Well here is the deal. I have a 1990 honda accord lx 4dr. In the summer months or when it gets hotter than 70-80 degrees and I have my AC on sometimes the brake pedal will go all the way to the floor and my stopping power is obviously next to gone. But at night or at cooler temps no problems. Even when its hot out and I don't have my AC on it will do it but not as soon. I am STUMPED. I asked my brake guys and they have no clue (go figure) but the only thing I could come up with was my master cylinder is going out and the heat from the engine is heating up the brake fluid or I have water in my brake lines (even more wonderful). A little help would be much appreciated.

 

try the accord forum