. The floating calliper brake used in the front car wheel is shown in the following figures. The calliper
supports a single floating piston actuated by hydraulic pressure. Two annular pads, 𝑟𝑟𝑖𝑖 = 100 mm,
𝑟𝑟𝑜𝑜 = 140 mm, subtend an angle of 110°, have a coefficient of friction of 0.4, and are actuated by a
pair of hydraulic cylinders 40mm in diameter. The torque requirement is 1350 N.m. For uniform
wear
a) Find the largest normal pressure 𝑝𝑝𝑝𝑝.
b) Estimate the actuating force 𝐹𝐹.
c) Find the equivalent radius 𝑟𝑟𝑒𝑒 and force location 𝑟𝑟.
d) Estimate the required hydraulic pressure.
supports a single floating piston actuated by hydraulic pressure. Two annular pads, 𝑟𝑟𝑖𝑖 = 100 mm,
𝑟𝑟𝑜𝑜 = 140 mm, subtend an angle of 110°, have a coefficient of friction of 0.4, and are actuated by a
pair of hydraulic cylinders 40mm in diameter. The torque requirement is 1350 N.m. For uniform
wear
a) Find the largest normal pressure 𝑝𝑝𝑝𝑝.
b) Estimate the actuating force 𝐹𝐹.
c) Find the equivalent radius 𝑟𝑟𝑒𝑒 and force location 𝑟𝑟.
d) Estimate the required hydraulic pressure.
