Old 10-07-13, 10:37 AM
  #5  
bobotech
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Join Date: Jan 2012
Location: Spokane, WA
Posts: 2,255

Bikes: Specialized Sequoia Elite/Motobecane Fantom Cross Team Ti/'85 Trek 520

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Originally Posted by Greenfieldja View Post
It is probably possible to do it without a kit but it may be messy and results may vary. I understand your point as $60 seems a bit excessive. If you are going to have your bike for a while I recommend investing the $19 for a bleed kit so you have the tools to do the job conveniently whenever you need to.

http://www.amazon.com/Avid-Brake-Ble...cy+7+bleed+kit

Here are some links to guid you through the procedure:
https://www.youtube.com/watch?v=6mg6NbIjmOM

http://www.parktool.com/blog/repair-...-bleed-service

-j
Awesome, much cheaper than buying the 60 dollar kit at the bike shop.

Originally Posted by dabac View Post
The key difference between bike hydraulics and car hydraulics is "open" vs "closed" system. A car system is open, meaning the reservoir isn't under pressure and that the main cylinder will be refilled from the reservoir when the lever is released.
A bike system is closed, meaning there really isn't a reservoir to draw from. The system is blocked off at both ends, all the time.
If you think of bleeding a bike brake as first adding a reservoir, then the rest is pretty much like bleeding a car brake.
Some recommend that you should create some suction as well, to make it easier for any air bubbles to escape. The argument being that with the small volumes used in a bike, flow enough won't get rid of the bubbles as it does in a car.
Bleed kits do make the job easier and less messy, but if you look at the instructions you'll soon notice that the main part of the bleed kits are the syringes. And syringes you can get elsewhere, for less money. I've gotten mine from pharmacies and lab equipment suppliers.
With a bit of luck, you can jam them into the bleed ports well enough to get the job done w/o any further equipment.
Yeah, the more I look at the kit, I already have everything except for the actual fittings that screw into the ports. Its a shame you can't get just the brass fittings. I have the syringes, the tubes, and even a pile of those plastic click hose clamps. Hmmm. I wonder if I can get a small car bleeder screw to fit into the bleed port of the caliper? In that case, I already have all the parts necessary.

I have the syringes since I used them to bleed oil injection pumps on 2 cycle engines.

But then again, 19 dollars isn't bad for the whole kit.
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