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Disc Brake Tutorial - Page 2

Brake System Mechanical Components

Now let’s look at the mechanical components. When you remove your tire and rim, known collectively as the ” wheel” , you are face to face with the mechanical portion of your brakes. Below are two diagrams, shown from slightly different points of view, with labels naming the individual components.


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brake repair atlanta ga
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disc brake caliper
disc brake replacement atlanta ga
We saw the brake caliper with its hydraulic pistons before in the hydraulic system. When the hydraulic pressure, created by depressing the brake pedal, moves the pistons towards the brake pads the pads are then forced against the rotors stopping it from turning.
The pad is made up of 2 major parts, the friction material and the metal backing plate that the friction material is bonded to. The view on the right shows the pads 50% worn away and the pistons slightly extended from the calipers to compensate for the worn away friction material.

As you use your brakes the friction material is worn away. This worn material is what dirties your wheels over time. It is important to replace the pads before they wear down to the metal backing plate. Otherwise, your brakes will go ” metal on metal” meaning the metal backing plate has begun to rub against the metal rotor. When this happens the rotor is destroyed rapidly.
Below is a diagram showing the pads wearing against the rotors.
warped disc brake rotor marietta
Go to Disc Brakes Tutorial - Pg 3
Professional Automotive Repair - Marietta/East Cobb
1770 Lower Roswell Rd.
Marietta, GA 30068
770 509 7900
M-F 8:00am - 6:00pm
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404875 Professional Automotive Repair - Atlanta/Midtown
2184 Monroe Dr.
Atlanta, GA 30324
​404 875 3900
M-F 8:00am - 6:00pm
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