Front brakes, hard brake jerk issue\concern

[Alex88]

Hi

New to the posting side of forum but visited it quite often to get some help
We got our self X5 E53 3.0d M57n, fun machine and love it.

I recently installed new seal kit on all calipers and new caliper pistons on front as well as new rotors and brake pads all around. Bleed the brakes with ISTA as well.

Now maybe it is a paranoia or something actually went south.
The concern is hard sudden braking.
When I hit the brakes hard I get a small jerk like effect from what it feels like front left wheel. No matter what speed I am going(5kph or 50kph).

After that initial quick jerk it brakes smooth not pulling car to either side.
It is like brake not engaging smoothly on that left wheel.
With usual brake use there is no jerk, smooth and stops great.


Anybody got any ideas at what I should check?
Could it be not break related?
I tried searching the forums but only items found is jerking and vibrations during braking and nothing like above.

Thanks in advance!