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The
brake system is actually composed of two kinds of systems---Hydraulics
and Friction Materials. Here's what happens within these systems between
the time your foot hits the brake pedal and your car stops.
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Hydraulics |
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Master
Cylinder
When pressure is applied to the brake pedal, the master cylinder
creates hydraulic pressure which pushes brake fluid to the wheel
brakes. |
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Brake
Lines and Hoses
Steel brake lines and high pressure rubber hoses are the avenues
through which the pressurized brake fluid travels. |
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Wheel
Cylinders and Calipers
These are the hydraulic cylinders that apply pressure to the
friction materials, causing your car to stop. |
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Friction Materials |
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Disc
Brake Pads and Drum Brake Shoes
These brake linings are composed of high temperature materials
that create the friction that stops your car. |
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Types of Brakes
Disc Brakes
Disc brakes consist of a Disc Brake Rotor, which is attached to
the wheel, and a Caliper, which holds the Disc Brake Pads.
Hydraulic pressure from the Master Cylinder causes the Caliper
Piston to clamp the Disc Brake Rotor between the Disc Brake
Pads. This creates friction between the pads and rotor, causing
your car to slow down or stop.
Drum Brakes
Drum brakes consist of a Brake Drum attached to the wheel, a
Wheel Cylinder, Brake Shoes and Brake Return Springs. Hydraulic
pressure from the Master Cylinder causes the Wheel Cylinder to
press the Brake Shoes against the Brake Drum. This creates
friction between the shoes and drum to slow or stop your car.
Parking
Brake
The Parking Brake uses Cables to mechanically apply the brakes
(usually the rear brake.) This is used to prevent the car from
rolling when not being driven. |
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Anti-Lock Brakes: A System Built For Safety
Computer-controlled anti-lock braking systems (ABS) are a
recently developed safety feature. When sudden stops are made,
the ABS prevents wheel lock-up. The system is comprised of
wheel-speed sensors that monitor wheel rotation,
computer-controlled hydraulics that pulse the brakes on and off
rapidly, and the on-board computer. |
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