check this out
post 13 goes in to some detail another post (12)mentions using 2.5 wt fork oil
http://forums.mtbr.com/showthread.php?t=469027
the posts here also says fork oil is fine and recommend Finish line for what ever reason
substitute for mineral oil?
Saturday, January 2 2010 at 5:21pm
#2
Saturday, January 2 2010 at 6:11pm
#3
Thanks! Sounds like 2.5w fork oil might be great for the winter.
Saturday, January 2 2010 at 6:17pm
#4
Would DOT brake fluid (ala Hayes) work at all or would that eat the seals. I know that you can't sub mineral oil in Hayes...but maybe you can sub DOT in non-Hayes??
Saturday, January 2 2010 at 6:58pm
#5
Nah, DOT fluid will kill/eat the seals in Shim brakes.
Saturday, January 2 2010 at 9:11pm
#6
Happens on XT brakes as well. It happend to me twice on two separate bikes, and on several customers bikes. Shimano Canada initially told me that they have never heard of that problem before lol.
Saturday, January 2 2010 at 9:19pm
#7
It's a shame really. I know my allot of people who would ride Shimano's if it was not for the cold weather issues.
Sunday, January 3 2010 at 8:22am
#8
I dunno, I've been running deore discs for a couple winters now with no problems. Maybe you got some water/moisture in the line?
Sunday, January 3 2010 at 10:36am
#9
^^^^ Same here. Must be moisture unless it is because of the smaller reservior volume of the XTR brakes. Try a fresh bleed?
Anyone know of a substitute for mineral oil that could be used with Shimano brakes? I have XTRs and am less than impressed with the mineral oil freezing/expanding to the point of bursting the caliper seals and making the brakes festively loud and ineffective. This seems to be a (commonly observed) problem isolated to the XTR brakes, as the reservoir volume must be just too low, likely in the interest of weight savings.