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Clutch life depends on riding style/enviroment:
If you go for gentle Sunday rides in the country they might last 35k miles or more,
If you commute in a city, traffic lights might reduce this to 15k miles,
If your name is Carl Fogarty they last about 90 minutes.
Fluid should be changed at least every 2 Years.
How long had bottle been opened 1year ago?
Potential for air in system
Disc pack height the important measurement here, some kind anorak ;-) will give us a number shortly, haven’t checked one lately so would need to look up.
Sounds like you’re describing air in system.
Slip? you mean smooth release?
1cm is a lot, do you mean 1mm?
Brake fluid v.hygroscopic (absorbs moisture from atmosphere)
Hence 2 year service schedule. Water boils at 100c (@1bar), steam
is gas (not air) same effect.
Don’t keep opened bottles of DOT4. Buy smallest bottle you can.
Take all bottles open more than 1 month to local recycling.
Write date on bottle when you open.
Vapour lock in brakes much scarier!
My bet is bleeding will fix, Albie’s method may or may not work... explanation complex.
Exhausts & plugs... whole other thread.
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