Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Part of the furniture math2p14's Avatar
    Join Date
    Sep 2002
    Location
    Exeter UK, Athens Greece.
    My Bikes
    Specialized RH, Scott Unitrack
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Mineral OIL -DOT fluid question

    Hi guys

    I need some help here. I am sorry that i have troubled you all with my disc brake questions so far. I had my brakes bled 2 weeks ago by my LBS , Team-Skene at Cardiff,UK. The brakes work however they dont have full power....the front cant lock yet...wereas the rear can lock if dirty and not cold. Anyway.
    Yesterday i opened the reservoir cap to add some oil and i noticed that the color of the oil inside the reservoir is different than the shimano oil that i have in bottle. Shimano OIL is kind of red color while the oil inside my brakes is like a natural oil-color. I have noticed that at the LBS as well when they bled them. I am mostly concerned with the possibility that the bike shop bled my brakes with DOT rather than mineral oil... they said they used the shimano bleeding kit however...Anyway i added some red oil in the reservoir and it mixed with the existing oil...Can i tell if i have DOT or mineral on my system? Its Deore XT so its supposed to have only mineral in it. The oil smells a bit like baby oil...and i need some help here ...thanks guys ....i ll appreciate quick responces because they got me very nervous and its sunday and everything is closed here.
    Where the skid marks stop...the tree begins....:D:D:D:D:D

  2. #2
    Ich bin ein Lowlander! toolfreak's Avatar
    Join Date
    Mar 2001
    Location
    Atlantic Ocean, France
    Posts
    583
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    First of all; never mix any brake fluids until the manual or brake fluid code tells you so!!!

    From the shimano website; "The use on systems with DOT fluid may damage the rubber plate.

    Note: Never mix different brake fluids. Use only genuine Shimano mineral oil. If other types of oil are used, it may cause problems with brake operation and cause the system to be unusable"


    DOT based oils are mixable IF they are FULL synthetic, with modern oils you can mix DOT 4 with Dot 5.1

    You can recognize DOT fluid because its aggressive to paint and it bites on your skin.

    Most mineral oils are not mixable; since you mixed two kinds, you probably need to bleed again.
    Contact your LBS and explain the situation
    Mark







    Dancevalley 2th of august 2003 -> JXL, Laidback luke, Sasha, John Digweed, Monica Krusse.....and on!

  3. #3
    Senior Member
    Join Date
    Jul 2002
    Location
    MI
    Posts
    691
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Dude, about the braking power as we have told you before and will tell you again that is gonna come with some time. Disc breaks dont up and stop you on a dime, it usually takes a couple of rides to do, and XT's at the lever generally do feel squishier. My hopes feel more solid than my Bro, but the XT's have a little more power.

  4. #4
    Part of the furniture math2p14's Avatar
    Join Date
    Sep 2002
    Location
    Exeter UK, Athens Greece.
    My Bikes
    Specialized RH, Scott Unitrack
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ok i got some of this fluid on my second bike with a paintbrush and nothing happened!!!!! It didnt come off or anything...paint is ok. Also my fingers are ok no irritation or anytheir either so i guess its mineral right?
    Thank you all for the replies...i owe you.
    Where the skid marks stop...the tree begins....:D:D:D:D:D

  5. #5
    New to bikeforýms.net
    Join Date
    Jan 2001
    Posts
    2,202
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Originally posted by math2p14
    Ok i got some of this fluid on my second bike with a paintbrush and nothing happened!!!!! It didnt come off or anything...paint is ok. Also my fingers are ok no irritation or anytheir either so i guess its mineral right?
    Thank you all for the replies...i owe you.

    Um hi.....why in gods name did you post the same thing 2 times again? Dont you get it?

  6. #6
    Part of the furniture math2p14's Avatar
    Join Date
    Sep 2002
    Location
    Exeter UK, Athens Greece.
    My Bikes
    Specialized RH, Scott Unitrack
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I opened my internet explorer twice and i posted on both windows ....when you are a bit anxious you do make mistakes...

    dont be hard on me for an accidental posting
    Where the skid marks stop...the tree begins....:D:D:D:D:D

  7. #7
    Gravity Is Yer Friend dirtbikedude's Avatar
    Join Date
    May 2002
    Location
    "Over the Hill" and going down fast in the 805.
    My Bikes
    Scott Gambler, Scott Ransom, Kona Bear, Bianchi 928 Carbon/Chorus, C'Dale Rize4
    Posts
    2,961
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The Shimano systems are designed to be used with mineral oil. If you are questioning which one was put in you system and now you have mixed them i would suggest draining the system and putting the mineral oil in.

    "After you fix or replace the damaged line, you'll need to bleed your brakes, which brings up the subject of hydraulic fluid. In general, disc brakes use one of two varieties of hydraulic fluid: mineral oil or DOT fluid. Unfortunately, there are different concoctions of each, and you shouldn't mix the different kinds-ever. Don't mix Shimano's mineral oil and Magura's mineral oil. Even more disastrous is mixing or replacing DOT fluid with mineral oil, or vice versa. Doing so will probably eat all the rubber seals in your brakes and cause costly damage and a severe case of no brakes. The only quasi-exception is that you can replace one DOT variety with another-for instance, you might be able to replace DOT 4 with DOT 3 (the larger the number, the higher the boiling point of the fluid). However, you must flush out all the fluid you're replacing, which is time-consuming. In the end, you're simply better off just sticking with the fluid that comes with your brakes. "

  8. #8
    Gravity Is Yer Friend dirtbikedude's Avatar
    Join Date
    May 2002
    Location
    "Over the Hill" and going down fast in the 805.
    My Bikes
    Scott Gambler, Scott Ransom, Kona Bear, Bianchi 928 Carbon/Chorus, C'Dale Rize4
    Posts
    2,961
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Here is the link to the info I posted for you.

    Mixin' fluids

  9. #9
    Part of the furniture math2p14's Avatar
    Join Date
    Sep 2002
    Location
    Exeter UK, Athens Greece.
    My Bikes
    Specialized RH, Scott Unitrack
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well i didnt mix them exactly...they seem to be both minerals since they dont affect paint or skin. I just added a tiny drop in the reservoir in order to close the cap again. Do i need to rebleed just for a drop?
    Where the skid marks stop...the tree begins....:D:D:D:D:D

  10. #10
    Gravity Is Yer Friend dirtbikedude's Avatar
    Join Date
    May 2002
    Location
    "Over the Hill" and going down fast in the 805.
    My Bikes
    Scott Gambler, Scott Ransom, Kona Bear, Bianchi 928 Carbon/Chorus, C'Dale Rize4
    Posts
    2,961
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have never mixed them but look at it like this, you are flying down a hill and low and behold, your seals give way and you can not stop. When it comes to such things as brakes I want to be compleatly sure they will not fail when I need them most.
    Personaly I would drain the system and refill it. Aslo, if it does destry your seals you will not only have to replace the fluid but also the seals. Not worth the expense in my opinion.

  11. #11
    Senior Member slcpunk21's Avatar
    Join Date
    Sep 2002
    Location
    finally transplanted!
    Posts
    454
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The bike shop used another mineral oil. If they had some older magura mineral oil sitting around it would wont be red...more green, or natural color! You said it smelled like baby oil...so it IS mineral oil! If you mixed them it's nota huge issue...the only difference would be in the weight....i.e. just like fork oil(which alot of it is also mineral oil).

    Here's an idea...since you have brought the thing to you LBS a ton of times..instead of bring it back again...try and bleed em yourself and see what happens, if you screw it up oh well you were gonna bring it back to them anyways!

    Don't worry about the oils...the stuff in there is mineral oil. If you smelled brake fluid it'd be pretty harsh..nothing even close to baby oil.
    if you aren't having fun, then you get rigid, stiff, crash, cry and then you make your new friend run away..... (there don't you feel less nervous now?)

    when it's snowin check this place out http://www.treelinemedia.ca/phpBB2/index.php

  12. #12
    Part of the furniture math2p14's Avatar
    Join Date
    Sep 2002
    Location
    Exeter UK, Athens Greece.
    My Bikes
    Specialized RH, Scott Unitrack
    Posts
    930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks guys. Just talked to them on the phone. They said its mineral 100% and they use it on all shimano brakes. They also said that its compatible with shimano oil for mixture as long as both are new. anyway they look like pro guys so i ll trust them for the time being. If they screw up they will probably have to buy me new brakes ....

    Yannis.
    Where the skid marks stop...the tree begins....:D:D:D:D:D

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •