http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Shimano BR-M445 hydraulic brakes applying themselves en Wed, 13 May 2026 04:24:00 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=9330#post-97770 Wed, 23 Jan 2013 12:18:04 +0000 DaveC 97770@http://citycyclingedinburgh.info/bbpress/ <p>I had this in my car a few years ago. Water got into the system and when it was very cold they were binding and getting very hot. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=9330#post-97766 Wed, 23 Jan 2013 11:51:55 +0000 paul.mag 97766@http://citycyclingedinburgh.info/bbpress/ <p>Darkerside, am reluctant to rule anything out but am 99% certain that the wheel isn't slipping the quick release this morning was very tight<br /> DaveC, I wondered if the recent cold weather could have caused the oil in the hydraulics to be affected in some way or if the constant crap from the roads could have contaminated the pistons/calipers.<br /> I guess i'll just battle home tonight and then over the weekend strip it all apart and see what I find </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=9330#post-97754 Wed, 23 Jan 2013 10:20:01 +0000 DaveC 97754@http://citycyclingedinburgh.info/bbpress/ <p>Could be water ingress into the system. If this freezes the ice expands causing the brakes to bite. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=9330#post-97752 Wed, 23 Jan 2013 10:11:07 +0000 Darkerside 97752@http://citycyclingedinburgh.info/bbpress/ <p>Wheel slipping in the frame, perhaps? If the rotor is gradually sneaking out of alignment with the calipers, then that might cause the effect. And it would also be reset when you wiggled the wheel.</p> <p>As a starter for ten then - check quick release is done up tight! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=9330#post-97751 Wed, 23 Jan 2013 10:01:23 +0000 paul.mag 97751@http://citycyclingedinburgh.info/bbpress/ <p>Ok I know it sounds a bit odd but my rear brake not only appears to refuse to let go of the disc but also seems to be engaging even if I haven't pulled the lever. This morning I had to stop a couple of times to loosen the rear wheel and give it a wiggle to try and loosen the brakes off. I tightened it back up again and checked it still spun freely then cycled a bit further maybe 1-2 miles and then had to stop again and repeat the procedure. Anyone experienced this before or able to give me some repair tips, I have my lunch time to effect the fix. </p>