A passenger road car is fitted with disc brakes at the front and drum brakes at the rear. All the brakes are actuated by

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A Passenger Road Car Is Fitted With Disc Brakes At The Front And Drum Brakes At The Rear All The Brakes Are Actuated By 1 (173.32 KiB) Viewed 15 times

A passenger road car is fitted with disc brakes at the front and drum brakes at the rear. All the brakes are actuated by hydraulic pistons, where the fluid pressure is p. Given the dimensions of the brakes, the torque developed at a rear wheel has been calculated to be 391 py2 , where y is diameter y of the piston acting on the rear brake drums in mm. The torque developed at a front wheel has been calculated to be 62 px2, where x is the diameter of the piston acting on the front discs in mm. > If the rear brake piston diameter, y, is 20 mm, calculate the required front piston diameter, x, in mm, in order to achieve the desired braking force ratio of 70 % to 30 % between the front and rear brakes. Give your answer to 2 dp.