| Brake
Line Bleeding Guide Excerpts from the
Garage message board:
Brian Wottowa -
1. Buy some high quality DOT 4 fluid and top off your reservoirs.
Top them off periodically during this procedure. Do not spill any fluid
on your bike cause it will eat your paint off. The front brake reservoir
tends to spit fluid out the top during this process so make sure you
place a bunch of rags around it to catch the fluid.
2. Put a short section of hose on the bleed valve on the brake caliper.
Put a jar or other suitable container on the other end to catch the
runoff. You'll need to move the hose and jar around to each caliper as
you work on them.
3. Use a 10 mm to open the bleed valve while simultaneously squeezing
the lever (or pedal). About 2/3 of a turn on the wrench will do it.
Fluid should run out of the hose at this time. When you squeeze to
within 3/4 of your full lever throw, use the wrench to close the valve.
It is important that you close the valve before hitting full travel on
the lever. Release the lever and repeat the process (squeeze lever, open
valve, close valve, release lever) until the fluid runs with no bubbles
and the lever is firm. You'll be amazed how firm you can get your
system. Don't forget to periodically top off you reservoirs. And do not
under any circumstances release the lever or pedal with a bleed valve
open. This will pull air back into your system.
This is the order I bled mine in:
1. front left
2. front right
3. front left again
4. front right again
5. back
Martin Gibson -
You can make a bleeder resevoir fairly easily by taking a glass jar
(preferably clear) with a lid (preferably threaded, screw on type). Put
a hole in the jar lid just large enough to get the hose through. Put a
small amount of brake fluid in the jar. Screw the lid on the jar and
push the hose end into the brake fluid at the bottom of the jar and put
the other end of the hose onto the bleed valve. By doing this you will
limit the chances of sucking air back into the brake lines. It's really
handy if you're doing the job alone. If you have another lid to fit the
jar, you can remove the lid with the hole in it and put the other one on
to preserve the fluid for future use (as long as it's clean) or to reuse
just for bleeding brakes. It will also works on any other machines you
have that have hydraulic brakes and clutches.
Emrah -
Saw the reply/instructions on how to bleed brakes. While this way WILL
work and there is absolutely nothing wrong with it, it is a big
misconception that you have to shut the bleeder valve between every
pump/squeeze of the lever. People do this on their cars too. Pump.
Open/Close. Pump. Open/Close. You really don't need to do this.
As long as you've got fluid flowing through the bleeder tube, you can
just keep pumping/squeezing the lever. Just make sure the reservoir
stays topped off. If you bleed it dry, you'll have to start all over
again.
If you don't believe me, just watch the fluid going down through the
(clear) tubing that you should use to bleed with. You pull the lever, a
bunch of fluid drains out. Now, watch the air bubble SLOOOOOWLY go back
up the tube. Yes, air will travel back up, but it takes it so long, you
can just keep pumping away and force more fluid out (and the air with
it). As long as fluid is going down the tube, no air can get back up
into it.
Try it, you'll see for yourself. Oh, and that garbage about "pressure
bleeding" that every car mechanic with his name embroidered on his shirt
seems to talk about, Faggedaboutit. If you pump away (with the bleeder
closed) to "pressure it up", all you're going to do is aerate the
perfectly-fine fluid.
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