my 97 454 has a spongy brake lever. I have tried bleeding it, but i am not sure i have done it correctly. sometimes the brake lever is firm, but later it gets spongy. When i pump it with the master cylinder cap off, I almost always see some small bubbles. I can't find any leaks. I have had all 3 calipers apart and 2 had frozen pistons, of which i unfroze.
The pads are good.
the brake fluid is cloudy. should i drain it all the way out??? if so how do i do that.
can i rebuild the wilwood master cylinder, since it is original.

Also, the neutral start relay makes a buzzing sound sometimes. the battery and the positive cable is new. If i wiggle the relay, it starts working ok.