Dot 3 or Dot 4?

[Shovelrick]

I’m draining the front res while changing front brakes would it make sense to change to Dot 4 from 3?

 

[cheveslakr]

I keep Dot3 on the shelf and only that. I drive my cars very sparingly and never on a course or treat the street as a road course. From what I know, the Dot4 sponges water quicker and has a higher boiling point, so if you beat on the brakes and don't mind flushing the system every 5 years or so, it might suit you to go Dot4.

 

[cage2592]

Or you can bypass the DOT 4 and go to a DOT 5.1 (NOT a DOT 5).

DOT 5.1 is compatible with DOT 3 and 4.
5.1 is better than both at heat resistant.
5.1 absorbs less water.
5.1 is less compressive for a tighter pedal.

 

[Derek69SS]

I use Prestone DOT4 in all the dailies, and flush when I replace pads, which isn't very often.

In the Chevelle I run Redline RL-600 DOT4, but I'm racing nearly every weekend.
I flush that at least twice a year to keep the boiling point high.