Why does the 1200GS use mineral oil in the hydraulic clutch circuit?
Clutch fluid
- Thread starter Engineer
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alimey4u2
Registered user
Effort X Distance travelled = Load X Distance travelled
Therefore to gain any mechanical advantage over a cable system, (without a servo) the ability of the fluid to transfer energy efficiently becomes the critical factor....
Therefore to gain any mechanical advantage over a cable system, (without a servo) the ability of the fluid to transfer energy efficiently becomes the critical factor....
Effort X Distance travelled = Load X Distance travelled
Therefore to gain any mechanical advantage over a cable system, the ability of the fluid to transfer energy efficiently becomes the critical factor....
I know why it needs hydraulic fluid - but why mineral oil in the 1200GS?, the 1150 uses brake fluid and so did all of my previous bikes.
alimey4u2
Registered user
Dunno....
Neither do I - that's why I asked the question
just curious and thought that there might a genius here that could tell me. Must be a reason for BMW to change from brake fluid to mineral oil.
alimey4u2
Registered user
A little further research shows that mineral oil is not hygroscopic & therefore more stable....
araspitfire
Registered user
Brake fluid, is used when needed because it is designed to work (at the bottom end of the system) when things get crazy hot... (imagine someone riding the brakes down a long steep hill) But it degrades over time...
In the clutch system it doesn't get hot anywhere... so they use a fluid that doesn't degrade due to moisture ingress... Plus it doesn't wreck your paint...
I view it as an example of thinking outside the box and making something a little better...
Al...
In the clutch system it doesn't get hot anywhere... so they use a fluid that doesn't degrade due to moisture ingress... Plus it doesn't wreck your paint...
I view it as an example of thinking outside the box and making something a little better...
Al...
nedflanders
Registered user
It's probably why they fit a cap you can't actually remove, if you put brake fluid in, it buggers the seals making them swell, seen it done on a JCB brakes and it wasn't pretty when they all locked up
Mind you if theres no leaks and the clutch fluid rises as the plate wears there should never be a need to top it up until replacement time
Mind you if theres no leaks and the clutch fluid rises as the plate wears there should never be a need to top it up until replacement time
alimey4u2
Registered user
Thats why I use DOT 5 silicone in my "Performance Machine" brakes on my other bike....
Kind of makes sense, better performance and less maintenance into the bargain - engineering progress, another reason why the 1200GS is an improvement over the older bikes
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