i have full integra brake swap on my hatch, the rotors are beefy and work way better than stock, but of course they still fade.

anyways, when they fade or get really really hot, i push the pedal and it goes to the floor, it aquires a lot more looseness and i was wondering where this is from. i mean, if the brakes are hot i could see them not working as good, but that shouldnt make the pedal push more in compared to when it is cold. my guess is that the brake fluid get so hot that it just compresses more or goes somewhere else when you compress it,

so i was wondering if maybe a dot 4 swap would do the trick. i have all oem stuff right now, but even if i had good pads and rotors they would still fade at some point.

and i could use some clean brake fluid anyways. also i havev stainless braided lines.

so if brake fluid will do the trick, how should i do this, do i have to drain ALL of the dot three, i mean, they shouldnt be mixed but to what extent?

thanks.

 

Yeah, what you're experiencing is the brake fluid boiling. When it boils, it creates little air bubbles in the lines which compress very easily & your pedal sinks to the floor.

Swap out the old fluid (probably a DOT3 rated) for a DOT 4 or 5, and you'll see a big improvement in that department. I use the Valvoline synthetic DOT 4/5 stuff for street driving. It won't hold up for serious track use, but for street & autocross it's perfect. It's also very easy to find & a LOT less expensive than something like Motul 600 or ATE Superblue.

Just follow the procedure in the Helms for replacing/flushing the brake fluid, it's pretty straightforward.