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A Guide To Brake Calipers

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Car maintenance for most people can be divided into two categories: the parts you understand, and the parts you don’t.

As a driver, changing the motor oil, replacing tires, and fixing the brakes when they squeak is pretty commonplace. We understand the process, know the warning signs, and fit those duties into our routines. 

But what about digging deeper? What about maintaining your car’s brake calipers. 

What are brake calipers?

Glad you asked. 

What is a brake caliper?

The brake caliper is the part of a vehicle that pushes the brake pad to the brake rotor to effectively bring your car to a halt. It’s hydraulic, which uses fluid pressure to cause movement. 

Brake calipers resemble a clamp, and partially frame the brake rotor. The caliper houses the car’s brake pads and pistons, creating friction as it slows the vehicle down. They are the heart of the braking system in vehicles that use disc brakes. 

Overall, brake calipers have two functions:

1. They guide the brake pads. Brake calipers aren’t an on/off component. Instead, they’re used to guide your vehicle along based on traffic conditions. A little pressure slows you down. More pressure brings you to a stop. Brake calipers have a design feature that ensures the brake pads are always efficient and reliable for the overall braking process. 

2. They convert brake fluid into mechanical movement. This process uses hydraulic brake fluid for the braking action within your vehicle. Without the brake caliper, this process wouldn’t take place as effectively as it does, keeping you safe in the process.  

A Guide To Brake Calipers

How do brake calipers operate?

To understand how a brake caliper operates, you need to step back and look at the entire braking system. 

When you apply the brakes, a piston is pushed into motion, putting pressure on the brake fluid in the master cylinder. The brake fluid moves through hoses in the brake lines, from the master cylinder to the brake caliper. 

This fluid pressure creates movement in the caliper pistons, resulting in the brake pads pushing forward to make contact with the rotor. Different vehicles use different types of calipers, which each have varying amounts of pistons. This squeezing action causes friction against the moving rotor, causing it to slow. More pressure means more slowing action, reducing the speed or bringing it to a halt altogether. 

When you release pressure on the brake pedal, the situation reverses. Hydraulic fluid returns to the master cylinder, and the brake caliper pistons return to their resting position. It sits in waiting for the action to arise again. 

As you step on the brake pedal, fluid pressure is released to all four wheels simultaneously, in the same quantity. This results in balanced braking, and ensures your vehicle’s safety. 

What are the two types of brake calipers?

Brake calipers come in two categories: floating and fixed. They differ in design, mourning, and operation. 

Floating calipers are compact and lightweight. They lack power when compared to a fixed caliper. Instead of being mounted rigidly to the rotor, they slide freely on lubricated pins and bushings. Hydraulics moves the piston and squeezes the inboard brake pads against the brake disc when you step on the brake pedal. That gives the caliper free movement to move along the rotor on the backside, creating clamping action as necessary for control and movement. 

Fixed calipers have multiple pistons that make them more powerful than floating. They are more suitable when a lot of power is needed – racing cars or heavy vehicles that require a lot of stopping power. They have more braking force distribution, and produce a firmer, more powerful grip of the rotor as you press down on the pedal. 

Both have advantages and disadvantages. Floating calipers are the most commonly used by manufacturers today. Check with your owner’s manual to determine which is used in your vehicle. 

The signs your calipers need replacing

Whale brake pads will need replacing over the lifetime of a vehicle, brake calipers are designed to last the life of the car. That isn’t always the case. If they are damaged in any way, you’ll start to notice the way your car drives. 

Vehicle pulls to one side when driving or braking

If your car seems to pull to one side while driving, the caliper may be the problem. The pistons move in and out from the hydraulic pressure from the master cylinder. If there is debris or corrosion, it can cause these pistons to freeze up. This will result in the brake pad being unable to connect properly with the rotor. The car will pull towards the side of the damaged caliper when the pistons fail, or away from the damaged side if the brake pad fails to connect with the rotor. This can happen while driving or during braking. 

Squealing or rubbing noises

When parts don’t operate the way they should, they can create noise from the areas impacted. While brake pad damage makes a distinct noise every time you apply the brakes, calipers will produce noise whether the brakes are applied or not. When you notice a high-pitched squealing or a metallic rubbing noise while driving and it doesn’t go away, bring your vehicle in as soon as possible, as this can lead to complete brake failure. 

Uneven brake pad damage

Brake pads are designed to last 30,000 to 70,000 miles. Because brakes are precise in function, both sides of the car should wear down at approximately the same time. If one brake pad is distinctly different than the other when you replace them, it could be a sign there is something wrong with the brake caliper. 

Brake fluid leak

Anytime you notice brake fluid leaks around the car, it’s a sign of damage. Brake fluid is a light yellow color that may darken as it ages. If you touch it, it has an oily, slippery feel. If a caliper leaks, it may cause a slight oily spot on the ground inside the tire. Different things could cause this, so it’s important to inspect them as soon as possible. 

This Is How You Tell If Your Brake Calipers Need Replacement or Repair

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The braking system is one of the most important systems on your vehicle. While you might be familiar with brake pads and brake fluid, brake calipers are a little more obscure. What are they? What do they do? And how do you maintain them throughout the life of your car? 

What are brake calipers?

Owning a car means performing regular maintenance. For your braking system, the most often parts to be replaced include the brake pads. 

Manufacturers recommend replacing brake pads every 10,000 to 20,000 miles. When it comes to the brake rotors, you have a bit longer. Rotors should be replaced every 60,000 to 70,000 miles to ensure your braking system remains in great shape. While not as common as motor oil, your brake fluid should still be replaced every four to five years. If you haven’t read through your owner’s manual, it’s a good thing to keep on hand. 

Brake calipers also need replacing over time. Through wear and tear, they lose their ability to clamp down and relax the brake pads as you apply and release pressure. 

A brake caliper is a part of the disc brake system, which is what most vehicles have on their front brakes. You can see it sitting on your wheel if you look through the spokes. The brake caliper houses the brake pads and pistons. Its sole job is to slow the car’s wheels as you press down on the brake pedal, to create friction against the brake rotors. 

Inside the caliper, a powerful piston uses pressure from hydraulic fluid to press the brake pads against the brake rotor. When working properly, the calipers move effortlessly based on the amount of pressure from the brake pedal. 

This Is How You Tell If Your Brake Calipers Need Replacement or Repair

When something in the system breaks, wears down, or stops altogether, that’s when you have a problem. 

Brake caliper alerts – how to know when you have a problem

Like other systems on your vehicle, the braking system has all kinds of warning signals to alert you when things aren’t working correctly. 

Most vehicles have sensors to art you to braking problems. The brake light on your dashboard will illuminate when the sensors detect something is wrong within the system. 

The brake light could trigger if you’re low on brake fluid, or the pressure isn’t within set guidelines. It can also alert you to brake pads wearing down if the car is equipped with pad sensors. The dashboard light is designed to give you plenty of time to set up a service visit and fix the problem before it escalates. 

Unfortunately, problems with the brake calipers can be a little more challenging to detect. 

Where’s the brake caliper problem?

There are several ways you can identify and prevent further brake caliper breakdown. 

Noises, smells, and feelings

Driving is often one of those mindless tasks you perform on autopilot. But it is a good idea to stay alert and pay attention to what your car is trying to tell you. The first problem with any system is often identified through one of your senses. 

Does your car drive differently? A malfunctioning caliper can cause your vehicle to pull to one side as you drive. This is due to an unbalanced braking system. Because one caliper doesn’t provide pressure in the same manner as the other side, you’ll notice your car lurching forward, or pulling to one side as you slow and stop. 

You may also hear a squealing or grinding sound. This happens when brake pads run thin, and can’t connect with the rotors efficiently. Is it the brake pad, or is it a caliper malfunctioning that caused it to wear down before its time? If you’re nearing the lifespan of your brake pads, it may be the problem. But if you still have life left on them, it may be worth further investigation. 

Too much pressure on the braking system can also ramp up the heat within the system. If you notice a burning chemical smell near one of the front wheels, it may be a sign of overheating from the brake pads and the bonding agent. 

Do a visual inspection

If you’ve ever boarded a plane early, and watched outside the window, chances are you’ve seen the pilot walk around doing a visual inspection. Why? He’s in charge of the plane, keeping the passengers safe, and the plane in good working condition. It’s up to him to decide if it’s okay to fly, and if he’s comfortable with the mechanics and technology he’s been given. 

Driving works similarly, though most of us rarely take a walk around our vehicles before jumping in behind the wheel each time we drive. But there is something to learn from a pilot – it’s a good idea to do a visual check from time to time. Do you notice tire tread wearing unevenly? Is there liquid accumulating near the caliper or the wheel? Keep an eye on anything that looks suspicious, and bring it in for inspection at your earliest convenience. 

Proper maintenance means prevention

Luckily, it won’t take much time out of your day to ensure your vehicle is working well. With an occasional visual inspection, and a moment or two paying attention to what your car is trying to tell you, you’ll be able to drive securely with the knowledge that everything is working well. 

Bring in your car for regular motor oil changes. Ensure your tires are properly inflated, and your wheels are properly balanced. 

Let a mechanic run through a checklist to ensure everything is working well. You can schedule this at the start of each season. Or if you’re heading out on the open road. It’s a great way to keep your security in check to ensure something bigger doesn’t happen. 

Braking problems? It might be caliper issues

Your brake calipers are designed to last 100,000 miles or more. They aren’t a component that needs to be replaced often. 

Being aware of potential signs of a problem will ensure your braking system continues to work well. It’s the best way to keep your passengers safe, and your vehicle operating well. 

When was the last time you had your braking system inspected?  

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