What you're actually doing when you replace a caliper

A brake caliper is the part that squeezes the brake pads against your rotor to stop the wheel. When you replace one, you're removing the old caliper assembly and bolting a new one in its place. The job takes two to four hours per wheel if you've never done it, and you'll need basic tools: a socket set, a wrench, a C-clamp or brake caliper tool, and jack stands.

You don't need to replace both calipers at once unless both are leaking or stuck. Many people replace just the one that's failed. However, some mechanics recommend replacing them in pairs (both fronts or both rears) because they wear at similar rates. This is a choice you can make based on your budget and the condition of the other caliper.

This is a job you can do at home if you have a safe place to work and are comfortable working under a raised vehicle. If you're not confident with jack stands or don't have a level surface to work on, a shop is the safer choice.

Key Takeaways

  • You'll need a jack, jack stands, basic hand tools, and a new caliper matched to your vehicle's year, make, and model.
  • The caliper bolts to the steering knuckle or suspension bracket with two bolts; removing them and the brake line is the core of the job.
  • Brake fluid will spill when you disconnect the line, so have a container ready and be prepared to bleed the brakes afterward.
  • If you're uncomfortable raising the vehicle safely or working with brake lines, a shop can do this job for $150 to $400 per caliper including parts.

Getting the right replacement caliper

Before you start, you need the correct caliper for your vehicle. Calipers are not interchangeable across models. Go to an auto parts store with your vehicle's year, make, model, and engine size, or order online using your vehicle identification number (VIN). The parts counter will give you the caliper for the specific wheel—front calipers and rear calipers are different, and left and right can differ too.

You have two choices: an original equipment manufacturer (OEM) caliper, which is what the vehicle came with, or an aftermarket caliper from a brand like Raybestos, Akebono, or Centric. OEM parts cost more but are may provide to fit. Aftermarket parts are cheaper and usually fit well, but occasionally require minor adjustment. For your first time, OEM is the safer bet.

Check whether the caliper comes with new brake pads. Some do, some don't. If you're replacing the caliper because the pads are worn, you'll need pads anyway—buy them at the same time.

Preparing the vehicle and removing the old caliper

Raise the vehicle on a level surface using a jack, then find it with jack stands under the frame or suspension points. Never work under a vehicle supported only by a jack. Remove the wheel by loosening the lug nuts while the wheel is on the ground, then finish removing them once the vehicle is raised.

Locate the brake caliper behind the wheel. You'll see two bolts holding it to the steering knuckle or bracket. Before you remove anything, place a container under the brake line connection to catch fluid. Loosen the brake line fitting (usually a banjo bolt or a threaded line) with a wrench. You don't need to remove it completely yet—just loosen it enough to break it free, then tighten it back up temporarily so fluid doesn't pour out.

Remove the two caliper mounting bolts using a socket wrench. The caliper will come free. Now disconnect the brake line fully and let any remaining fluid drain into your container. Plug the line with a clean rag or a brake line cap to keep dirt out.

Installing the new caliper

Before you bolt the new caliper on, check the brake pads. If the new caliper came with pads already installed, you're ready to go. If not, install new pads into the caliper now, following the instructions that came with them. The pads slide into a bracket inside the caliper.

Position the new caliper over the rotor and align the mounting holes. Insert the two mounting bolts and tighten them to the torque specification for your vehicle—this is usually 25 to 40 foot-pounds, but check your vehicle's manual or the caliper box. Don't guess at this; bolts that are too loose can rattle or fail, and bolts that are too tight can crack the caliper.

Reconnect the brake line to the new caliper using the same fitting that was on the old one. Tighten it by hand first, then use a wrench to snug it down. Don't over-tighten—you can crack the fitting.

Bleeding the brakes after installation

When you opened the brake line, air entered the system. Air in the brake lines makes the pedal feel spongy and reduces stopping power. You need to remove this air by bleeding the brakes. This is the step most people find intimidating, but it's straightforward if you follow the steps.

You'll need a helper, a clear plastic tube, a container, and fresh brake fluid that matches your vehicle's specification (check the cap on your brake fluid reservoir). Start the engine and have your helper press the brake pedal slowly while you open the bleeder valve on the caliper you just installed using a wrench. Brake fluid and air bubbles will flow out through the tube into the container. When the fluid runs clear with no bubbles, close the valve and have your helper release the pedal. Repeat this five to ten times until no more air comes out.

Check your brake fluid level in the reservoir under the hood and top it off if needed. Pump the brake pedal several times to build pressure, then take the vehicle for a short test drive in a safe area. The pedal should feel firm, not spongy. If it still feels soft, you may have missed air in the line—repeat the bleeding process.

Common problems and how to avoid them

The most common mistake is not bleeding the brakes completely, which leaves you with a soft pedal. The second is over-tightening the brake line fitting, which can crack it and cause a leak. Tighten fittings firmly but not with all your strength.

If the caliper mounting bolts are too loose, the caliper can rattle or shift, causing uneven pad wear and noise. If they're too tight, you can crack the caliper body. Use a torque wrench if you have one; if not, tighten until snug and then add a quarter turn.

If you spill brake fluid on painted surfaces, wash it off when ready—brake fluid eats paint. If you get it on your skin, wash with soap and water. Brake fluid is toxic if swallowed, so keep it away from children and pets and dispose of old fluid at an auto parts store or hazardous waste facility, not down the drain.

When to take it to a shop instead

If you don't have a safe place to raise the vehicle, don't have jack stands, or aren't comfortable working under a raised car, a shop is the right choice. A professional can do this job in under an hour and will handle the bleeding for you. Expect to pay $150 to $400 per caliper depending on the vehicle and whether you provide the part or they do.

You should also take it to a shop if the caliper bolts are stuck or corroded and won't budge, or if the brake line is damaged or won't disconnect cleanly. Forcing these can cause more damage. A shop has penetrating oil, heat, and experience with stuck fasteners.

Frequently Asked Questions

Do I have to replace both calipers at the same time?

No. You only need to replace the caliper that's leaking, stuck, or damaged. However, if both calipers are old and one has failed, the other may fail soon. Some people replace them in pairs to avoid a second job in a few months. It's your choice based on budget and the age of the vehicle.

What if I don't have a torque wrench?

A torque wrench is helpful but not required for a first-time job. Tighten the mounting bolts until they're snug, then add a quarter turn more. They should be tight enough that you can't move them by hand, but not so tight that you're straining. If you plan to do brake work regularly, a torque wrench costs $20 to $40 and is worth having.

Can I drive the vehicle right after replacing the caliper?

Not until you've bled the brakes and tested the pedal. A spongy pedal means the brakes won't work properly. Pump the pedal several times to build pressure, then test in a safe area at low speed before driving normally. If the pedal still feels soft, bleed again.

What should I do with the old caliper?

You can return it to the auto parts store where you bought the new one—many offer a core exchange, which means you get a small refund ($10 to $25) for turning in the old part. If you don't return it, dispose of it as scrap metal at a recycling facility.