Don't quote me on the numbers, but if I remember correctly the brake system pressure will be about 350 psi with leg pressure only and about 900 psi with the Hydrovac added to the system. If you've ever driven a modern car and had it stall and felt how hard it is to stop the vehicle, that's the same feeling you'd get if the Hydrovac stopped working...it takes WAY more leg pressure to stop the truck. I would consider our big trucks to be un-safe to drive (except in an emergency) without the Hydrovac working, a panic stop would not be fun!
Post a picture of the broken part...
Mike B
