Your brakes do a lot more than just stop your vehicle. Here's what's happening behind the scenes every time you hit the pedal.
Your brakes have a hefty job to do when it comes to your safety. Every stoplight, every turn, every time traffic suddenly slows down, your brakes are there to help you avoid a potentially dangerous situation.
While we often think about when we need to brake, we take for granted the complex mechanical system and all the components needed to get you to that stopping point. Brake pads, rotors, calipers, fluid, and several other parts work together to allow your vehicle to stop, even in a matter of seconds.
Understanding how your brakes work can make it easier to spot early signs of wear and help protect your vehicle’s safety on the road.
Brake Pads vs. Brake Shoes
Brake pads and brake shoes create the friction needed to slow down and stop your vehicle. While they operate in different setups—disc brakes versus drum brakes—they serve the exact same crucial function.
- Brake Pads: Used in disc brake systems. Positioned inside a caliper, they clamp down onto the outside surfaces of a spinning metal rotor to slow wheel rotation.
- Brake Shoes: Used in drum brake systems. Positioned inside a hollow metal drum, they expand outward against the drum’s interior wall to create stopping friction.
While disc brake systems are more common in modern vehicles, many trucks and older vehicles still utilize drum brakes. Over time, brake pads and shoes naturally wear down from the friction they create, eventually requiring replacement as part of your routine brake maintenance.
Rotors & Drums
Pads and shoes create the friction; rotors and drums are the metal components that provide the surface they press against.
- Brake Disc (Rotor): A flat, heavy metal disc attached to the wheel hub. When the brake pads clamp against the rotor, friction slows the rotation of the wheel. Because rotors are exposed to the air, they can dissipate heat effectively during braking.
- Brake Drum: A bowl-shaped metal housing that encloses the internal brake shoes. When the brakes are applied, the shoes expand outward against the inside of the drum, creating the friction needed to slow the vehicle.
While rotors and drums work differently, they both turn the vehicle's motion into heat through friction, giving the pads and shoes the surface they need to do their job.
Master Cylinder & Hydraulic Lines
In order for your brakes to work properly, they rely on hydraulic pressure to get brake fluid to each wheel. When you press the brake pedal, the master cylinder acts like a pump, pressurizing the brake fluid and pushing it through the hydraulic system.
Issues with the brake fluid, a leak in the system, or air in the hydraulic lines can affect how your brake pedal feels and how well your brakes work.
If you notice a soft or spongy brake pedal, the system should be inspected. It could be a sign that something in the hydraulic system isn't working as it should.
Brake Calipers
So, what actually pushes the pads and shoes into place?
The brake calipers and wheel cylinders are responsible for applying the force that presses the brake pads or shoes against their respective friction surfaces to create the friction needed to stop your vehicle.
In a disc brake system, the caliper sits around the rotor and uses hydraulic pressure to push the brake pads against it. In a drum brake system, the wheel cylinder uses hydraulic pressure to push the brake shoes outward against the inside of the drum.
Help Put the Brakes on Breast Cancer!
Think it may be time for new brake pads or shoes during your routine maintenance appointment? There's no better time than October!
This October, Precision Tire and Auto Center – AZ is partnering once again with the Cleveland Clinic through the Brakes for Breasts initiative.
During October, qualifying brake services include free brake pads, while customers pay for labor and any additional parts needed for the repair. We'll also donate 10% of the brake service to the Cleveland Clinic Breast Cancer Vaccine Research Fund.
So while you're taking care of the components that keep you stopping safely, you can also help us put the brakes on breast cancer.
