Unicyclist Community

Go Back   Unicyclist Community > Unicycling Discussion > General Unicycling Discussions

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 2019-07-10, 06:40 AM   #1
Setonix
Unicyclist
 
Join Date: Jul 2015
Location: Duiven, The Netherlands
Age: 43
Posts: 883
Hydraulic brake with air in it

Last week I switched around some seats on two unis and some days later I noticed there was no pressure on the brake cable anymore. First I thought it would be easy to fix by pulling the metal wire in it as I do on the brakes of my normal bike, but then I noticed it was a hydraulic brake, which doesn't have a wire inside.
I took it to the bike store and they asked if I had seen it leak. I hadn't so they made the conclusion that somehow air had come in and has to be let out. I asked them if I could do this myself, but they claimed I needed special tools and only they could do it. Also they said it would take them 30-45 minutes to fix.
Is it really so complicated to let the air out or are they just saying it to earn something on me? They say I'd pay the hourly wage, so 27 eur if it takes 30 mins. If it happens again, I'd rather be able to fix it myself.
Setonix is offline   Reply With Quote
Old 2019-07-10, 07:03 AM   #2
UniMyra
I don't like unicycling, I love it.
 
UniMyra's Avatar
 
Join Date: Aug 2011
Location: Oslo (Kolbotn), Norway
Age: 54
Posts: 652
You need to buy a bleed kit for your brake. Search for "bleed shimano brakes" (or whatever brand). You can do it yourself, but in my experience it helps to be 2 people to do the job.
__________________
UniMyra's YouTube channel
UniMyra is offline   Reply With Quote
Old 2019-07-10, 07:41 AM   #3
pierrox
Unicyclist
 
pierrox's Avatar
 
Join Date: Jul 2012
Location: Between Paris, Grenoble, NY and NC
Age: 48
Posts: 1,286
Agreed. It's not that complex, but it can get messy quickly! Add a big syringe (no needle required) to the bleeding kit you buy - a few cents at any pharmacy.
pierrox is offline   Reply With Quote
Old 2019-07-10, 07:51 AM   #4
kunstrasen
Unicyclist
 
Join Date: Feb 2015
Location: Jüchen, Germany
Age: 50
Posts: 255
Actualy bleeding of Shimano brakes is pretty easy. You need the Shimano bleeding kit and the Shimano oil for brakes. As Shimano is using oil and not DOT4/5 all parts can be cleaned easily if you drop some oil. Make sure to remove pads before bleeding.
kunstrasen is offline   Reply With Quote
Old 2019-07-10, 09:24 AM   #5
finnspin
one wheeled cycling
 
finnspin's Avatar
 
Join Date: Nov 2008
Location: Lüneburg,Germany
Posts: 774
Some brakes really don't like being upside down, if I remember correctly Shimano is one of them. Just putting the unicycle back the correct way around, and pulling the lever a lot can sometimes help. If the lever stays soft, definetely bleed the brake.

I recommend not buying the cheapest bleed kit you can find. You don't need shop grade equipment either, but the super cheap stuff tends to suck. Put some cardboard anwhere the fluid could drip, and as others said, remove the brake pads. Use brake clean to get rid of any residue from spilled fluid.
__________________
In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move. -Douglas Adams.
finnspin is offline   Reply With Quote
Old 2019-07-11, 12:09 PM   #6
kunstrasen
Unicyclist
 
Join Date: Feb 2015
Location: Jüchen, Germany
Age: 50
Posts: 255
Shimano is fine with beeing upside down. Old Magura disks definatly had this issue. No idea about new ones. I also had older Hopes which were sensitive on position. For the kit I agree to Finnspin, get an original (for the maker you have) bleeding kit. They are not expensive and fit well. Especially on the brake lever every maker uses different screws.
kunstrasen is offline   Reply With Quote
Old 2019-07-11, 12:39 PM   #7
Setonix
Unicyclist
 
Join Date: Jul 2015
Location: Duiven, The Netherlands
Age: 43
Posts: 883
It is not a Shimano on my Nimbus 29" from 2015. Don't remember what brand brake it is. It is at the LBS now and hopefully will soon be fixed. And yes I had the uni upside down when screwing the seat back on (basically screwed the uni onto the seat). Next time I will take the seat out of the frame first, but I was lazy.
Setonix is offline   Reply With Quote
Old 2019-07-12, 12:42 AM   #8
anton005
Unicyclist
 
Join Date: May 2007
Location: Bellevue, WA
Age: 49
Posts: 1,312
Having your uni upside down for a few minutes shouldn't cause any problems regardless of brand (it's extended periods of storage that some don't like). But if there was air trapped somewhere in the lines/pistons it could have been dislodged by having it upside down shortly. I've had plenty of trouble with brake sets that were supposedly pre-bled and ready to go.

It's fairly easy to do, but like they said you need the tools. The first time it's a hassle, but once you figure out what you are doing it's a piece of cake. Youtube will be your friend
anton005 is offline   Reply With Quote
Old 2019-07-12, 06:11 AM   #9
Setonix
Unicyclist
 
Join Date: Jul 2015
Location: Duiven, The Netherlands
Age: 43
Posts: 883
Quote:
Originally Posted by anton005 View Post
Having your uni upside down for a few minutes shouldn't cause any problems regardless of brand (it's extended periods of storage that some don't like). But if there was air trapped somewhere in the lines/pistons it could have been dislodged by having it upside down shortly. I've had plenty of trouble with brake sets that were supposedly pre-bled and ready to go.

It's fairly easy to do, but like they said you need the tools. The first time it's a hassle, but once you figure out what you are doing it's a piece of cake. Youtube will be your friend
You're probably right. As this is just the first time in the 4 years I've been riding it happened, I won't spend money on the tools, but if it will happen more often I will and I saw on youtube there are quite some vidz about it.
Setonix is offline   Reply With Quote
Reply

Tags
air, brake, hydraulic


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Echo Hydraulic rim brake mscalisi General Unicycling Discussions 12 2007-04-03 11:20 PM
Hydraulic Drag Brake gbarnes General Unicycling Discussions 6 2004-08-06 01:54 PM


All times are GMT. The time now is 09:49 PM.


Powered by vBulletin®
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright © 2001-2016 Gilby
Page generated in 0.06173 seconds with 11 queries