oscarrussell

Before the exam, it is better to feel a little hungry

I am new member too

It sounds like you're experiencing a combination of issues that might be affecting the confidence and predictability of your rear brake setup on your trials bike. The uneven pad wear and the gap at the leading edge versus the trailing edge could indeed be indicative of frame flex, especially considering the age of your mid-2000s ZOO Pitbull frame. Older frames can sometimes flex more under stress compared to newer, more rigid designs, which might contribute to the brake performance feeling less predictable.