Clutch reservoir black sludge - dissolved 'o'rings?

alan richard · 25th February 2020, 12:02

Hi All.

A couple of years back I fitted a Tazu clutch master, all went well for some time.
Late last year the clutch is feeling poor so I bled new fluid which cheered it up.
The old fluid was a bit murky.

I've just bled it again - the fluid in the reservoir is properly black (though the fluid at the other end was fairly clean looking.)
The clutch is improved but it feels . . .hmm, not quite right.

I guess it is seals braking up.

Question is - what next?
Any advise on changing seals in these master cylinders?
Any clues as to size/ type/ quantity?

Answers and tips welcome.

Cheers

Alan

T-Cut · 26th February 2020, 09:45

O-ring abrasion is the cause of this. The deposit is a fine suspension of rubber dust. It was also an issue with the original clutch masters for sure. I believe the Tazu has been castigated for having similar problems. Over the years, the clutch master issue has been a thorny one and after various ventures away from OEM, the preference seems to have cycled back. At least that's what DMGRS says and he should know.

Link: https://www.dmgrs.co.uk/collections/...5480-stc000110

TC

alan richard · 26th February 2020, 11:59

Thanks T-cut. That was my conclusion.

Tazu did seem to be the saviour of R75 clutches for a brief spell.

Shame I've replaced the original pipework with the Tazu copper otherwise I'd have gone for the LHD replacement as your link.

Thorny issue indeed. I may approach Tazu and see if they can do an 'o'ring kit.

Ta.

A

25th February 2020, 12:02	#1
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	Clutch reservoir black sludge - dissolved 'o'rings? Hi All. A couple of years back I fitted a Tazu clutch master, all went well for some time. Late last year the clutch is feeling poor so I bled new fluid which cheered it up. The old fluid was a bit murky. I've just bled it again - the fluid in the reservoir is properly black (though the fluid at the other end was fairly clean looking.) The clutch is improved but it feels . . .hmm, not quite right. I guess it is seals braking up. Question is - what next? Any advise on changing seals in these master cylinders? Any clues as to size/ type/ quantity? Answers and tips welcome. Cheers Alan

26th February 2020, 09:45	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	O-ring abrasion is the cause of this. The deposit is a fine suspension of rubber dust. It was also an issue with the original clutch masters for sure. I believe the Tazu has been castigated for having similar problems. Over the years, the clutch master issue has been a thorny one and after various ventures away from OEM, the preference seems to have cycled back. At least that's what DMGRS says and he should know. Link: https://www.dmgrs.co.uk/collections/...5480-stc000110 TC

26th February 2020, 11:59	#3
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	Thanks T-cut. That was my conclusion. Tazu did seem to be the saviour of R75 clutches for a brief spell. Shame I've replaced the original pipework with the Tazu copper otherwise I'd have gone for the LHD replacement as your link. Thorny issue indeed. I may approach Tazu and see if they can do an 'o'ring kit. Ta. A