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my new set of R1`s refuse to work with equal movement on both pistons. i have bled them several times and cant get them to work well. most if not all of the movement is on the side that the hose connects on and they are doing it the same on back and front. anyone solved it or am i just going to have to put up with it? i am a time served engineer and very capable at bleeding brakes but these have got me stumped. i have seen quite a few threads with peeps with the same prob but not found the miracle cure yet. is there one???
My Elixirs do this sometimes,fixed by taking pistons out,cleaning housing and regreasing seals.
Brand new? Mostly likely just need to bed in a little. Bleeding won't help it, it's just that one piston is stiffer than the other.
Could be they're actually outright defective but if they're so new I'd give them time.
its a bummer as had several sets of r1`s and never had a prob with them. they have only done 20-30 miles but if the piston is not moving then time will only make it worse if anything where its not moving and not bedding itself in.
i think i am going to completely dismantle them in the morning and pop the pistons out and see if i can see anything.
Why not take them back to where you bought them from?
i got them off ebay from italy. i will have one more good go at them and then will look into that.
Are they the old model ones in the sale? They'll have been sat around for a while if so.
Have you tried holding the more active piston in place, and using the pressure to push the sticky one?
I'd do that a few times, as it could just be that the seal's a bit dry/stiff on one side.
As Northwind says, they may have been sat around for a while, so one of them might just need to get moving again.
yes i did hold the good side and when you do the other side moves perfectly well until you let go of the other. they are the latest model.
OK, question- when you say "hold the other side" are you doing that by hand, or blocking it with a gclamp/allen key or similiar?
g clamp
i had a new set like this a few years back, took the lbs ages to sort, i think it was something to do with the cable end holding the fluid and the connection to the mechanism /calliper right after the entry point into the said caliper. sorry i dont know the details. certainly if one side moves ok when the other is held, its nothing to do with the piston operation/
roady_tony - Membercertainly if one side moves ok when the other is held, its nothing to do with the piston operation/
How not?
appreciate the input roady_tony but you got me stumped with that exp`?
sorry to confuse,
where the hose went into the caliper was the issue, not the piston.
IMHO if one piston held in and the other moves ok, then i dont see how it can be a piston issue,
perhaps try it with another lever/hose combo and see if the problem is the same?