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Best alternative to DOT 5 break fluid?

Discussion in 'The Hokey Ass Message Board' started by Hapydz, Sep 11, 2010.

  1. I like to use DOT 5 beacuse it doesn't absorb moisture and it doesn't affect painted surfaces. What I don't like about it is that on this project, I'm having problems sealing the connections, even the premade ones. Any HELP with an alternative brake fluid recommendation, would be much appreciated.:confused:
  2. newsomtravis
    Joined: Jun 1, 2009
    Posts: 562

    from pville, ca

  3. while i have read countless complaints about it , i've never had ANY problems with DOT 5
  4. newsomtravis
    Joined: Jun 1, 2009
    Posts: 562

    from pville, ca

    its go its positives and negatives......good, it don`t eat paint, isn`t hygroscopic, and usually has a high boiling point, bads, expensive, hard to find, and it is more compressabe than a natural fluid, that being said, they both leak the same, so i donno why he wants to change brake fluid cause he has a leak...

  5. AlbuqF-1
    Joined: Mar 2, 2006
    Posts: 909

    from NM

    If the system previously had DOT3 or 4 in it, you need to really flush it before putting DOT5 in. Best to put 5 in a completely new system.
  6. This is a disheartening revelation.... mean there is brake fluid that doesn't eat paint?

  7. newsomtravis
    Joined: Jun 1, 2009
    Posts: 562

    from pville, ca

    yeah, that does suck that it doesn`t eat paint, one of my favorite patina
  8. ^it sucks because if I knew this before I wouldn't have had a leaky master cyl drip all over my frame rail and eat the paint off of it. :(
  9. newsomtravis
    Joined: Jun 1, 2009
    Posts: 562

    from pville, ca

    uuuuu.....sorry to hear that.......that really sucks......
  10. ^Just add it to a long list of stuff I've got to do anyway I suppose. LOL
  11. Chally
    Joined: Dec 18, 2006
    Posts: 155


    If you have a leak it ain’t the fluid. Silicone brake fluid isn’t going to be any more or less prone to leaking than any other type of brake fluid…
    I’ve been using Dot 5 since 1980 without a problem…
    Every Postal truck out there that looks like the space shuttle [the LLV] runs Dot 5…
    It’s not that hard to find if you take the time to look for it. $15 a quart and $40 a gallon...<O:p
  12. Kerrynzl
    Joined: Jun 20, 2010
    Posts: 2,283


    Are you using Silicone Brake fluid, or Synthetic?
    There is a difference.

    Silicone fluid in not hydroscopic, which is good for cars in storage [ but it is prone to leaking ]

    I have used "Motul" Dot 5.1 Synthetic fluid in my race car. It never leaks at all

    Their are plenty of good other brands available
    Why go over Dot 4?
    Are you planning on "boiling the fluid" on a regular basis?
  13. Francisco Plumbero
    Joined: May 6, 2010
    Posts: 2,531

    Francisco Plumbero
    from il.

    It does not eat paint, that sold it. If I said oh my golly I have a leak lets try something else what the heck would I do. Plumber. My life is leaks drips and blockages I fight Murphy's law every minute of every day. To me a leak or a drip is normal and expected, if I assemble something and it doesn't tear I expect Murph' to get me some other way.
    So relax, even the Plumber God has leaks. Want a few rules to live by that will give you a few less but still not make you absolutely perfect as there is no such thing.
    Clean, Clean, Clean, pigs have more leaks. Understand the sealing surfaces of the connection, 45 degree flares and 37 degree flares do not just kiss and make a perfect seal, tapered threads and running threads do not make good partners either. T tape is not for everything. No, It will not just magically rust up. Be thorough, test properly and take the time to test and then retest, if you have a drip don't go Ape Shit on it, go in 1/16 ths or 1/8th turns, you are sealing, if you still drip undo and rotate the sealing surfaces slightly and retighten, remember you are tightening to seal not kill crush destroy. The anecdote to Murphy's 1st law of drips, A leak does not know care or concern itself with what it's leaking nor does it care if it is leaking at 1/2 psi nor 1000 psi, it's just a drip, pompous and unconcerned, it's YOUR problem. Enjoy outsmarting the Murph'
  14. 29nash
    Joined: Nov 6, 2008
    Posts: 4,544

    from colorado

    Cutting to the chase, the type of fluid has nothing to do with leak-free connectins.....................
  15. 39 All Ford
    Joined: Sep 15, 2008
    Posts: 1,531

    39 All Ford
    from Benton AR

    LOL, I like all of that, I will have to add that I have bought expensive brake lines that just will not seal on the 45º I/F seat, they just won't.

    Sometimes you get ripped off.... :D
  16. EZrider
    Joined: Jan 19, 2006
    Posts: 46

    from Waco, TX

    check out this link;
    more info than you can get out of these yahoos.
    personally I would stick with the DOT 5.
    I put it in everything as I rebuild. Internal rusting is minimized (almost non existant)
    The system does need to be clean though.
    I would disassemble ALL the wheel cylinders & the M/cyl before putting Dot5 in.
    AND flush the brake lines w/ alcohol/methanol, then dry air.
    just my 5c worth.
  17. EZrider
    Joined: Jan 19, 2006
    Posts: 46

    from Waco, TX

  18. Astrochimp
    Joined: Sep 15, 2009
    Posts: 191

    from NE Mo.

  19. maniac
    Joined: Jul 11, 2005
    Posts: 539


    I don't even try anymore:D
  20. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 3,176

    Kiwi 4d

    Dot 4. The expesive dot 5 , sure it isnt hydroscopic and wheel cylinders wont rust. But its a pain on normal rubber seals, I kept having problems ,wilwood proportioning valve seals siezed. Fixed that, then rear wheel cylinders gummed up . Ditched the silicone and flushed it all down the drain , back to good ol dot 4. Down here dot 5 is something like $50 for a bottle smaller the regular fluid.
    Last edited: Sep 12, 2010
  21. zman
    Joined: Apr 2, 2001
    Posts: 16,594

    from Garner, NC

    hunh? every parts store I've been in the last few years has it as well as every motorcycle shop. You sure you're looking in the right place?
  22. newsomtravis
    Joined: Jun 1, 2009
    Posts: 562

    from pville, ca

    yeah, u can find it, but not at every corner store.......

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