So, what’s the problem exactly? During production, hydrogen might have been trapped in the brake lines, which compromises the hydraulic circuit. In simple terms, when you brake, pressure in the line makes the pedal feel soft, so you can’t brake as easily or effectively as you need to.
If you suspect your Honda Odyssey is affected and wasn’t fixed, head to a Honda service center where they can bleed the brake system. That should fix the problem!