Ok, first off I searched and didn't find anything that really answered my questions.

I have an EG with GSR swap with Peakboost kit with about 300 whp. The engine bay is normally pretty toasty after the car has been running for awhile. I have been having a slight overheating issure when running on the highway, but that is another story.

I am having issues with my brakes. Two weekends ago I was drag racing and lost brake pedal pressure. I had run the car a few times down the track. I checked the brake fluid and no leak. I decided to pop the hood and let the car cool down for about 20-30 minutes. Got back in the car and had brake pressure. The car will stop when I lose pedal pressure, but it takes a few extra pumps.

I think I am boiling my brake fluid from manifold's heat. Has anyone else ever had this problem?

 

i have this same problem on long spirited runs. only when its warm out side and my engines been running for quite sometime will this happen. i was considering replacing my master cylinder and switching to a some better ss lines and better fluid.

 

I have put a lot of thought into this. I was like it can't be a leak because I'm full on fluid. I don't think its my vac. source because the pedal pressure comes back after the car cools down a bit.

I am probably going to run some air duct to the radiator and get a bigger fan. I have already wrapped the manifold and downpipe and spaced the hood out. There just isn't any room for air flow to get to the radiator.

 

at one point i wanted to say the rotors are getting too hot but why would the pedal seep in.

im almost positive that its the fluid. i've heard only good things about the blue stuff. search up on some fluid.

 

That or you have one of three other things:

1. Caliper isn't releasing all the way
2. Still have air in the system
3. Obstruction/contaminated line somewhere.

 

i've had the same problem on both brake setups and have been bleed numorous of times. i have doubted myself of user error but then i let 2 other people do the bleeding for me and still same result.


the line could be a possibilty hence why i figured i would swap out the lines as well.

 

I would be really surprised if your under hood temps were high enough to boil brake fluid.

I would recommend flushing your brake system and refilling it with fresh fluid.

Also, it would help to keep your underhood area cool if you removed the weather stripping from your hood (near the cowl).

 

Also, what sort of pads are you using? OEM Pads overheat very quickly and old fluid which has absorbed water will boil at a much lower temp. Pick up some Hawk pads (EBC is junk, don't even bother) and some good fluid and you should be able to make hard stops all day long.

 

Engine bay temps shouldn't be high enough to boil brake fluid... I think the most likely cause it a bad master cylinder...

 

y
ea, did you upgrade you master cylinder?

I't would be that you MC is too small or your overheating your brake pads.

I was running stock VX brakes, a little over 300whp and after 1 heavy stomp on the brakes, there were no brakes at all. That is until they cooled down some.

I upgraded brakes too (GSR) and all is good now.