Started engine, backed out of parking space. ABS warning flashing as usual. (Always does for 15' per manual)
Was steep so had to really clamp front brake to stop since ABS wasn't on yet. As I stopped ABS kicked in so snapped to a stop.
Put in gear and took off, ABS light flashing, no brake boost, takes a great deal of force to get brakes to work.
Park for an hour, put in gear, take off, ABS light flashing but have brake boost.
Ride 30 miles, stop, restart, all OK then light comes on again.
As a test, turn off and restart engine. Everything normal.