If you have the dual puck brakes on your Bravo, you may want to check your brake linings. I have been chasing similar issue on my Bravo last year. One side would just be soft and I had to pump the brakes couple of times to get good braking action. Inspection did not show any leaks. Bled the brakes 3 times to no avail. Always tested good in the hangar while bleeding, but then got soft again on taxi. Then I noticed that my brake linings were a bit thin on the affected side and the caliper had to travel to the point that it would push against the middle gear door (there is very little celarance there). The door would flex enough to allow the brake to bite, but then the pressure would push the caliper back in, hence the need to give it couple of pumps for the brakes to be firm.
Replaced the linings and the caliper is now not touching the door when brakes are applied. All is good now. Because you need to remove the middle doors to get to the brake caliper, I did not spot the problem until I had someone apply the brakes while I was watching the caliper movement without removing the middle doors.