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Dirt Bike Mods & Maintenance
how do you put brake fluid in brake line and caliper?
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[QUOTE="rmc_olderthandirt, post: 1160666, member: 68872"] blarf: the "mighty vac" should be able to bleed the brakes without any additional steps. If you have drawn a significant amount of fluid through (which is sounds like you have) then it should be fine. If you aren't getting any brake action, then something is wrong. First question: Once you sucked the fluid through, did you close the bleeder nipple? That little fitting that you put the hose on for the Mighty Vac is also a valve. You open it (turn it counter clockwise) to allow brake fluid to escape. Close it (clockwise) to seal it off. It is important that you don't allow any air back in the bleed nipple before you close it. You should be able to twist it closed with the hose still attached. It is also important that you keep the master cylinder reservoir full so that you don't suck more air in. If you have fluid through the system, the bleed nipple is closed and you have no brake action at all then I would guess that you didn't assemble the master cylinder properly. Did you rebuild your master cylinder, or buy an entire new unit? Just in case the Mighty Vac approach isn't working for some reason, here is the way I recommend to go about bleeding the brakes. Note that this may require two people: 0) Attach a clear hose to the bleeder nipple, route the free end into a can/jar. Note, you may want to loosen the nipple first, and then leave the box end of the wrench trapped on the nipple by the hose. 1) Make sure the reservoir is full. 2) Squeeze the brake lever, hold it 3) open the bleeder nipple. You should see fluid and/or air move through your hose. 4) close the bleeder nipple. 5) release the brake lever. Repeat steps 1-5 a bunch. As you make progress the feel of the brake lever should improve each pass. You should also be able to see any air bubbles pass through the clear hose. On a car, the reservoir is large enough that you can make several passes before refilling but the reserovior on a bike is often so small that you should refill each time. If you allow the reservoir to run empty and get more air in the system you will have just wasted your time and brake fluid. When you are done, snug up the bleeder nipple. They don't need to be "tight" and if you over tighen them you can easily break them off and that can be a real bitch! Rod [/QUOTE]
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how do you put brake fluid in brake line and caliper?
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