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DOT 5 brake fluid #1603199
04/04/14 08:13 PM
04/04/14 08:13 PM
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Dayton, WA
wesgtx440 Offline OP
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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
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Morristown Tn.
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71birdJ68 Offline
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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
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Star Idaho
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67vertman Offline
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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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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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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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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
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MI, usa
dvw Offline
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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
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Dayton, WA
wesgtx440 Offline OP
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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
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Penna
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70satelliteguy Offline
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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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Omaha Ne
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TJP Offline
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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
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GA
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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
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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
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Rio Linda, CA
John_Kunkel Offline
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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.


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Re: DOT 5 brake fluid [Re: TJP] #1603212
04/05/14 05:35 PM
04/05/14 05:35 PM
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MI, usa
dvw Offline
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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
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Hamilton, Ontario Canada
Magnum Offline
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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
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Athens, Greece
Pyper70 Offline
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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
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Brookeville, Md
Mr.Yuck Offline
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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.


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Coming soon!!!!
Re: DOT 5 brake fluid [Re: Mr.Yuck] #1603216
04/07/14 10:39 AM
04/07/14 10:39 AM
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new berlin wisconsin
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Mr T2U Offline
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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
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Minn
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SportF Offline
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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
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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.

Re: DOT 5 brake fluid [Re: dogdays] #1603219
04/07/14 01:18 PM
04/07/14 01:18 PM
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Kelowna, B.C. Canada
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DPelletier Offline
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Yep, while it makes sense to drain and flush your system when going from glycol based fluid to silicon based fluid, having both will not cause catastrophic failure.

I use Dot 5 on my restored 'Bee because I don't want paint damage. On all my other vehicles and motorcycles, I use Dot 4.


Dave


1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]
Re: DOT 5 brake fluid [Re: DPelletier] #1603220
04/07/14 02:13 PM
04/07/14 02:13 PM
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it isn't that it won't function if you mix the two.
it is you won't get the benefit of full silicone if you mix.
in other words some of the left over dot 4 could still melt your paint.

Re: DOT 5 brake fluid [Re: Andrewh] #1603221
04/07/14 03:42 PM
04/07/14 03:42 PM
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Quote:

it isn't that it won't function if you mix the two.
it is you won't get the benefit of full silicone if you mix.
in other words some of the left over dot 4 could still melt your paint.




I'm aware of that; I was confirming that nothing catastrophic would happen to your braking if some Dot 3 or 4 was left in the system.

In my case, EVERYTHING was new; calipers, wheel cylinders, hoses, lines, master, etc. so there was no existing Dot 3.

Dave


1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]
Re: DOT 5 brake fluid [Re: Pyper70] #1603222
04/07/14 04:30 PM
04/07/14 04:30 PM
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Rio Linda, CA
John_Kunkel Offline
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Quote:

Would you say to go to DOT4 or DOT5?




The choice is yours based on the info here but be advised that silicone DOT 5 often gives a spongy feel to the pedal (air entrapped in the fluid)....that has been my experience and others report it too.


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Re: DOT 5 brake fluid [Re: John_Kunkel] #1603223
04/07/14 05:35 PM
04/07/14 05:35 PM
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We've done over 100 cars with dot5 and have not experienced any noticeable difference. I will clarify that these are street driven cars not on the track.

Re: DOT 5 brake fluid [Re: John_Kunkel] #1603224
04/07/14 06:10 PM
04/07/14 06:10 PM
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Copper Dart Offline
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as i understand it, and i may be wrong (again) dot 3 brake fluid is hydroscopic and can/does absorb H2o effectively diluting it throughout the entire brake hydraulic system. If H2o finds its way in (and it will) dot 3 can handle a considerable amount of moisture (relatively speaking) without it severely affecting its performance, and by diluting it, the corrosiveness is greatly reduced. Dot 5 on the other hand, isn't as friendly to H2o. Water can and does find its way in and accumulates in condensed ratios causing very focused corrosion of the brake system components.

I know I've been bumped on the head many times and may be way off so check for yourselves, as for me, I will be using Dot 5 in my classics when possible, just don't rely on it lasting forever on cars that don't see much drive time regularly.
"You get what you pay for"


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Ricky Valdes
Re: DOT 5 brake fluid [Re: Copper Dart] #1603225
04/07/14 06:45 PM
04/07/14 06:45 PM
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NotRussia
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Sorry if O/T, but can it be used for hydraulic clutch TO bearings?

Re: DOT 5 brake fluid [Re: 2fast4yourBrain] #1603226
04/07/14 07:01 PM
04/07/14 07:01 PM
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Rio Linda, CA
John_Kunkel Offline
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Every aftermarket hydraulic TO bearing that I've researched says no DOT 5 fluid. Dunno why.


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Re: DOT 5 brake fluid [Re: John_Kunkel] #1603227
04/07/14 07:41 PM
04/07/14 07:41 PM
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dogdays Offline
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Probably difficulty in bleeding the air out of the clutch system. Many of them are hard enough to bleed with DOT3.

If the silicone brake fluid has a problem it is with air entrainment. That is well-known, it'd probably respond to backwards pressure filling from the bottom of a can. Air gets entrained from shaking or from a free jet entering the liquid's surface in a container.

Now on the DOT3...if you think that DOT3 is better because it absorbs water, you haven't ever had your brakes vaporlock. I have. It's not a happy feeling to be facing a seven mile 8% grade and have the brake pedal go to the floor.
The brake fluid maximum boiling temperature is with the fluid being completely dry. As the hyGroscopic brake fluid picks up water, the boiling point decreases. That's one reason to change your brake fluid every couple of years.

So take your pick, use what you like, but don't think that just because the brake fluid absorbs the water that it's better!

Oh, one more thing...the DOT3 will hold different amounts of water depending on the temperature. So if the brake fluid is saturated with water and the temperature drops, what happens to the water? It comes out of solution and forms water pockets in the low spots. That's why brake cylinders have rust pits in the bottom of the bore.

R.

Re: DOT 5 brake fluid [Re: dogdays] #1603228
04/07/14 07:56 PM
04/07/14 07:56 PM
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West Palm Beach, Florida
Copper Dart Offline
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VaporLocked Brakes? Never heard of that before.
Ill consider it another lesson on how little i know.


Common sense, the least common of all the senses.
Mom.

For fear of ridicule, society stifles creativity.
Ricky Valdes
Re: DOT 5 brake fluid [Re: Copper Dart] #1603229
04/11/14 11:12 AM
04/11/14 11:12 AM
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Hamilton, Ontario Canada
Magnum Offline
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Quote:

Dot 5 on the other hand, isn't as friendly to H2o. Water can and does find its way in and accumulates in condensed ratios causing very focused corrosion of the brake system components.





Both fluids can function perfectly, just bleed the system every 3-5 years.

If you chose a small interval, just bleed a few pumps at each corner. A thorough flush is not necessary.


69 Super Bee, 93 Mustang LX, 04 Allure Super
Re: DOT 5 brake fluid [Re: Magnum] #1603230
04/11/14 06:56 PM
04/11/14 06:56 PM
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Harrisburg, Pa.
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Quote:

Quote:

Dot 5 on the other hand, isn't as friendly to H2o. Water can and does find its way in and accumulates in condensed ratios causing very focused corrosion of the brake system components.





Both fluids can function perfectly, just bleed the system every 3-5 years.

If you chose a small interval, just bleed a few pumps at each corner. A thorough flush is not necessary.



And that's what I've found also...the moisture gets in past the caliper and wheel cylinder pistons... As stated a few pumps off each corner every year will keep the system fresh..You can definitely see the fluid color change at the working ends of the system..

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