C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Different brake fluid color?

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Old Feb 17, 2010 | 12:32 PM
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Default Different brake fluid color?

My DD needed some brake fluid so off to AZ I went and bought DOT 3 fluid. I thought I'd look in my 91 vette, and the fluid in there is a darkish brown color, and the fluid in the new bottle is clear?

Whats up with the diff. colors?
OK to use in vette, just add it?

Just PROVES how much of a nOOb I am.
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Old Feb 17, 2010 | 12:39 PM
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The old brown stuff was clear when it was new also. The fluid turns color from time, and temperature.

Sounds like doing a complete flush would be a good thing to do.
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Old Feb 17, 2010 | 12:51 PM
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Originally Posted by pcolt94
The old brown stuff was clear when it was new also. The fluid turns color from time, and temperature.

Sounds like doing a complete flush would be a good thing to do.
What's the best way to do that? I've never gotten a good answer.
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Old Feb 17, 2010 | 12:52 PM
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Thanks for the unbelievable fast reply.

I'll go ahead and flush the brake fluid then.

Thanks again
James
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Old Feb 17, 2010 | 12:52 PM
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Originally Posted by miscstudent
What's the best way to do that? I've never gotten a good answer.
Ditto.......?
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Old Feb 17, 2010 | 01:02 PM
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Originally Posted by Jamesnns
My DD needed some brake fluid so off to AZ I went and bought DOT 3 fluid. I thought I'd look in my 91 vette, and the fluid in there is a darkish brown color, and the fluid in the new bottle is clear?

Whats up with the diff. colors?
OK to use in vette, just add it?

Just PROVES how much of a nOOb I am.
Time for a complete brake system flush. Get yourself a set (four) of
"speedbleeders"....they make it a fast, one man job.
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Old Feb 17, 2010 | 01:06 PM
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brake fluid is hygroscopic, which means that it absorbs water...it should be flushed every 2 years...all the crud settles in the calipers; also the water that collects in it causes the brake fluid to boil when subjected to periods of excessive heat, and thats bad
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Old Feb 17, 2010 | 01:10 PM
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Originally Posted by miscstudent
What's the best way to do that? I've never gotten a good answer.
That’s because there is no one right answer. There are several ways to do it depending on your equipment of what you use and if you work alone or have help.

You can pressurize the master and force it out each wheel cylinder. You can use a vacuum device and suck it out of each wheel cylinder. Or you can use speed bleeders and use the brake pedal to bleed the system. And if you have help, do it the old fashioned way of using two people and one pumps while the other opens and closes the wheel cylinder.

This is not the whole list but the major ones used. People usually find what works best for them and the car after they have tried several.

I have all that darn stuff but I think speed bleeders work pretty good, each to his own.
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Old Feb 17, 2010 | 01:15 PM
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Originally Posted by pcolt94
That’s because there is no one right answer. There are several ways to do it depending on your equipment of what you use and if you work alone or have help.

You can pressurize the master and force it out each wheel cylinder. You can use a vacuum device and suck it out of each wheel cylinder. Or you can use speed bleeders and use the brake pedal to bleed the system. And if you have help, do it the old fashioned way of using two people and one pumps while the other opens and closes the wheel cylinder.
This is not the whole list but the major ones used. People usually find what works best for them and the car after they have tried several.

I have all that darn stuff but I think speed bleeders work pretty good, each to his own.
I think I've done this before, many years ago.
Just loosen the nipple while your friend pumps the pedal, repeat until you get clear fluid.
Right?
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Old Feb 17, 2010 | 01:17 PM
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Originally Posted by runner140*
Time for a complete brake system flush. Get yourself a set (four) of
"speedbleeders"....they make it a fast, one man job.
I'll look into this, I have multiple cars so it'd be a good investment.

Opps, not a tool, sorry.....

Last edited by Jamesnns; Feb 17, 2010 at 01:21 PM. Reason: Cause I'm a nOOb.......
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Old Feb 17, 2010 | 01:27 PM
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Originally Posted by pcolt94
That’s because there is no one right answer. There are several ways to do it depending on your equipment of what you use and if you work alone or have help.

You can pressurize the master and force it out each wheel cylinder. You can use a vacuum device and suck it out of each wheel cylinder. Or you can use speed bleeders and use the brake pedal to bleed the system. And if you have help, do it the old fashioned way of using two people and one pumps while the other opens and closes the wheel cylinder.

This is not the whole list but the major ones used. People usually find what works best for them and the car after they have tried several.

I have all that darn stuff but I think speed bleeders work pretty good, each to his own.
Awesome thanks! Any recommendations for speed bleeders?
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Old Feb 17, 2010 | 01:52 PM
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Originally Posted by Jamesnns
I think I've done this before, many years ago.
Just loosen the nipple while your friend pumps the pedal, repeat until you get clear fluid.
Right?
Open bleeder
push pedal (requires a second person)
Close bleeder
release pedal
repeat

Keep going till it looks clean ( and no air if you've replaced a hose, etc.) I put a clear hose on the bleeder and run it into a white margarine container.

If the pedal is released while the bleeder is open you'll suck air back in.
Start with the furthest wheel and end with the closest. Keep an eye on the level in the master cause you don't want it to run dry and suck air.
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Old Feb 17, 2010 | 01:57 PM
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Originally Posted by murray59
Open bleeder
push pedal (requires a second person)
Close bleeder
release pedal
repeat

Keep going till it looks clean ( and no air if you've replaced a hose, etc.) I put a clear hose on the bleeder and run it into a white margarine container.

If the pedal is released while the bleeder is open you'll suck air back in.
Start with the furthest wheel and end with the closest. Keep an eye on the level in the master cause you don't want it to run dry and suck air.
Yep, that's how I did it, minus the hose leading to a container, I just let it bleed to the ground. I was younger then...oops
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Old Feb 17, 2010 | 04:43 PM
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I use a vaccum bleeder.
I've been eyeing a motive power bleeder for my next purchase.

I had to replace the master and all 4 calipers to stop seeing a grey fluid.
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Old Feb 17, 2010 | 05:18 PM
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Originally Posted by pcolt94
The old brown stuff was clear when it was new also. The fluid turns color from time, and temperature.

Sounds like doing a complete flush would be a good thing to do.
just as oil is a nice golden color (unless it royal purple) when new & turns dark with use.
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Old Feb 17, 2010 | 05:29 PM
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speed bleepers work for bleeding but don't leave 'em in permanently...'budget' bleeder: use a short piece of vinyl hose and a clothes-pin, loosen the oem bleeder only enuf to pass fluid when pedal is pressed (too loose lets air back in on pedal return)...recheck m/c level after every 5 pedal strokes to prevent suckin wind.
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