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Old 09-25-2008, 01:57 PM   #11 (permalink)
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someone mentioned be careful if you switch to 'synthetic' brake fluid, so i'm trying to figure out as opposed to what 'non-synthetic' brake fluid would be.
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Old 09-25-2008, 02:27 PM   #12 (permalink)
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Default Brake Fluid Type?

Quote:
Originally posted by porcupine73
someone mentioned be careful if you switch to 'synthetic' brake fluid, so i'm trying to figure out as opposed to what 'non-synthetic' brake fluid would be.
I don't have a knowledgeable answer to your question, but our Owner's Manual cautions against mixing different types (e.g. DOT 3, DOT 4, DOT 5) fluids and it even discourages mixing different brands. Your best bet is to have a full flush done with either DOT 3 or DOT 4.
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Old 09-25-2008, 02:37 PM   #13 (permalink)
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Quote:
Originally posted by porcupine73
someone mentioned be careful if you switch to 'synthetic' brake fluid, so i'm trying to figure out as opposed to what 'non-synthetic' brake fluid would be.
I think it only applies to "silicone-based" brake fluid. I was in Walmart last night and they have Prestone DOT4 synthetic and one of the things listed on the back was something like "mixes with all conventional brake fluids." I think I remember the same thing being on the Valvoline Synpower DOT4 bottle too when I used to use that (otherwise I probably would have steered away).
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Old 09-25-2008, 02:51 PM   #14 (permalink)
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Quote:
Originally posted by johnson
If you have a large budget, ATE Superblue or Type 200 (they are the same except for the color) are very high-end DOT4 fluids. It will probably run you around $20 for a 1-litre sized can. Never used these (too expensive & I don't have the need for it), but I've heard they are good for racing/track use.
$20 a liter? More like $10-12 a liter
http://www.turnermotorsport.com/html...ODUCT_ID=ATESB
http://www.tirerack.com/brakes/ate/a...blue_fluid.jsp

I like switching between Superblue and Typ200 because they're essentially the same thing but the color difference makes full flushes easy. It's all I've ever run in my BMW and my motorcycle, and I plan on switching to it on my Scooby's first fluid change.

Besides, the confused look when people look at dark fluid in the master cylinder is priceless. "Dude, your brake fluid REALLY needs a change!"
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Old 09-25-2008, 03:15 PM   #15 (permalink)
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Quote:
Originally posted by johnson


I think it only applies to "silicone-based" brake fluid. I was in Walmart last night and they have Prestone DOT4 synthetic and one of the things listed on the back was something like "mixes with all conventional brake fluids." I think I remember the same thing being on the Valvoline Synpower DOT4 bottle too when I used to use that (otherwise I probably would have steered away).
Yeah, I think that the confusion is between silicone, and synthetic, people can have a tendency to swap the terms. DOT5 is typically has silicone in it, and that is why you don't want to use it. My understanding is that synthetics have higher boiling points than non-synthetics. So. . .stay away from "silicone" but I don't think there is any problem with synthetics.
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Old 09-25-2008, 04:56 PM   #16 (permalink)
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Quote:
Originally posted by porcupine73
What are some brands/types of 'non-synthetic' or 'conventional' dot3 or dot4 brake fluids?
Good article on this topic here: Clicky here
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Old 09-26-2008, 10:09 AM   #17 (permalink)
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Default Re: Brake Fluid Brands

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Originally posted by tirolerpeter


There are many major brands (Valvoline, Gunk, etc.) available. Look at the top of the brake fluid reservior. My vehicle is an 08 and it clearly states: "Use only clean, fresh (meaning that the fluid has not been standing around open to absorb moisture) DOT-3 Brake fluid." I can't imagine your 05 would specify the need for DOT-4 and definitely not DOT-5. You don't "race" or "AutoX" it, do you? The key to good fluid performance is keeping moisture out of it. Brake fluid absorbs water from the air (I believe the technical term is "hygroscopic.") over time. That is why it is good to change it. Also, the water that gets into the fluid tends to condense (after boiling from hot braking) in the wheel cylinders or caliper pistons. This can cause mushy brake action, and corrosion. Total replacement every couple of years is good, but a good "bleed" at each wheel positon annually also goes a long way to keep things healthy.
The manual says DOT 3 OR DOT 4 but I will also check on the cap. No I don't AutoX or race my OB.

Looks like Valvoline is probably the best at the moment.
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Old 09-26-2008, 10:38 AM   #18 (permalink)
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PDM-racing made a mistake and sent me Motul 600 synthetic brake fluid when I ordered the less expensive one. I've been using synthetics in my brake system for 6 years now. The big differences I understand is the synthetics absorb water faster and have higher boiling points.
I use synthetics in everything except power steering (because I've never had to change or add any). I will be flushing my 08 OB system next year. I do my brake systems every 2 years, mainly because I live in a high moisture climate.
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Old 10-01-2008, 10:31 PM   #19 (permalink)
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Since boiling the brake fluid in my Saab years ago I go with the best brake fluid I can get my hands on. Super Blue is usually my choice. IIRC they have a "non blue" version of the same fluid so you know when it's fully flushed out.

My understanding is that DOT 5 is no compatible with DOT 3/4 but DOT 3 and 4 are compatible with each other.
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Old 10-31-2008, 04:59 PM   #20 (permalink)
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Anybody have a set of instructions for a complete brake flush? I'm pretty sure I know all the basics but I don't want to miss anything.
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