I just did a complete brake system flush 1 month ago and used this product... Nothing but stellar results... would have loved to replace the rotors and calipers and pads at the same time... but just the brake fluid really improved the feel of the system...
Sure is fine to use DOT 4. I wouldn't go with DOT 5 since that is silicone based which is best for boobs or race cars.
Not sure if there is a difference between fluid brands. I never felt it myself but it could be a placebo effect. Still, I would change the fluids every couple of years at least. Not sure exactly what the difference between DOT 4 and DOT 3 is besides the boiling point.
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