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Old 04-14-2018, 02:49 PM
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Mightyvac Hand vac

Hi All,

I'm going to be changing out the fluid using a MightVac hand vac. I tried this about 3 years ago and kept getting bubbles in the line. Everything went ok but I had to manually do it with a person in the car pumping the brakes to be sure as I was kind of freaking out that there may be air in the line. Anyway I have been reading about putting grease around the bleeder nipple before attaching the hose. I have been getting conflicting reports on to what type of grease I should use. Some say to use silicone grease while others are saying to use regular grease. What do you thinking would work best? I think that some of that will get into the bleeder screw.

Thanks
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Old 04-16-2018, 09:23 AM
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Unless the bubbles from around the bleeder bother you, grease is not necessary. Bubbles are introduced in the exiting fluid stream only. Bubbles can't go upstream into brake caliper. The same reasoning applies to gravity bleeding, but you don't produce the bubbles due to very low pressure differential.

I've done vacuum bleeding w/o grease numerous times.

good luck
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Old 04-16-2018, 09:25 AM
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I've used the mityvac with all my past brake bleeding, no biggie! The type of grease doesn't matter, it's just there to prevent air from coming in. I personally used Crisco,
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Old 04-17-2018, 06:13 AM
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Thanks for the comments. Going to bleed these out this weekend. I assume DOT 4 is what to go with in terms of the fluid?

Edit: Looks like the Autozone DOT 3 has the highest wet boiling point (368 degrees) out of all of the fluids I have researched so far. Honda OEM has 284. Not sure what the flash point means but that's at 250 for the Autozone stuff.

Last edited by npolite; 04-17-2018 at 06:27 AM.
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Old 04-17-2018, 06:34 AM
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Also the edit was for DOT3 fluid. I think I can stay with that but the manual states to use only Honda OEM fluid.
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Old 04-17-2018, 08:47 AM
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for power steering and transmission, I use OEM oil, but for motor oil and brake, I use whatever
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