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Where is the proportional valve in a car braking system?

The proportional valve is a part of the braking system in cars that help regulate the brake force distribution between the front and rear wheels. It is situated in the brake line that goes from the master cylinder to the rear brakes. The proportional valve is usually located under the car, near the rear axle, and is connected to a pressure sensor that measures the brake fluid pressure in the front and rear brake lines.