Hydraulic & Electric Brake Systems

Automotive brake systems are designed to slow and stop the wheels of a vehicle. There are essentially two different types of brake system, the conventional friction brake and the electric, or electromagnetic, brake.

  1. Hydraulic Brakes

    • The conventional friction brake system consists of a master cylinder and a wheel caliper, or cylinder, which are filled with brake fluid. When the brake pedal is applied, brake fluid is forced by hydraulic pressure through the caliper to the brake shoes or pads.

    Electromagnetic Brakes

    • Electromagnetic brakes, or retarders, typically consist of coils of aluminum wire mounted in epoxy resin on the chassis of a vehicle and metal discs that rotate between the coils. When electric current flows through the coils, the rotation of the discs is impeded and braking force is created.

    Electromagnetism Vs. Friction

    • The current flowing through the coils of electromagnetic brakes is governed by an adjustable resistor, known as a rheostat, and the braking force is directly proportional to the current. As such, electromagnetic brakes do not use friction and operate at lower temperatures than conventional friction brakes.

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