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Old 10-07-2007, 05:15 PM   #1
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Default Brake Fluid Question

I have really nice Bendix brakes all around and well, I burnt my brake fluid. It'* pretty darn black. The question I have is, I see on the cap for the tank it says "Use only DOT3" but as I think I have heard, DOT 5 is a higher specification, more resistant to burning up? Not too sure about any of this, just heard a few things here and there in the past, figured I'd ask on here. I'm planning to flush the fluid and put new in, but can I use DOT5? Would it benefit me? If not, what is recommended?
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Old 10-07-2007, 05:20 PM   #2
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Do not use Dot 5...

Use the Dot 3...

But you can get a Big Bottle of Prestone Dot 3 Synthetic for $5-6 iirc

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Old 10-07-2007, 05:29 PM   #3
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Thank you
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Old 10-07-2007, 06:29 PM   #4
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Dot 5 is silicone based brake fluid. It will destroy your abs system if used in a dot 3 system. Dot 4 has a slightly higher temp rating and is compatable with Dot 3. Dot 5 is mostly found in motorcycles.
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Old 10-08-2007, 12:06 PM   #5
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DOT 5.1 is also safe to use in a DOT 3 system.

The real issue with DOT 5 (silicon base) is that it does not absorb water. All brake systems are vented and will slowly absorb water, with DOT 5 fluid the water stays separate and is heavier than the brake fluid. The water settles to the low points of the system causing ABS failures and worse. Water has a lower boiling point than even old DOT 3 fluid; the water that collects in the caliper can boil and cause a loss of brakes.
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Old 10-08-2007, 12:18 PM   #6
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Mike.. there'* a good chance unless you've flushed them recently that the color you see has been building over years.

Flush it clean and you'll be thrilled with the change in performance.
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Old 10-08-2007, 02:10 PM   #7
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Bill makes a good point. A full brake fluid flush every two years is a good idea.
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Old 10-08-2007, 04:21 PM   #8
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Thanks a lot once again guys, I'll do a full brake system flush and replace with that synthetic prestone dot 3 high temp brake fluid.
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