Retrobike Forum Index

Retrobike Forum Index » Bike Chat 1998 --> » Bike Chat 1998 -->

It is currently Sun Sep 24, 2017 6:18 am
* Login   * Register * Search  * FAQ



Post new topic Reply to topic  Page 1 of 2
  [ 11 posts ]  Go to page 1, 2  Next
  Print | All Previous topic | Next topic 
Author Message
twain
 Post subject: mixing brake fluid
PostPosted: Sat Dec 15, 2012 10:10 pm 
retrobike rider
retrobike rider
User avatar

Joined: Thu Oct 14, 2010 1:33 pm
Posts: 4100
Location: Brighton
have a shimano brake M755 - it looks to have non shimano fluid in it, but i need to top it up. can i put shimano fluid in (essentially mixing it)...???

bought the brake second had so dont know what fluid is already in it..
Top
 Profile  
 
xerxes
 Post subject:
PostPosted: Sat Dec 15, 2012 10:20 pm 
Old School Grand Master
User avatar

Joined: Sun Mar 14, 2010 2:33 am
Posts: 3277
Location: daaan saaaf
I would completely drain it and replace it with the correct fluid and shouldn't Shimano brakes use mineral oil?

Might be useful: http://www.epicbleedsolutions.com/
Top
 Profile  
 
twain
 Post subject:
PostPosted: Sat Dec 15, 2012 11:14 pm 
retrobike rider
retrobike rider
User avatar

Joined: Thu Oct 14, 2010 1:33 pm
Posts: 4100
Location: Brighton
well i think i drained it....wasn't sure how to do that properly, so i just pushed through shimano fluid until it was all nice and pink in the reservoir and just worked out all the bubbles.....
the previous fluid was yellowish....
Top
 Profile  
 
cyfa2809
 Post subject:
PostPosted: Sat Dec 15, 2012 11:33 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
User avatar

Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
Yellowish sounds like dot fluid. Dont run them too hard for a little while and see if any leaks develop or if the pistons seize up.
Top
 Profile  
 
twain
 Post subject:
PostPosted: Sat Dec 15, 2012 11:56 pm 
retrobike rider
retrobike rider
User avatar

Joined: Thu Oct 14, 2010 1:33 pm
Posts: 4100
Location: Brighton
i'm going out for a retrobike ride tomorrow hopefully, so we'll see how it all holds up!
Top
 Profile  
 
bigmick
 Post subject:
PostPosted: Sun Dec 16, 2012 1:16 am 
Retro Guru

Joined: Tue May 06, 2008 4:24 am
Posts: 713
Location: Edinburgh
shimano mineral oil is pink/red because of the dye the put in it

dot brake fluid will f**k the seals

the colour doesn't really tell you much about what type of fluid is in the system
Top
 Profile  
 
twain
 Post subject:
PostPosted: Sun Dec 16, 2012 9:12 am 
retrobike rider
retrobike rider
User avatar

Joined: Thu Oct 14, 2010 1:33 pm
Posts: 4100
Location: Brighton
well the brake was working ok before i bled it (i.e. it wasn't awful, just a little too much movement on the lever before it bit) and the reservoir was about half - 2/3rds full when i opened it up, so hopefully that was the reason.

i aint fettling with it anymore as i'm due out in about an hour and a bit :? but a quick test with the pads and brake insert in tells me its been bled ok for now.....
Top
 Profile  
 
02gf74
 Post subject:
PostPosted: Sun Dec 16, 2012 10:15 am 
Old School Grand Master
User avatar

Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4861
Location: Herts UK
magura and shimano * use mineral oil, dyed blue and pink respsectively, all other makes use DOT i.e. car brake fluid.

it is commonly stated that using the incorrect fluid will damage the seals but i have yet to hear of anyone doing, either it does not or nobody has tried it, or they have and did not post about the result.

I am only aware of those 2 makes, but feel free to add to the list.
Top
 Profile  
 
Whatleymeister
 Post subject:
PostPosted: Sun Dec 16, 2012 11:39 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Thu Feb 24, 2011 1:15 am
Posts: 1887
Location: Getting fitter, I will beat the Surrey Hills....
I asked about this a little while back. You can use magura mineral oil in a shimano system, but apparently you cant mix them as the fluids are a slighly different weight and can separate. Just dont use dot fluid in a mineral system or vice versa and you should be sound.
Top
 Profile  
 
dbmtb
 Post subject:
PostPosted: Thu Dec 20, 2012 9:39 am 
Gold Trader
Gold Trader
User avatar

Joined: Wed Jun 20, 2007 11:19 pm
Posts: 7006
Location: Odense, Denmark
Ive seen plenty of ruined shimano brakes where dot was used instead of mineral oil. shima oil fades to a colour resembling dot oil over time. If its had dot in it will flood out of the pistons. Tektro oil is fine too.
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 2
  [ 11 posts ]  Go to page 1, 2  Next

Retrobike Forum Index » Bike Chat 1998 --> » Bike Chat 1998 -->

All times are UTC [ DST ]

Who is online

Users browsing this forum: No registered users and 17 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
New Forum Posts
Patina or Refinished
 Poster: Doogsevo1
 Date: Sun Sep 24, 2017 5:03 am

Cook brothers RSR LH crank & spider
 Poster: BAScorsa1988
 Date: Sun Sep 24, 2017 3:37 am

Cook Brothers seat clamp
 Poster: BAScorsa1988
 Date: Sun Sep 24, 2017 3:26 am

1997?? Chuck CR-HT (FRAME ONLY)
 Poster: BAScorsa1988
 Date: Sun Sep 24, 2017 3:16 am

2000 Rocky Mountain Reaper frame - Large
 Poster: BAScorsa1988
 Date: Sun Sep 24, 2017 3:03 am
Right now on ebay
Raleigh - I'm in love but she said no.
 Poster: The History Man
 Date: Sat Sep 23, 2017 10:36 pm

Whole lot of Vintage Road components and more on my Ebay
 Poster: pirallina
 Date: Sat Sep 23, 2017 3:43 pm

hope ti hub hiding in a bundle
 Poster: mynchiboy
 Date: Sat Sep 23, 2017 1:28 pm

1997 Kona Koa Racelite £300 starting bid
 Poster: petehaddock
 Date: Sat Sep 23, 2017 1:13 pm

Breezer £25
 Poster: integerspin
 Date: Sat Sep 23, 2017 3:29 am

About Us

Follow Retrobike

Other cool stuff
All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group