How Do Car Brakes Work?

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When a car's brake pedals are pushed, a rod comes into the master cylinder and forces brake fluid through the brake line and into the calipers. Find out how calipers push pistons and cause brake pads to smash together with help from an auto mechanic in this free video on car repair and diagnostics.

Part of the Video Series: Auto Repair & Diagnostics
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Video Transcript

Good afternoon my name is Tom Brintzenhofe certified master mechanic out of Reading, PA. Today I'm going to explain how a car brakes work. It's actually a real simple process; I simplify as easy as I can. When you push on that brake pedal there's a rod about yea long that comes through the firewall into the master cylinder here; which is where all your fluid your brake fluid is held. As that pushes forward with the help from the brake booster back there, that force comes forward, pushes the break fluid from here down through your line going to the back, going to the front, down through here, and it goes in to what they call a brake caliper. And as this caliper fills up with fluid as you're depressing the pedal it pushes this piston out. When this piston comes out it also will slide this caliper this way and take them brake pads and smash em together as tight as they possibly can against this rotor. Depending on how much force you put on that brake pedal. The same amount of force is put out here on these brake pads up against this rotor and that's the basic simple way of how brakes work.

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