it was -6 here last night (at the warmest part of the ride - under the trees).
my SLX brakes were/are fine.
my hone brakes were used on a friends bike - they seem fine.
my deore brakes are also unaffected.
so far, it's only my lx brakes* that have gone a bit 'funny' and then leaked oil over the pads/disc.
(*circa 2007 as a guess).
i would hazard another guess that if your brakes are from 2009/2010, or deore, then you don't need to worry...
ahwiles - my older XT's did it, they were 07, lever went hard, virtually no travel, minimal power, but never got to the leaking piston stage. My 10 XT's are exactly the same, although again not had the leaking fluid, just weird lever feeling
hmm...
(scratches beard)
I had some 2005 deores on my bike till summer. They survived plenty of winters. They felt wooden in the cold but still worked. They went back to normal when they warmed up. Current SLX do it now.
Sounds like you've been unlucky or have another problem where the stress of the cold has caused failure.
Original Saints (I think) basically the same as the XT's of that era. 1 piece 2 piston caliper.
Fine last night at around -5. Probably a bit less lever travel.
Stored in a garage which isn't freezing but not warm either.
shimano has a known problem with their seals leaking in cold weather, for me it seems to happen in very cold weather 10-15 degrees.
Shimano has replaced 3 xtr calipers for me so far. the warranty for xtr is 3 years, 2 for xt, theyve allways included new pads as well since the old ones are oily, make sure you sand and clean the rotor
supposedly they have fixed the problem but I havent had mine that cold yet. should know this season. my older xt (05?) also have started leaking. so since theyre on a pugsley Im replacing them with BB7s
That makes sense. I thought something had gone wrong with my front brake (pre 06 deore) when it pissed oil all over the floor through the piston. Hasn't affected the rear brake of the same vintage though. Will a rebleed fix the issue, or do I need to think about looking at a new front brake....?
I posted about this a while back as my LX M585 were playing up horribly and did the same last winter (although they survived and worked well for the rest of the year). I'm not sure about the oil thickening, the general concensus seemed to be that the rubber in the seals hardedens up. With each succesive pull on the levers the travel reduced until there was virtually none and the pad were in contact with the rotors (not enough to lock the brake but more than enough to be really annoying). When my brakes need replacing I'd be interested to know if there are any Shimano models that don't suffer this.
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