I was just reading about brake fluids and the pros and cons of DOT fluids or mineral oil. Also the benefit of DOT 5 being the least water attracting of them all.

Can we use DOT 5 in our bumps?

 

Don't think so.. all traces of DOT3 would have to be removed. Dunno if seals n stuff are formulated for it.

 

You would think that today they could come up with something better. I guess it's good for business though.

 

I'm using a syn. Dot 4 in my F250

 

Front disc or drum?

How's it working?

I'm asking because I am planning on replacing all my lines, calipers and either rebuilding or buying new rear cylinders.

Now that I saw the thread on the MC/Booster upgrade I'm thinking about that too.

This may not be a rotisserie resto but it will be as good as I can get w/o it.

 

I'd recommend more research, it is my understanding that you do not mix, but I don't know if you were starting over that the newer 5 couldn't be used.

I haven't wanted to so it has not been on my plate.


John

 

I've read if your going to use the newer dot 5 stuff everything needs to be cleaned and washed all of the older fluids with Denatured Alcohol.

Then reassembled with the newer dot 5. Also disassembling M/C will need to be done, And replace the all lines if needed and the clean the P/Valve then you can use new dot 5 stuff.

I was going to go with it but, hell too damn much work for me.

I'll just keep using the old dot 3/4 stuff since it's worked okay if a person flushes the old fluid every couple of yrs. or so.
Orich

 

If you're buying a DOT 3/4/5.1 brake fluid that's touting it's a synthetic, that's sort of a deceptive marketing ploy. There isn't any new, modern advanced techology for the formulation of brake fluid.

Brake fluid isn't a petroleum-based product and the seals in the brake system are not compatible with petroleum-based oils. Outside of DOT 5 (silicone brake fluid), DOT 3/4/5.1 brake fluid is a synthetic and always has been since the first uses of hydraulic brakes.

 

Why change out something that has worked for 50 years?

 

Plus with the old dot no need for warning tag to only use dot 5. fluid.

Mixing the two fluids 3,4 & 5,1 with dot 5 is like mixing these two paints together of different types Enamels & Lacquer paints that will cause your brakes to slowly lock up once it works into your M/C good
Orich.

 

"For automotive use, the three most common types of brake
fluid are Dot 3, Dot 4 and Dot 5. The Dot 5 fluid has
limited application, primarily military use vehicles. The
differences in the fluids are in the boiling points (see Fig.
2), with the exception of the Dot 5 fluid, which is a silicone
based fluid and is not compatible with other fluids. The
silicone fluid is non-hygroscopic; therefore any moisture
in the system will accumulate in low areas, promoting
corrosion. The silicone fluid can damage the seals, as
it lacks additives that lubricate the rubber components.
The silicone based fluids are compressible, resulting in
a soft or spongy pedal sensation. While the Dot 3 and
Dot 4 fluids could conceivably be interchanged, some
vehicle manufacturers caution against this procedure.
To be safe, only install the fluid specified by the vehicle
manufacturer."

Full text of the article in this link (PDF file).

http://r.search.yahoo.com/_ylt=AwrTc...evNNhnu3m3SjA-