De-gassing DOT 5.1 Fluid?

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  • De-gassing DOT 5.1 Fluid?
  • brakes
    Member

    is that where you pressurise the system to force the air out?
    I’ve done this, but found if you do it too hard you force oil past the seals.
    bleeedin Avids.
    not literally.

    bluebird
    Member

    Not an expert, but trapped air is the enemy of hydraulic brakes. It takes a couple of minutes to do, so why not?

    stevious
    Member

    I know why I should, just wondering if anyone’s got any experience of NOT de-gassing their fluid.

    Premier Icon michaelbowden
    Subscriber

    I have never de-gassed brake fluid on any of the brakes I’ve bled. Be it cars, bike or cycles, 20 yrs in the motor trade.

    Goz
    Member

    For the time it takes yes, wether it makes a difference im not sure, say with avids you draw back on the caliper siringe and you draw air from the system, you’ve air in the fluid/siringe!

    stevious
    Member

    Anyone bleed their brakes without degassing the fluid? Does it make much difference?

    I know in theory that it *should* make a difference but can’t help but think it’s a faffy waste of time.

    Premier Icon Mad Pierre
    Subscriber

    Never even heard of it before now!

    Premier Icon Northwind
    Subscriber

    I’d never heard of de-gassing til I started doing pushbike brakes. I’m not sure it makes any difference, but, it doesn’t hurt to do it I figure. (degassing half a litre of fluid to do the car would be a bit more of a hassle!)

    yetivaud
    Member

    I put the brake fluid in a vacuum chamber once, and set the chamber to a pressure of 0.1mtorr. Lots of bubbles came out of the fluid during the degassing. I then used that fluid to bleed my brakes with….. Can’t say it was actually noticable when riding the bike though.

    UrbanHiker
    Member

    “I put the brake fluid in a vacuum chamber once…” this is why i love STW participants.

    So come on then, how do you de-gas during a normal bleed?

    stevious
    Member

    De-gassing for a normal bleed is just when you take the syringe of fluid, close the stopper and draw the plunger out a bit. The resulting vacuum forces gases dissolves into the fluid to come out. You then get rid of the bubbles as you normally would and then resume.

    Since my last post I’ve bled both of my brakes, did one de-gassed and then left the other as it was from the bottle. It seems that for Avid brakes (where you bleed by negative pressure) the de-gassing is worthwhile as when you’re bleeding the caliper/lever you need to pull on the plunger just as you would when de-gassing. If you haven’t de-gassed already you get those bubbles during the bleed anyway.

    z1ppy
    Member

    IIRC someone mentioned popping it in the freezer degasses it..

Viewing 12 posts - 1 through 12 (of 12 total)

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