Brake Disc Caliper problems of the 2009 Honda Odyssey

First time noticed soft brakes then pedal went down almost to the floor which ended up making girding noise. This now has occurred many times over especially going down hill of any grade low or high. I have complained to my local Honda dealer but no action but to say they have heard of others complaints but can't re-duplicate nor has fix for that. I went to the Honda forum and there were many complaints regards to these soft brakes and similar issues. In that forum many mechanically minds have concluded that Odyssey uses same small brakes/calipers as smaller SUV- cvr. Comparing that these are just too under powered brakes for our heavy minivan. Some have found easy solution by replacing them with Honda passport's brakes/rotors/calipers to satisfaction. I believe this is a big safety issue. They know about it on same model on yr 07 & 08. I have so far had to pay dealer for brake fluid bleed & flush(it was dirty and very dark) at 27k mi. , rotor resurface for both front and rear, brake pads replace at 42k mi. I'm also previous owner of 2001 Odyssey and though experienced auto tranny issue, never had brake problem nor many services related to brakes. Please investigate this model and hopefully we don't have to keep paying or worst have accident some where down the road because of this under powered brakes.