Join Date: May 2015
Location: Marietta, GA
Year/Make/Model: 2010 Kawasaki Voyager
All DOT 4 brake fluid is made from the same base - Polyethylene glycol (PEG) and all PEG is synthetic. There is no standard for the use of the word "synthetic" when applied to DOT 4. Some manufactures just slap it on any old DOT 4. Others use is to indicate that the process used to make the PEG produced longer molecules of more consistent size. What you should be looking for is the dry/wet boiling points. The higher these both are, the longer and more consistent size the PEG molecules are. Higher molecular weight PEG should last longer and absorb moisture less than lower molecular weight PEG.
Cheap DOT 4, made by conventional processes are usually pretty compatible, but you do not want to mix DOT 4 of different boiling points unless you mix them in a single container before you use them. Even then, there is some risk of separation due to the additives used regardless of the relative boiling points. Once in the brake system, they will not mix much and you get zones with different boiling points, compressability, and moisture absorption rates. Not good. Best to completely drain the system, add one single brand/grade of fluid, and drain again before the final filling.
A yellow bottle does not indicate the quality of the brake fluid. You can find high boiling point DOT 4 in red, black, blue, and yes, even yellow bottles.
Regardless of molecule size, PEG will damage paint. Larger molecules may slow down the rate of damage, depending on the quality of the vehicle paint, but it will still do damage.
RAM mount for TomTom Rider 400 (with anti theft module)
6000k LED Headlight & Spots; Kisan Headlight Modulator (works with LEDs),
__Brake Light Modulator, LED License Plate Holder
Dobeck EJK 3.0
Lucky Mirror Extenders
Misc. RAM Mounts for Cup Holder, SPOT, Phone, etc.
Chuckster BAK, Trailer Hitch and Cooler Rack
Wiring for Trailer
Ray's Throttle Mod
Things to do:
Drilling Baffle Plates (Maybe)
Paint HF Tag Along Trailer to Match Bike