Hi Edgar.

I understand you mean 350-03.

By "brakes with delay" you mean hydrostatic brake or braking with the middle pedal (not presumed for application while driving)?

If it's brake pedal - check the brake valve (under the floor near the front axle)
It it's hydrostatic braking - it may be caused by the leakages on servo, or problems with servo electrovalves.

Such conclusions from the first glance.

Regards