:14 AM

Might be a daft question, but is there a better solution for the clutch master cylinder on late model minis? I took the reservoir off the cylinder on mine when tidying up a loads of parts, and it seems it has a small leak. It seems a strange design, the way the reservoir is held to the cylinder against the O ring - as if it's destined to leak. The O ring is a bit scabby, as is the metal face it sits against.

 

For £45 or so, I'll probably replace it, but just wondering if there's a better solution out there, or are they all this way? I've never before taken one apart or considered how they work, so as I say, may be a stupid question!! Keen to avoid any leaks on my new paint.



#2 nicklouse

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Posted 19 May 2020 - 12:22 PM

Not really for that price.

#3 rich_959

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Posted 19 May 2020 - 12:34 PM

Or if I were to spend a bit more? Is the older metal bodied one better, and can it be used on later cars?



#4 nicklouse

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Posted 19 May 2020 - 12:47 PM

It can be used. The bore size never changed.

#5 unburntfuelinthemorning

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Posted 19 May 2020 - 03:17 PM

Go for the old type, less to go wrong.   



#6 rich_959

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Posted 19 May 2020 - 03:32 PM

Thanks chaps. I think I'll go for the old one then - seems less likely to leak, looking at how the tank is part of it all. 



#7 big john

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Posted 19 May 2020 - 06:28 PM

Or, use DOT 5 fluid and if it leaks your paint will be shinier there, not melted!



#8 nicklouse

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Posted 19 May 2020 - 06:39 PM

Or, use DOT 5 fluid and if it leaks your paint will be shinier there, not melted!

But you will need to change the seals and put up with a spongy pedal.

 

It is *******



#9 big john

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Posted 19 May 2020 - 07:04 PM

He said he's buying new so... You obviously have never used DOT5. I've used it for clutch and brakes for years and my pedal is just as firm as with DOT3. It's only real drawback is slightly higher cost. But as the silicone tends to nourish the rubber the cylinders seem to last much longer. To each his own, just another option.



#10 nicklouse

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Posted 19 May 2020 - 07:59 PM

He said he's buying new so... You obviously have never used DOT5. I've used it for clutch and brakes for years and my pedal is just as firm as with DOT3. It's only real drawback is slightly higher cost. But as the silicone tends to nourish the rubber the cylinders seem to last much longer. To each his own, just another option.

Bit the seals in it even new are not suitable. 
 

yes I have used it. Yes I have put it in a few vehicles. And also removed it from a few. 
 

I would only ever put in a trailer queen or display car.



#11 big john

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Posted 19 May 2020 - 08:34 PM

The seals are perfectly suitable. However, this has been hashed over on a hundred (or more!) forums and never resolved. I suggested it to him as an option if he's worried about his paint.



#12 rich_959

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Posted 20 May 2020 - 08:28 AM

Thanks big John, I'll give it some thought!






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