How do pressure-sensitive proportioning valves affect the rear brakes? a. Increase brake pressure under light braking b. Increase brake pressure under heavy braking c. Decrease brake pressure under light braking d. Decrease brake pressure under heavy braking

The correct answer is c. Decrease brake pressure under light braking.<br /><br />Pressure-sensitive proportioning valves are designed to adjust the brake pressure between the front and rear brakes based on the braking force applied. Under light braking conditions, these valves decrease the brake pressure to the rear brakes, which helps prevent premature wear and ensures balanced braking performance.