Road allair this morning

antgold

antgold

Member
and in the middle of the ride felt I'm loosing the breaking power .(Shimano XT )
I had this last year last year also and nothing helped -poring alcohol on the rotors , burning the pads -nothing helped :cry: finally I replaced the pads and used them the whole summer .
now it happened again ...:cry:the whole evening I'm trying to clean the rotors and pads and figure out what happened - now after some Web searching I got it:

"Calipers leak oil onto pads in cold weather!!! This happened last winter (2007) and just happened this year. Total BS! The pads get ruined and I have to replace them, but have to wait until it's warm so it doesn't happen again. This also happened to my Saint calipers. "


" They leak in freezing cold weather and self-ruin the pads!!"

no ride tomorrow ...I will borrow my wife's breaks (Avid ) and switch back after winter ...
 
Bring them in to your local Bike Shop.

Shimano should stand behind them. Are they really old??
 
break types : Shimano BR/BL -M765 (2007 )
the problem is that i brought the bike from Israel ...
anyhow - I have new set of Avid juicy 5 borrowed from my wife's bike she's pregnant so no biking this winter )

missed snow riding in allair ....🙁 ...tomorrow take 2
 
jShort said:
Somebody......please......
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THATmanMANNY said:
what? that hydraulic brakes are a gimmick and that mechanical disc brakes were always better? 😉
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I'm guessing he's referring to a similar situation that we saw with Bearman and Six Miles.

The letter E is the most abundant letter in the English language. And while we're here it's espresso, not expresso.
 
i recently read in bike that certain hydro fluid doesnt work well in the cold. shimanos fluid has a frezzin point around 30 degrees. and that avid uses dot3 (or somthin) and that is good up to -30 (or some negative amount)

now i have not looked at the article before replying but i am sure that shimano was supposed to not perform well at frezin temps but avid was.

so i will go search my issues for the article

any truth to this???
 
starflyr said:
i recently read in bike that certain hydro fluid doesnt work well in the cold. shimanos fluid has a frezzin point around 30 degrees. and that avid uses dot3 (or somthin) and that is good up to -30 (or some negative amount)

now i have not looked at the article before replying but i am sure that shimano was supposed to not perform well at frezin temps but avid was.

so i will go search my issues for the article

any truth to this???
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There is no way that shimano or any other brake mfg would use a fluid that would freeze during normal use.
 
read the article "going to extremes"

it states the frezzing temps of the various hydro brake fluids. from mountain bike magazine!!

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jdog said:
There is no way that shimano or any other brake mfg would use a fluid that would freeze during normal use.
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I know DOT 3, 4 and 5.1 fluids will work in temperatures that'll kill any human... but what's the freezing temp of mineral oil?:hmmm:

Found this statement with a google search, I do not know how valid it is though, since i'm not sure what the "usefull" minimum viscosity is for bike brake systems:
-30C(-22F) is listed as the freezing point for mineral oil. Due to viscosity (how thick the fluid is, basically), however, it's lowest useful temperature is considered to be 10C (50F).
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sk1er18 said:
I know DOT 3, 4 and 5.1 fluids will work in temperatures that'll kill any human... but what's the freezing temp of mineral oil?:hmmm:

Found this statement with a google search, I do not know how valid it is though, since i'm not sure what the "usefull" minimum viscosity is for bike brake systems:
Click to expand...


I tried to add oil and notice it was more like a galley (in the garage it was around 33 F ) ...anyhow I believe the leak comes from the seal and related to the compound of the seal rather the oil type .
change in viscosity should have an affect on the break modulation .

After I switched to Avid - no issue with the breaks (just came from 3 hours riding @22 F)
 
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