Brake and clutch oil change with Mityvac

[Baloo]

Hi all,

I finally got a mityvac after reading here that it was very easy to change the fluids using this tool.

I never did that job before, so I am not too sure how to do it...  I guess that you hook the pump to the bleeder, pull a vacuum, then open the bleeder, right?

Do you keep doing this and filling the master cylinder with new oil until you can see clean oil being pulled in the Mityvac container?

Is it the correct way to do it, or am I completely wrong?

Help from those who did the job using this tool will be greatly appreciated!

Thanks!

[Thunderbolt]

Helps to have some one up top to make sure it doesn't get too low, if so you will have to start over.  Helps to loosen the clamps for the handlebars to level the reservoir.

[Bone]

Once you use the tool a couple of times it will get better. I take the vac and suck out the dirty fluid from the top of the reservoir. Fill it with new fluid and then go to the bleeder. You can see the clean, new fluid when it gets to the bleeder.
The way you explained the process is the correct way. Like Thunderbolt stated don't let the level get to low air will be drawn into the system.

[sandy]

Bone has the right process if your old fluid isn't too dirty. If it is very dark or black, you might want to flush all the old junk out. I pull all the old fluid out. Then refill with 99% Isopropyl alcohol and pull that through the system. Dry out the reservoir and refill with DOT4 fluid and then bleed normally using the vac tool. Been doing this on several bikes for years with no problems.

[old2soon]

Bafore even using my vac-went to the dollar store( as in nothing over one dollar) and bought two of those turkey baster thingys. Used that baster thingy to suck out most of that old nasty fluid. Worked like a champ!! It goes way quicker on bleeding those brakes  and clutch with an extra set of hands. If you steal mamas out of the kitchen-buy her a new one-Do not under ANY circumstances put it back to food use after using it to suck up brake fluid. RIDE SAFE.

[Bobbo]

When drawing fluid from the bleeder, you will often see bubbles.  That is air going into the threaded part of the bleeder, and into the tubing.  You can eliminate it by sealing around the bleeder threads with a dab of grease.

[valkyriemc]

FWIW -your going to be adding new fluid into the two resevoirs several times, so its in your best interest to cover the bike/tank/fender with some big towels or an old blanket. (And I take one small towel and wrap it tight around the resevoir that I'm working on). One screw up with brake fluid on the bikes paint is all it takes.  

[Sodbuster]

FWIW -your going to be adding new fluid into the two resevoirs several times, so its in your best interest to cover the bike/tank/fender with some big towels or an old blanket. (And I take one small towel and wrap it tight around the resevoir that I'm working on). One screw up with brake fluid on the bikes paint is all it takes.  

[roboto65]

I have a Mitivac and pull mine dry then use a Qtip to clean out the hard to reach spots refill and rebleed nice and clean for another year or so..

[Baloo]

Ok guys! Thanks for the advises! I think I found what to do on the next rainy day around here...