Holes in master cylinder

mauricejota7604

mauricejota7604

Hero member
Location
Victoria Australia
Hello I have been having some issues with the clutch master cylinder on my 120 Jota and thought I would follow the suggestion made by others and move away from brake fluid and trial the light mineral oil as used in the KTM clutches, after a few days I noticed the spool seemed to be very slow to return until it didn"t return at all, it seemed as though the rubbers had swelled I guess the rubbers are not compatible with the mineral oild which dissapoints me, but my main question is there are two small holes at the base of the resevoir one about 2-3mm or so the other one a very fine hole less than 1mm what is the purpose of the smaller hole??? ??? ??? ??? ???
Thanks,
M
 
As well as being no good for brake operation, it will also cause poor clutch actuation - as Keith pointed out (& fixed!) on my RGS  :-[  So I can advise that bleeding isn't enough...you need to properly clean the reservoir to get rid of any sediment and also check the two holes are clear.
 
hi
i would suggest it would be better to strip down the entire system and renew all the seals as you have introduced a new fluid into the system that was not compatible.
Neale
 
Whilst I have no experience with Lav clutch hydraulics I do have experience with hydraulics and hydraulic fluids.

I am not ware of what issues you are suffering to cause you to go away from brake fluid but not all brake fluids are the same. If you are suffering pressure issues or the clutch not disengaging, possibly due due to sticking pistons then may I suggest you try DOT 3. Yes it is old, yes it should be replaced more often than the fancy new stuff but it is glycol based. This means it is slippery and less prone to sticking pistons.

Just an option.

Cheers

Rod
 
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