Of all the systems in your car, perhaps the most important to your safety are the brakes. Modern vehicles use hydraulic fluid to transmit pressure from a master cylinder to individual cylinders at each wheel via fluid contained in the brake lines. On wheels with disc brakes, calipers squeeze brake pads inward onto the discs to slow the wheels, while on wheels with drum brakes, brake shoes exert outward force on the inner surface of the brake drum. Many
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