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DOT 5 brake fluid #1603199
04/04/14 08:13 PM
04/04/14 08:13 PM
Joined: Oct 2011
Posts: 290
Dayton, WA
wesgtx440 Offline OP
enthusiast
wesgtx440  Offline OP
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Posts: 290
Dayton, WA
Anyone upgrade from DOT 3 to DOT 5 brake fluid? and what do you need to do in order to do it?

Re: DOT 5 brake fluid [Re: wesgtx440] #1603200
04/04/14 08:15 PM
04/04/14 08:15 PM
Joined: Feb 2012
Posts: 4,443
Morristown Tn.
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71birdJ68 Offline
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Morristown Tn.
You need a lot of money, that stuff is higher than a cats back. I'm fix in to do mine.

Re: DOT 5 brake fluid [Re: wesgtx440] #1603201
04/04/14 08:19 PM
04/04/14 08:19 PM
Joined: Nov 2006
Posts: 4,670
Star Idaho
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67vertman Offline
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Star Idaho
Yes I did, when I went from disc/drum to 4 wheel disc.

I replaced the master cylinder at the same time. I flushed the lines with de-natured alcohol, but I understand that you do not have to. I then left the lines to dry overnight. Bleed them as usual, works great going on a year now.

One thing I did notice though, DOT5 seems to find the leaks better then DOT3, even a small amount of looseness in a fitting will cause it to drip.

Re: DOT 5 brake fluid [Re: wesgtx440] #1603202
04/04/14 08:36 PM
04/04/14 08:36 PM
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Millinocket, Maine
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JonC Offline
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I did it years ago, flushed lines with Brakleen and compressed air, no problems whatsoever with leaks etc. And don't have to worry about eating paint.

Re: DOT 5 brake fluid [Re: JonC] #1603203
04/05/14 12:15 AM
04/05/14 12:15 AM
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Omaha Ne
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TJP Offline
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Omaha Ne
Only thing I can add is that when bleeding with dot5 go slowly, if one goes to fast or uses to high of pressure it aerates and creates bubbles.

otherwise AWESOME!!!

Re: DOT 5 brake fluid [Re: TJP] #1603204
04/05/14 12:49 AM
04/05/14 12:49 AM
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new berlin wisconsin
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Mr T2U Offline
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new berlin wisconsin
if the dot 5 fluid is in a black bottle. remove the cap and foil seal, lightly re install the cap to let the air out. let it sit out in the sun for a few hours to force out the air bubbles that develop during shipping.

if in a light colored bottle. put it in a pan of hot water, about 200*, for about 15 min.


perception is 90% of reality
Re: DOT 5 brake fluid [Re: Mr T2U] #1603205
04/05/14 01:52 AM
04/05/14 01:52 AM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
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MI, usa
I use it in all 3 of my cars. Blow it out and bleed it. It will mix so it's not necessary to be perfect. After bleeding it'll be cleaned out. One car's had it over 20 years, no issues.
Doug

Re: DOT 5 brake fluid [Re: dvw] #1603206
04/05/14 02:03 AM
04/05/14 02:03 AM
Joined: Oct 2011
Posts: 290
Dayton, WA
wesgtx440 Offline OP
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wesgtx440  Offline OP
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Dayton, WA
Thanks everyone for the great feedback. I plan on changing my car over to it soon. Hopefully this will prevent a leaking master cylinder from completely ruining my paint again!

Re: DOT 5 brake fluid [Re: 67vertman] #1603207
04/05/14 11:38 AM
04/05/14 11:38 AM
Joined: Jul 2005
Posts: 1,300
Penna
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70satelliteguy Offline
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Penna
What is the big advantage of 05 over 03

Re: DOT 5 brake fluid [Re: wesgtx440] #1603208
04/05/14 01:37 PM
04/05/14 01:37 PM
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Posts: 15,194
Omaha Ne
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TJP Offline
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Omaha Ne
I would not advise mixing,

http://www.gabma.us/docs/dot5.pdf

Re: DOT 5 brake fluid [Re: TJP] #1603209
04/05/14 04:26 PM
04/05/14 04:26 PM
Joined: Nov 2003
Posts: 2,936
GA
roadrunninMark Offline
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GA
dot 5 won't eat paint nor collect moisture. Have it in my 71 barracuda project car. All brake parts are new so it was easy change over. Will go in RR too. It is pricey compared to 3/4.

Re: DOT 5 brake fluid [Re: 70satelliteguy] #1603210
04/05/14 05:17 PM
04/05/14 05:17 PM
Joined: Apr 2012
Posts: 18,880
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RSNOMO Offline
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Quote:

What is the big advantage of 05 over 03




First and foremost, paint friendly...

Does not absorb moisture...

Higher boiling point...


Research its development...

I've had Dot 5 in a '71 B-body for over 20 years...

I would never go back to DOT 3...

Re: DOT 5 brake fluid [Re: TJP] #1603211
04/05/14 05:34 PM
04/05/14 05:34 PM
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
Too Many Posts
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Rio Linda, CA
Quote:

I would not advise mixing,

http://www.gabma.us/docs/dot5.pdf





In order to get a DOT certification all brake fluids must be able to coexist in the same system without doing any harm. Silicone fluid and glycol fluid won't mix, they stay separate in the same system.


The INTERNET, the MISinformation superhighway
Re: DOT 5 brake fluid [Re: TJP] #1603212
04/05/14 05:35 PM
04/05/14 05:35 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
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MI, usa
Quote:

I would not advise mixing,

http://www.gabma.us/docs/dot5.pdf




I wouldn't mix it either. But if you drain , fill and bleed, I've never had an issue. You can tell by the color when all the old fluid has been bled out. Any minuscule fluid remaining has never caused a problem for me.
Doug

Re: DOT 5 brake fluid [Re: dvw] #1603213
04/07/14 12:04 AM
04/07/14 12:04 AM
Joined: Jan 2003
Posts: 5,788
Hamilton, Ontario Canada
Magnum Offline
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Magnum  Offline
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Hamilton, Ontario Canada
Quote:

Quote:

I would not advise mixing,

http://www.gabma.us/docs/dot5.pdf




I wouldn't mix it either. But if you drain , fill and bleed, I've never had an issue. You can tell by the color when all the old fluid has been bled out. Any minuscule fluid remaining has never caused a problem for me.
Doug




I agree, a thorough cleaning is not necessary. If it's of any concern to you. Bleed the system every couple years, at least a few pumps out the bottom.


69 Super Bee, 93 Mustang LX, 04 Allure Super
Re: DOT 5 brake fluid [Re: Magnum] #1603214
04/07/14 10:00 AM
04/07/14 10:00 AM
Joined: Jan 2003
Posts: 5,888
Athens, Greece
Pyper70 Offline
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Athens, Greece
Not to hijack but I am redoing the braking system on a 72 RR...Power Disc/Drum. I am replacing the brake lines front to rear. Going to rebuild the calipers and the wheel cylinders. The car is currently DOT3. Would you say to go to DOT4 or DOT5? What do I have to do to the Master besides Bench bleeding it? Do I need to clean it out with something?>


Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
Re: DOT 5 brake fluid [Re: wesgtx440] #1603215
04/07/14 10:19 AM
04/07/14 10:19 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
I used it in this car. I won't burn your paint off if you have a leak or bad cap. That said you have to empty the entire system, clean it and then you can add it. You can't mix the 2 as far as I know.


[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: DOT 5 brake fluid [Re: Mr.Yuck] #1603216
04/07/14 10:39 AM
04/07/14 10:39 AM
Joined: Apr 2005
Posts: 4,910
new berlin wisconsin
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Mr T2U Offline
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new berlin wisconsin
what kunkel said is correct.
federal LAW says DOT 5 brake fluid MUST be to coexist with other brake fluids without causing harm. if it wasn't it wouldn't be able to be sold in the US.

i don't have time to look this up and post it. it has been posted several times in the past.
do a goggle search on moparts to find lots of info on this subject.

Last edited by Mr T2U; 04/07/14 10:49 AM.

perception is 90% of reality
Re: DOT 5 brake fluid [Re: Mr T2U] #1603217
04/07/14 11:09 AM
04/07/14 11:09 AM
Joined: Jan 2008
Posts: 1,206
Minn
S
SportF Offline
pro stock
SportF  Offline
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Joined: Jan 2008
Posts: 1,206
Minn
Quote:

what kunkel said is correct.
federal LAW says DOT 5 brake fluid MUST be to coexist with other brake fluids without causing harm. if it wasn't it wouldn't be able to be sold in the US.

i don't have time to look this up and post it. it has been posted several times in the past.
do a goggle search on moparts to find lots of info on this subject.




This subject comes up all time on boards all over the place. Mr. Kunkle is correct. I am amazed that someone would think you could sell a simple product, that if used wrong, could cause a failure and kill...thousands... world wide. Wikipedia says mixing will cause failure....I don't believe it, the legal implications of that are mind boggling.

As I understand it, it was developed by either (or both) the Military or Post office as they felt the DOT 3 stuff wasn't the best for their equipment, which sits around a lot not being used. Its good stuff, use it.

Re: DOT 5 brake fluid [Re: SportF] #1603218
04/07/14 01:12 PM
04/07/14 01:12 PM
Joined: Jan 2003
Posts: 16,376
D
dogdays Offline
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The link above is to a personel anecdote, has nothing to back it up. I wish it'd go away. Oh that's right, it's the Internet so it must be right. And, Wikipedia is full of errors. It ain't the Encyclopedia Britannica.

R.

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