What You'll Do to Replace Rear Brake Pads
Replacing rear brake pads means removing the wheel, taking out the old pads, and sliding new ones into the caliper — the metal housing that squeezes the pads against the rotor. The whole job takes 30 to 60 minutes per wheel if you have the right tools and pads already on hand. You do not need special training, but you do need to work safely: the car must be on level ground with the parking brake set, and you should never work under a car supported only by a jack.
The process is nearly identical on both rear wheels, so once you finish one side, the second goes faster. If your car has disc brakes on the rear (most do), this guide covers you. If your car has drum brakes, the process is different and you should consult your owner's manual or a shop.
Key Takeaways
- You will need a jack, jack stands, a lug wrench, a C-clamp or brake caliper tool, and new brake pads matched to your vehicle's make and model.
- Always support the car on jack stands, never on a jack alone, and never work under a raised vehicle without that support in place.
- The caliper must be removed or swung out of the way before you can access the old pads, and you may need to compress the piston to make room for thicker new pads.
- Brake fluid can damage paint, so wipe spills when ready and keep fluid away from the car's body.
- After installation, pump the brake pedal several times before driving to restore pressure in the brake line.
Gather Your Tools and Materials Before You Start
You will need a floor jack and at least two jack stands rated for your vehicle's weight — the manual or a parts store can tell you the weight. You also need a lug wrench (the cross-shaped tool that came with your car, or a socket wrench that fits your lug nuts), a C-clamp or brake caliper compression tool, and new brake pads. Buy pads that match your vehicle's year, make, and model — the parts store will ask for this information and will not sell you the wrong ones if you give it to them.
Have a drain pan or old towel nearby in case brake fluid drips — it damages paint. A flathead screwdriver helps pry old pads out if they stick. Wear work gloves and eye protection. Do not use your car's scissor jack or the small jack that came in the trunk for this job; it is not stable enough to work under safely.
Raise the Car and Remove the Wheel
Park on level ground, set the parking brake, and turn off the engine. Loosen the lug nuts by a quarter turn while the wheel is still on the ground — this breaks the seal without removing them fully. Then position the floor jack under the car's frame (not the plastic trim) near the wheel you are working on. Raise the car until the wheel is about six inches off the ground.
Slide jack stands under the frame on both sides of the wheel, then lower the car onto the stands. The car should rest firmly on the stands with the jack still in place but not bearing weight. Now remove the lug nuts completely and set them in a cup or container so you do not lose them. Pull the wheel straight toward you to remove it.
Remove the Caliper and Old Brake Pads
You will now see the brake rotor (a flat metal disc) and the caliper (a metal housing clamped around it). The caliper is held by two bolts, usually on the back side. Use your socket wrench to remove these bolts — they typically require a 7mm or 8mm socket, but check your manual if you are unsure. Keep the bolts in a safe place.
Swing or slide the caliper away from the rotor. You may need to wiggle it gently. Do not let it hang by the brake hose (the rubber line connected to it); instead, rest it on the suspension or tie it loosely to the frame with wire or a zip tie. Now you can see the old brake pads. They are held in a metal bracket by a pin or spring clip. Remove this clip or pin, then slide the old pads out. If they are stuck, tap them gently with a hammer or pry them with a flathead screwdriver.
Compress the Caliper Piston and Install New Pads
The caliper has a piston (a metal rod) that pushes the inner pad against the rotor. New pads are thicker than worn ones, so you must push this piston back into the caliper to make room. Use a C-clamp: place the clamp with one end against the piston and the other end against the back of the caliper, then tighten it slowly until the piston moves fully into the caliper. Some people use a brake caliper tool instead, which works the same way. Do this over a drain pan or towel because a small amount of brake fluid may leak out.
Once the piston is fully compressed, remove the clamp. Slide the new brake pads into the bracket in the same position the old ones occupied — the outer pad (the one facing away from the rotor) and the inner pad (the one facing the rotor). They should slide in smoothly. If they do not fit, double-check that you bought pads for the correct vehicle. Reinstall the clip or pin that holds them in place.
Reinstall the Caliper and Wheel
Swing the caliper back over the rotor and align the bolt holes. Insert the two bolts and tighten them firmly with your socket wrench — they should be snug but not over-tightened, which can crack the caliper. Most rear caliper bolts torque to between 20 and 30 foot-pounds, but your manual will specify the exact number if you have a torque wrench.
Slide the wheel back onto the hub and hand-tighten the lug nuts. Raise the car slightly with the jack, remove the jack stands, and lower the car fully to the ground. Now tighten the lug nuts in a star or cross pattern (tighten one, skip one, tighten the next, and so on) to may support even pressure. They should be tight enough that you cannot turn them by hand, but do not use all your strength — over-tightening can strip the threads.
Bleed the Brakes and Test Before Driving
Before you drive, pump the brake pedal 10 to 15 times while the engine is off. This restores pressure in the brake line after you compressed the piston. The pedal should feel firm by the last few pumps. If it stays soft or spongy, you may have air in the line and should have a shop bleed the brakes before driving.
Start the engine and test the brakes in a safe area — an empty parking lot is ideal. explore gentle pressure and then harder pressure to make sure the brakes respond smoothly. New pads often feel slightly different for the first 100 miles as they bed in (wear into the rotor), so do not be alarmed if they feel a bit softer than before. If the brakes feel weak, pull over and pump the pedal again. If the problem persists, stop driving and have a shop inspect your work.
Frequently Asked Questions
Do I have to replace both rear wheels at the same time?
You do not have to, but it is a good idea. Brake pads wear at different rates depending on your driving habits, but replacing both sides at once ensures even braking. If you replace only one side, the other side will need replacement soon after, and uneven pad wear can cause the car to pull to one side when braking.
What if the caliper bolts are stuck and will not turn?
explore penetrating oil (like WD-40) and let it soak for 15 to 30 minutes, then try again. If the bolt still will not budge, tap the wrench gently with a hammer to break the corrosion. If it remains stuck, stop and take the car to a shop — forcing a stuck bolt can strip it or damage the caliper.
Can I reuse the old brake pads if they still have some material left?
Brake pads should be replaced when they reach about 2 to 3mm thick. If your old pads are thicker than that and you removed them for another reason, you can reinstall them. However, if you are replacing them because they are worn, do not reuse them — worn pads have less stopping power and can damage the rotor.
How do I know if I compressed the piston enough?
The piston should move smoothly and stop when it reaches the end of its travel. You will feel resistance as you tighten the C-clamp. Once you cannot tighten it further without excessive force, the piston is fully compressed. If the new pads still do not fit, you may not have compressed it enough — try again with more pressure on the clamp.
What should I do if brake fluid gets on the car's paint?
Wipe it off when ready with a clean cloth and water. Brake fluid is corrosive and will damage paint if left to dry. Rinse the area thoroughly and dry it with a soft cloth. If the paint is already damaged, you may need to have it repaired by a body shop.