When trying to bleed a vehicle with heigh sensing proportioning valve, the technician notices there is no pressure/fluid coming out of the rear brakes. What should the technician do next? A. Raise all four wheels and purge brakes
B. Adjust lever arm and purge
C. Purge proportioning valve first

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)