Question

4. A vehicle has front disc and rear drum brakes. Considering a brake test, the brake force at a rear wheel was found to be 1200 lbf. The rear tire was a P225/45R-18. a. Find the rear wheel radius. b. Find wheel torque that has to be provided by the drum brake. c. A modern drum brake system has both shoes self-energizing. Such a drum brake has dimensions $D = 9.5$ in, $a = 4.0$ in, $b = 2.0$ in, $\theta_1 = 25^\circ$, $\theta_2 = 145^\circ$, $\mu = 0.33$, $C = 7.75$ in. Find the activation force that has to be provided by the hydraulic brake system. d. Explain what happens to vehicle performance as the brake balance is shifted to cause rear wheel lockup.

          4. A vehicle has front disc and rear drum brakes. Considering a brake test, the brake force at
a rear wheel was found to be 1200 lbf. The rear tire was a P225/45R-18.
a. Find the rear wheel radius.
b. Find wheel torque that has to be provided by the drum brake.
c. A modern drum brake system has both shoes self-energizing. Such a drum brake
has dimensions $D = 9.5$ in, $a = 4.0$ in, $b = 2.0$ in, $\theta_1 = 25^\circ$, $\theta_2 = 145^\circ$, $\mu = 0.33$,
$C = 7.75$ in. Find the activation force that has to be provided by the hydraulic
brake system.
d. Explain what happens to vehicle performance as the brake balance is shifted to
cause rear wheel lockup.

4. A vehicle has front disc and rear drum brakes. Considering a brake test, the brake force at
a rear wheel was found to be 1200 lbf. The rear tire was a P225/45R-18.
a. Find the rear wheel radius.
b. Find wheel torque that has to be provided by the drum brake.
c. A modern drum brake system has both shoes self-energizing. Such a drum brake
has dimensions D = 9.5 in, a = 4.0 in, b = 2.0 in, θ1 = 25^∘, θ2 = 145^∘, μ = 0.33,
C = 7.75 in. Find the activation force that has to be provided by the hydraulic
brake system.
d. Explain what happens to vehicle performance as the brake balance is shifted to
cause rear wheel lockup.

Added by Veronica S.

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