The master cylinder on a front/rear split system is being...

The master cylinder on a front/rear split system is being discussed. Technician A says a leak at the front brake will stop the primary piston from building pressure. Technician B says the load-sensing proportioning valve is mounted at the rear of all master cylinders. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B

The operation of a single piston, floating caliper disc brake is explained at (and the figure is taken from) http://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake.htm. A 10-inch diameter brake rotor is contacted by the two pads over areas which are 70° circular sectors with outside and inside radii of 4.8 and 2.4 inches respectively. The coefficient of friction between the pads and the rotor is 0.4. The single piston has a diameter of 2.25 inches. If the brake is installed on a front wheel (26.2-inch outside diameter) of a 4000-pound car and if we assume that each front brake delivers 40% of the total braking force and if the hydraulic pressure reaches 1500 psi during braking from 30 mph: a) What is the force acting between each pad and the rotor? b) What is the maximum pad pressure? c) What is the minimum pad pressure? d) What torque does the brake deliver? e) How far does the vehicle travel before coming to a stop?

Adi S.

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