Is anyone have dot 5.1 brake fluid in there car? How does it feel? Able to youse it with dot 3/4 fluid i hear.
First of all before anyone starts mixing things up… don’t confuse DOT 5 and DOT 5.1. DOT 5 is silicon based and should not be used. DOT 5.1 is glycol based like 3 and 4, so it can be used in our cars. It will feel the same as any other brake fluid. The main difference is that it has a higher boiling point. So, unless you are doing lots of heavy braking at a track day or in some other similar circumstances that you could potentially boil the brake fluid, you probably won’t be able to tell any difference. You wouldn’t want to use it “with” 3 or 4 either. If changing over to it, you would want to completely change to it and thoroughly flush the system.
Dry boiling point / Wet boiling point
DOT 3: 205°C (401°F) / 140°C (284°F)
DOT 4: 230°C (446°F) / 155°C (311°F)
DOT 5: 260°C (500°F) / 180°C (356°F)
DOT 5.1: 270°C (518°F) / 191°C (375°F)
Also I’ve read somewhere that if you were to mix dot 3 or 4 with a dot 5 silicone based brake fluid… your fluid will become slushy and will be fcuked!