ABS/VDC warning lights when hard braking

[Maxhead]

OK, Another problem which started a while back.

When I depress the foot brake hard to the floor (stationary or moving) the ABS and VDC and SLIP lights come ON.

Have no idea where to start.

I have checked all brake lines, electrical wiring to the brake lights and only found that the brake fluid level is a little low(about a quater way between low and high mark)
Everything else seems OK visually

I have reset the ECU by disconecting the battery as well

Stumped!