So I upgraded the brakes on my 2008 Rabbit. Purchased the 312mm OEM plain vented rotors BBK on ECS that came with the caliper carriers. Bought Hawk HPS pads for the front as well.
I've got 39k miles on my Rabbit currently. Rear brakes/rotors were replaced at about 20k miles with stock rotors and Hawk HPS pads. (I don't think these are the issue).
Braking under normal conditions seems fine. I've also recently had an alignment.
During the bedding process, I noticed that after the 5th or 6th braking cycle, the car started pulling hard to the right. I went for about a 10 mile highway drive to cool the brakes, and finished the bedding process. Again, by the 5th cycle it started pulling hard to the right again.
I'm not sure if I'm due for a brake bleed. I get conflicting info whether it is every 2 or 3 years. It's been two years since the last time they've been bled.
If this only happens after the brakes are warmed up, I think that the problem may be air or contamination of the brake fluid. Brake fluid should be changed every two years at a minimum, and all four brakes should be bled every time you change the brake pads or rotors.