Bonnet
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Hey all
I have a Deore brm-555 hydraulic caliper, and a deore lever and have had a lot of issues with air in the system. i have bled and re-bled it numerous times to a point where i am certain there is no air in the lines or trapped in the caliper and what not. the lever is nice and firm and braking conditions are normal. however if i pull the lever a little harder it will 'give' and eventually (after pulling the lever hard 6 or so times) i will now be able to touch it on the handle bars. i then go to re-bleed it and there is air again (5 mins after the previous bleed).
what im thinking is that, somehow it is drawing air into the system from somewhere, after a bit of trouble shooting i think i've narrowed is down to the lever. im not sure whether air is coming through from the olive and hose side, or through from when the piston in the lever is actuated. when i squeeze it hard it makes a creaking sound, as well as a squelching sound. almost as if sucking air in BUT when i greased the pivots this sound disappeared too, so im not entirely sure if this was a contributing factor.
what do you guys think? is it time for a new lever? or just reinstall the system, new olive and all. also, do you have to use shimano specific olives, or will any brake kit olive do (ie from super cheap or Repco auto)?
Cheers
ASH
its a bummer because now i cant ride this weekend! :evil:
I have a Deore brm-555 hydraulic caliper, and a deore lever and have had a lot of issues with air in the system. i have bled and re-bled it numerous times to a point where i am certain there is no air in the lines or trapped in the caliper and what not. the lever is nice and firm and braking conditions are normal. however if i pull the lever a little harder it will 'give' and eventually (after pulling the lever hard 6 or so times) i will now be able to touch it on the handle bars. i then go to re-bleed it and there is air again (5 mins after the previous bleed).
what im thinking is that, somehow it is drawing air into the system from somewhere, after a bit of trouble shooting i think i've narrowed is down to the lever. im not sure whether air is coming through from the olive and hose side, or through from when the piston in the lever is actuated. when i squeeze it hard it makes a creaking sound, as well as a squelching sound. almost as if sucking air in BUT when i greased the pivots this sound disappeared too, so im not entirely sure if this was a contributing factor.
what do you guys think? is it time for a new lever? or just reinstall the system, new olive and all. also, do you have to use shimano specific olives, or will any brake kit olive do (ie from super cheap or Repco auto)?
Cheers
ASH
its a bummer because now i cant ride this weekend! :evil: