What you need to do before you start
Changing brake pads and rotors is a job you can do at home with basic tools and a few hours of time. You will need a jack, jack stands, a lug wrench, a socket set, a brake fluid container, new brake pads, and new rotors — all available at any auto parts store. The process is the same whether you have disc brakes (the most common type) or drum brakes, though drum brakes require a slightly different approach that we cover separately below.
Before you begin, park on a level surface and engage the parking brake. You will be working on one wheel at a time, starting with either the front or rear — front brakes wear faster, so many people replace those first. Do not drive the car until you have finished all four wheels and tested the brakes in a safe area.
One safety note: brake fluid is toxic and can damage paint. Keep a rag nearby and wipe up spills when ready. If you are uncomfortable working under a raised vehicle, or if your car has electronic brake systems that require a computer scan after replacement, take it to a shop instead — this is not a job worth rushing.
Key Takeaways
- You will need a jack, jack stands, a socket set, new brake pads, and new rotors before you start, and the entire job takes two to four hours for all four wheels.
- Raise the car on jack stands (never on a jack alone), remove the wheel, and unbolt the brake caliper to access the old pads and rotor.
- Slide the new rotor onto the hub, reinstall the caliper with new pads, and pump the brake pedal several times before driving to restore pressure.
- Test your brakes in a safe area at low speed before returning to normal driving, and expect a slight grinding sound for the first few stops as new pads bed in.
Raising the car safely and removing the wheel
Loosen the lug nuts on the wheel you are working on while the car is still on the ground — they are much harder to turn once the wheel is in the air. Loosen them a quarter turn only, do not remove them yet. Then position the jack under the frame (not the plastic trim) near the wheel you want to work on, and raise the car until the wheel is about six inches off the ground.
Place jack stands under the frame on both sides of the wheel, lower the car onto the stands, and remove the jack. Now remove the lug nuts completely and set them in a cup or container where you will not lose them. Pull the wheel straight toward you to remove it from the hub.
Removing the old brake pads and rotor
You will now see the brake caliper — a metal housing that holds the brake pads. The caliper is bolted to the steering knuckle (the part that holds the wheel hub). Using your socket set, remove the two bolts that hold the caliper in place. These bolts are usually 17mm or 18mm. Once the bolts are out, slide the caliper away from the rotor and hang it from the suspension with a wire or bungee cord — do not let it hang by the brake hose, as this can damage the hose.
You will see the old brake pads sitting on either side of the rotor. Remove them by hand or with a flathead screwdriver. The rotor itself is held on by the wheel hub and may be stuck due to rust. Tap it gently with a hammer to loosen it, then slide it off. If it will not budge, spray penetrating oil around the center and wait ten minutes before trying again.
Installing the new rotor and brake pads
Slide the new rotor onto the hub. It should fit snugly but not require force. If it does not slide on easily, check that you have the correct rotor for your vehicle — rotors are specific to each make and model. Once the rotor is seated, you can move on to the pads.
Before you install new pads, you need to push the caliper piston back into its bore. This creates space for the thicker new pads. Use a C-clamp or old brake pad as a lever to push the piston back slowly — do not force it. As you do this, brake fluid will be pushed back into the master cylinder. If the fluid level is already high, you may need to remove a small amount with a turkey baster to prevent overflow.
Slide the new brake pads into the caliper, making sure they sit flat against the rotor. Some pads come with a metal shim on the back — this is normal and should stay attached. Reinstall the caliper bolts and tighten them to the torque specification in your owner's manual, usually between 20 and 40 foot-pounds.
Reinstalling the wheel and testing the brakes
Slide the wheel back onto the hub and hand-tighten the lug nuts. Raise the car with the jack, remove the jack stands, and lower the car to the ground. Now tighten the lug nuts in a star pattern — if you imagine the lug nuts as the points of a star, tighten them in that order rather than going around in a circle. This ensures even pressure. Tighten them firmly, but do not use all your strength; over-tightening can strip the studs.
Repeat this entire process for the remaining wheels. Once all four wheels are done, sit in the driver's seat and pump the brake pedal ten to fifteen times. The pedal will feel soft at first as air enters the system. Keep pumping until it feels firm and does not go all the way to the floor. This is critical — do not skip this step.
What to expect after you finish
Drive slowly in a safe area — an empty parking lot is ideal — and test the brakes gently. New brake pads need to be "bedded in," which means they need several heat cycles to reach full stopping power. For the first 200 to 300 miles, avoid hard braking and do not tow anything. You may hear a slight grinding or squealing sound during the first few stops; this is normal and will fade as the pads bed in.
If the brakes feel spongy or the pedal goes to the floor even after pumping, you may have air in the brake lines. This requires bleeding the brakes, which is a separate procedure covered in your owner's manual or by a shop. If the brakes feel normal but the warning light on your dashboard stays on, check that the brake fluid level is topped up — low fluid triggers the light.
Replacing drum brakes instead of disc brakes
If your car has drum brakes on the rear wheels, the process is similar but the parts are different. After removing the wheel, you will see a drum instead of a rotor. Remove the bolts holding the drum and slide it off. Inside, you will see curved brake shoes instead of pads. These are held in place by springs and a wheel cylinder.
Replacing drum brakes requires more disassembly and is more complex than disc brakes. If you are not comfortable with the extra steps, or if the springs are rusted and difficult to remove, this is a good time to take the car to a shop. Many people handle disc brakes themselves but leave drum brakes to a professional.
Frequently Asked Questions
How do I know if my brakes need replacing?
Most brake pads have a wear indicator — a small metal tab that touches the rotor when pads are thin. When pads wear down, this tab makes a squealing sound. If you hear squealing that stops when you press the brake pedal, your pads are due. You can also look through the wheel spokes at the rotor; if the pads look thinner than a quarter-inch, replace them soon.
Do I have to replace the rotor, or can I just replace the pads?
You can replace pads alone if the rotor is smooth and not cracked or deeply scored. However, if the rotor is warped (causing pulsing when you brake), cracked, or has deep grooves, new pads will wear out quickly on a damaged rotor. Most shops recommend replacing both at the same time for best results and longer pad life.
What if I accidentally drove on the brakes while they were apart?
Stop when ready and do not drive further. If the caliper is not bolted back on, the brake line can rupture and you will lose all braking power. If you have already reassembled everything, pump the brake pedal and test in a safe area before driving normally. If the pedal feels wrong, have a shop inspect the system before you drive on the road.
Can I replace just the front brakes or just the rear?
Technically yes, but it is not recommended. Brakes work as a system, and uneven braking power between front and rear can cause the car to pull to one side or lock up during hard stops. Most manufacturers suggest replacing all four wheels' brakes at the same time, or at least both wheels on the same axle (both fronts or both rears) together.
How long do new brake pads last?
This depends on your driving habits and the type of pads you buy. Organic pads typically last 25,000 to 70,000 miles. Ceramic pads last longer, often 40,000 to 80,000 miles. Aggressive driving, frequent braking, and towing reduce pad life. Check your pads every 15,000 miles or once a year to catch wear early.