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Just changed the pads in my xt calipers (m765) but when trying to refit the wheel i cannot slot the disk in. There is a gap and the pistons look evenly spaced. The pistons will retract but as one goes back the opposite comes out more. Help.....
Could it be fluid pressure or the bite point at the lever stopping the pistons being able to be pushed back flush?
They should move fairly easily in and out.
Try pushing one piston all the way in, then push the other one whilst hold the first one in. If it doesn't want to go in, try levering from a different point so the piston is going in squarely.
If one wont move easily you may have a stuck piston. Fear not, they're easy to sort.
Take the pads and the wheel out. Drip some MINERAL brake fluid around both pistons, then GENTLY work the pistons out by pulling the lever. Push them back in (I find a plastic tyre lever ideal for this), then using the tyre lever to hold one in, pull the lever GENTLY again pushing the piston out a bit. Repeat for a number of times, but dont let the piston come out more than about 4mm to be safe.
You'll notice the oil around the piston start to get a bit black after a bit, wipe this off and drip some more fluid on.
Once its fairly clean, repeat for the other piston.
You should find they are a bit smoother in operation now.
Cheers bigyin
Is it worth loosening the resevoir cap to ease pressure and slacken the bit point adjustment do you think?
Indeed take the reservoir cap off. There is no bite point adjustment on M765 levers though.
There is on mine! I slackened it off and pistons popped straight back, job done.
M775 levers have bite point adjustment, but M765s only have reach adjustment.
Is the main lever body silver or black?