Brake Failure At the Track
Did a rally this weekend, which included 2 track days,
On the first track day, about 15 laps in on the third session at the end of a small straight I was able to bring the car down from speed fine but when I went to the brakes in the next corner the pedal fell nearly to the floor.
I could pump it back up with 2-3 pumps and get some semblance of braking, but when it was happening it felt like I sprang a pinhole leak in one of the lines. I expected to see a puddle of brake fluid on the ground but after about 5 minutes sitting the pedal pressure came back to normal and stayed that way.
The track is Canaan up in NH, a small tight ex go kart track.
Car is a Rev 400 on R888Rs
And I had just put new RC5+ pads on the night before with fresh Motul 600.
I ran at this track last year, and didn't have a problem, but the brakes were smoking (grease burning off the back of pads and pins I'm guessing)
So this was unexpected, and these sessions weren't even 20 minutes.
Also I've developed what sounds like a brake pad rattle up front (since the pad swap) which hasn't gotten any better even after 2 track days. At low speeds it can be loud and really annoying, touch the brakes and it goes away or increase spead and it goes away.