![]() When you release the brake pedal, the springs return each piston to its initial point. Brake fluid moves through the brake lines, engaging the braking mechanism.This pressure drives the secondary piston to compress the brake fluid in its circuit.As the primary piston moves, hydraulic pressure builds inside the cylinder and brake lines.A pushrod drives the primary piston to compress the brake fluid in its circuit.Here’s what happens in the master cylinder when you press down on the brake pedal: ![]() It must be adequately filled with brake fluid to prevent air from entering the brake system. The master cylinder reservoir is located on top of the master cylinder. It controls the pressure distribution between the front and rear brake for balanced, reliable braking performance. There’s also a proportioning valve in most vehicles, connecting the master cylinder to the rest of the brake system. This way, if one brake circuit fails, the other circuit (that controls the other pair) can stop the vehicle.
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