I have tried pumping up the brakes before hitting the button. It doesn't make any difference.

Pedal stays where it is, it doesn't sink to the floor. Two years ago I replaced the master and booster when the booster failed.

I have no leaks, and reservoir is staying full.

The fronts tires are not sliding, they just roll.

It's been a problem I've been chasing since last year. But next week I am getting the front suspension replaced and it will be ready to drive in a spirited and aggressive manner again. Due to the current condition of the upper A arm bushings and ball joints, its only been out for the occasional Sunday drive.

I'm tempted to get a new roll control solenoid and have it swapped in while the front is torn apart. But wanted to see if anyone here might have had a similar problem and have some insight into the problem.

The only thing I can come up with is a fluid must be getting past the plunger while the solenoid is activated.