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Hurriedly stuck new pads in my (old version) deore front brake last night.
With the pistons pushed out to their most recessed position, the wheel spins freely with a decent gap between pad and disc, when i push down the brake lever the pistons move the pads to grip the disc and will stop the wheel
BUT from that point, the pads still stay tight enough to the disc to stop the wheel spinning freely - the pads dont open back up enough to allow it.
It was fine with the old pads and i bled them pretty recently. Is it the little spring between the pads not being "active" enough or is some dirt impeding the movement of the pistons?
Sure im just being thick and its less embarassing to ask on here than face to fae in my LBS later today!
Did you bleed the brakes with old, worn pads in? If so you might have to let some fluid out.
yeah they would have been fairly worn i guess. why would that make a difference?
Makes a difference as you've changed the default setup of the brake to use a narrower set of pads, so the pistons sit further out. Often just letting some oil out at the caliper and resetting everything again can sort it. Failing that, enjoy some resistance training!
Yes, you'd be allowing more fluid into the caliper than the normal. It's best to take the pads out and use the yellow bleed blocks instead. Then you get the right amount.
ok so pads out, yellow blocks in and bleed again?
Thats my evening entertainment sorted! 🙂
You bleed your brakes when you change the pads? Unless you have spongey or a lack of power there is no need to bleed them.
Sounds more like the pistons need a clean and are a little sticky.
ok so pads out, yellow blocks in and bleed again?
Yes, that's what I would do. Then it's right for all wear levels of pad.
Thanks! Mid wear bleed was necessary after the brakes went sponges after a particularly exciting "off" where the bike cut its own trail down the hill with scant regard for the main line! 🙂
I'll bleed and clean them and see what happens!
Sorted by draining a little fluid from the csliper.
Thats another new bit of bike maintenance knowledge for me today.
Thank you everyone!