The pressure differential valve is used to turn on the brake warning light and shut off the part of the hydraulic system that has a leak.

Question

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The pressure differential valve, also known as a brake proportioning valve, detects differences in pressure between two sides of the brake system. If there's a significant difference, indicating a leak or failure in one part, it activates the brake warning light and can isolate the faulty part to maintain braking capability in the rest of the system.

The Pressure Differential Valve Is Used to Turn on the Brake