Weird Hydroboost Issue

[Kraftwork69]

So I installed a hydroboost setup about two years ago and everything had been working great. Out of the blue however, when applying the brakes I can feel a slight "bump" or call it a feedback in the steering wheel when turning either direction. Its much more noticeable at slower speeds.

Setup is with the proper pressured Saginaw pump/res and boost return is going directly into the res. System started life with a filter on the gearbox return line, fluid is royal purple, and everything looks clean with no air in the system.

I've flushed twice and performed the boost and steering system bleeding procedure multiple times with no change.

It all works fine except for that slight bump/feedback in the wheel when steering and braking at the same time and wonder if anyone has experienced this.

Thanks.