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Leave the lid off the master while bleeding?

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G

Guest

Guest
I ran my calipers & master cylinders front & rear through my ultrasonic cleaner. They came out perfect so I reassembled them & am getting ready to bleed my brakes.
My question is, can I leave the top off the master while I bleed them as long as I keep it full of fluid or do I need to screw the top back on each time?
I'm just trying to make sure I don't add any additonal air to the fluid.
 
You don't have to put on the lid but watch the return port squirting.
 
Paul...ever so slightly wiggle the lever and youll get tiny bubbles to come out the return. this is getting some of the air out of the piston and bore. Use of a mighty vac eliminates the need for this, of course.
 
Mc

Mc

I'm using a pump to force the Dot3/4 fluid on my new braided line and rebuilt caliper.



I've also kept the MC cover off and see the little bubbles coming out the second hole inside the MC. I'll re-engage soon because the weather is getting warmer here and I wanna ride. Good luck with your's.



Ed
 
Last edited:
nastyjones said:
I ran my calipers & master cylinders front & rear through my ultrasonic cleaner. They came out perfect so I reassembled them & am getting ready to bleed my brakes.
My question is, can I leave the top off the master while I bleed them as long as I keep it full of fluid or do I need to screw the top back on each time?
I'm just trying to make sure I don't add any additonal air to the fluid.
Click to expand...


Yes you can do it with the cap off and it's required if you do the bump method.
Don't forget to cover your tank and the surrounding area with rags, just in case.

I used the lever bump method and it worked great.
Once you see the bubbles coming up you will know how much to bump the lever, I used short fast bumps on the lever, about 1/2" travel and after 15 seconds I would squeeze the lever in all the way very carefully to test for resistance.
It took only a few minutes before I started to feel pressure and a few more minutes and it was done.

I needed only one or maybe two top ups during the process.
 
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