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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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Andrewh Online content
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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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Kelowna, B.C. Canada
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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
Joined: Jan 2003
Posts: 25,591
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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Omaha Ne
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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
Joined: Apr 2011
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West Palm Beach, Florida
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
Joined: Jan 2003
Posts: 25,591
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
Joined: Apr 2011
Posts: 1,520
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
Joined: Jan 2003
Posts: 5,788
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
Joined: Feb 2004
Posts: 7,194
Harrisburg, Pa.
screamindriver Offline
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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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