I had my brake fluid flushed a few months ago. Since then, the ABS system seems to cycle more than normal (but still, only for a few seconds most of the time I start the car). Also, since then, the brake pedal sinks to the floor (only in hot weather with the AC on, and only during gradual stops).

Today, the ABS light came on; the brakes locked up when I slammed on them. I disconnected the battery and the light went off and the ABS functioned normally. The light just came on again.
I will check for ABS codes tomorrow.

-Do I have excess air in my brake system?
-Do I have excess air in my ABS system?
-Do I need a new master cylinder?
-I'm pretty sure that, since the ABS can be made to work properly with an electrical reset, the motor/accumulator/etc is fine.
-How does one go about cleaning a speed sensor? No one has touched the brakes since I purchased the car, and since the ABS was fine, I don't think anyone vucked a speed sensor up.
-Finally, since it's a wagon, it shares the front brakes with the Prelude Si/VTEC and Accord V6, right? What are the best OEM replacement pads/rotors I can buy? Akebono?

 

Hey, some of these questions can be answered...