Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-10-04, 11:58 AM   #1
joshj
Newbie
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hydraulic Brakes

Can anyone tell me how to fit a new lever to my bike which has hydraulic brakes. If I disconnect the old one, will I loose all the fluid, will I have to bleed the brakes afterwards and if so how do I do it?

I am from the UK and I have an Onza T Bird trials bike
joshj is offline   Reply With Quote
Old 11-10-04, 03:57 PM   #2
dave_h
Junior Member
 
Join Date: Sep 2004
Bikes:
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hi, if it was me, I'd drain all the fluid and just put new stuff in - its always better to work 'cleanly'. It's just a case of disconnecting the hose and putting it in the new brake lever. Just go to the manufacturer of your brakes website and try and download a set of instructions, that way you'll be working through a set of specific steps. They should also have little tricks to help you.
dave_h is offline   Reply With Quote
Old 11-10-04, 05:01 PM   #3
Simon_Clark
Member
 
Join Date: Nov 2004
Bikes:
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is it possible to have pneumatic brakes?

I want air brakes so they make cool 'PFFFFFFIIIISSSTTT' sounds when you release the pressure., Like a bus!

Simon
Simon_Clark is offline   Reply With Quote
Old 11-10-04, 05:05 PM   #4
Phiber
Cyclocrosser.
 
Join Date: Jul 2004
Location: Unit Zero
Bikes: '04 Marin Nail Trail, '04 Haro V-3, '05 Soul Monk
Posts: 351
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Simon_Clark
Is it possible to have pneumatic brakes?

I want air brakes so they make cool 'PFFFFFFIIIISSSTTT' sounds when you release the pressure., Like a bus!

Simon
o_o You do realise that those busses use a compressor to form air pressure?

And in theory it could be done. The pneumatic thing, that is. In fact, it would make more practical sense than hydraulic. just carry a 'brake pump' around. The only thing is that gasses compress.
Phiber is offline   Reply With Quote
Old 11-10-04, 05:06 PM   #5
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity
Posts: 15,061
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Simon_Clark
Is it possible to have pneumatic brakes?

I want air brakes so they make cool 'PFFFFFFIIIISSSTTT' sounds when you release the pressure., Like a bus!

Simon
No.
__________________
Raiyn is offline   Reply With Quote
Old 11-10-04, 05:24 PM   #6
matheprat
Senior Member
 
matheprat's Avatar
 
Join Date: Oct 2004
Bikes:
Posts: 221
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Are you talking about HS-33s? Or rim brakes at least?
You should be able to change the lever without rebleeding, but you will have to top up the fluid. Just unscrew the hose fitting into the lever with an 8mm spanner, then screw it into the new lever. Try and keep the hose upwards so as little fluid as possible leaks out. Then once it is screwed into the new lever, unscrew the bleed valve (the little screw going into the lever just above the hose coming out, and top it up with some Magura royal blood, or water with a bit of antifreeze in. Never Dot4 brake fluid.
You should be able to get it pretty good this way, maybe not perfect without a full bleed, but pretty good at least.
Cheers
matheprat is offline   Reply With Quote
Old 11-10-04, 05:39 PM   #7
Simon_Clark
Member
 
Join Date: Nov 2004
Bikes:
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Phiber
o_o You do realise that those busses use a compressor to form air pressure?

And in theory it could be done. The pneumatic thing, that is. In fact, it would make more practical sense than hydraulic. just carry a 'brake pump' around. The only thing is that gasses compress.
Yeah but I thought of that too lol

There will be a counter weight on the back wheel which will push a push with each revolution and store compressed air in a canister below the rider (Where you usually put those crappy water bottles).
Then the brakes have lots of supply! But if you are free-wheeling down a hill and come to a road your screwed lol I'll work on that part

Simon
Simon_Clark is offline   Reply With Quote
Old 11-10-04, 08:09 PM   #8
Rev.Chuck
The Red Lantern
 
Rev.Chuck's Avatar
 
Join Date: Apr 2003
Location: Raleigh NC
Bikes:
Posts: 5,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you want an air brake on a bike use a air piston that has a release valve that opens and immediatly closes at tdc and bdc. As it strokes up the valve is closed and compression builds slowing the wheel. At tdc the valve opens releasing the compressed air and then closes allowing the cylinder to draw compression to bdc where the valve will open and let atmosphere back into the cylinder to be compressed on the next cycle. When just riding along the valve will be held open to eliminate the braking effect. This way you do not have the extra weight of a storage cylinder or the system drag while you build up pressure.
__________________
Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
Help out the forums, abide by our community guidelines.

I am in the woods and I have gone crazy.
Rev.Chuck is offline   Reply With Quote
Old 11-10-04, 08:44 PM   #9
Becca
Get outdoors! :)
 
Becca's Avatar
 
Join Date: Oct 2004
Location: Charlotte, NC
Bikes: Schwinn Sierra 700 Limited Edition
Posts: 456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Raiyn
No.
Why not? With some thought and cleverness, it could be done without adding a whole lot of weight to things. Just because something hasn't been done (side to everyone else: it hasn't, had it?) doesn't mean it shouldn't be at least tried. How else do we make advances?
Becca is offline   Reply With Quote
Old 11-10-04, 11:01 PM   #10
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity
Posts: 15,061
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Becca
Why not? With some thought and cleverness, it could be done without adding a whole lot of weight to things. Just because something hasn't been done (side to everyone else: it hasn't, had it?) doesn't mean it shouldn't be at least tried. How else do we make advances?
Then I suggest you start cracking. Build an air brake system that could compete with a set of hydraulic discs. The system can NOT use gas cylinders (like the Shimano Air Lines shifter system) as we're talking about brakes here. You need them more than you would shifting so the "always availiable" aspect needs to be respected. The system must match Hydraulics in terms of power and yet be as light as an average set of hydraulic disc brakes. The system must also be simple enough so that any average bicycle mechanic can service it. Rev's idea has merit but it's still more complicated than a hydraulic system.

If air brakes were practical they'd already be making them.
__________________
Raiyn is offline   Reply With Quote
Old 11-10-04, 11:20 PM   #11
Becca
Get outdoors! :)
 
Becca's Avatar
 
Join Date: Oct 2004
Location: Charlotte, NC
Bikes: Schwinn Sierra 700 Limited Edition
Posts: 456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I didn't say it was practical; I asked why not? Heck, think about it - if someone figured it out and had it on their bike, it'd be a one-off and *totally* unique! Just for that it would be the envy of geeks everywhere!
Becca is offline   Reply With Quote
Old 11-11-04, 12:54 AM   #12
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Bikes:
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hydrolics would be cool! Maybe not for marketing but a personal project
blue_neon is offline   Reply With Quote
Old 11-11-04, 12:59 AM   #13
Dannihilator
User Title
 
Dannihilator's Avatar
 
Join Date: Oct 2002
Location: Annandale, New Jersey
Bikes: 2014 Surly Steamroller, 1989 Nishiki Altron
Posts: 19,422
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Where would the pressurized air source lay, and how won't it effect the frame's strength and how will you get new air in since air brakes can't run on used air?

You're sooner to develop steam brakes before air brakes for a bike. Shimano tried Air powered shifting, didn't go over too well. Alot of punctures in the air hoses.
__________________
Signature.
Dannihilator is offline   Reply With Quote
Old 11-11-04, 01:51 AM   #14
joshj
Newbie
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My brakes are HS11's and please could you advice me on how to bleed them.
joshj is offline   Reply With Quote
Old 11-11-04, 12:34 PM   #15
matheprat
Senior Member
 
matheprat's Avatar
 
Join Date: Oct 2004
Bikes:
Posts: 221
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The HS-11 brake levers do tend to break easilly. At least more easilly than HS-33s. Look on the Magura website (www.magura.com), click on bike components, and then brakes, and they have a full manual on how to bleed them. I think it is also in the manual given with new breaks. I'm not sure whether or not you actually read my last post, but if you're careful, you shouldn't need a full bleed.
Cheers
matheprat is offline   Reply With Quote
Old 11-11-04, 03:07 PM   #16
joshj
Newbie
Thread Starter
 
Join Date: Nov 2004
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the info will give it a try
joshj is offline   Reply With Quote
Old 11-13-04, 03:34 AM   #17
da_empire04
MudLover
 
Join Date: Nov 2004
Location: Melbourne, Australia
Bikes: Giant AC 2005, Custom BMX(no 2 parts from same brand) and no-name (but reliable) duallie
Posts: 56
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by blue_neon
Hydrolics would be cool! Maybe not for marketing but a personal project

I think that you mean pneumatic, not "Hyrdrolics". pneumatics is to do with air, hydraulics is to do with liquids.

NOTE: not trying to be an a**hole, just felt like correcting
da_empire04 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 01:29 AM.