Replacing brake pads yourself is much cheaper than going to a workshop. All you need is some material input and steps below, and you can replace brake pads yourself
Brake pad display
Buy right brake pads. Brake pads can be purchased at any auto parts store or car dealership. Just tell them how old your car is, make and model. It is necessary to choose a brake pad at an appropriate price, but as a general rule, more expensive brake pad, longer life. There are some very expensive brake pads with a higher metal content than expected and they may be designed for racing wheels for road racing. You probably don't want to buy these brake pads because wheels with them are more prone to wear. Also, some people find brand name brake pads to be less noisy than cheaper ones.
Make sure your car is cool. If you've driven a car recently, your brake pads, calipers, and wheels are probably hot. Make sure they are cold before moving on to next step.
Loosen wheel nuts. Use wrench included with jack to loosen approximately 2/3 of nuts on tire. Do not spin all tires at once. Under normal conditions, at least two front brake pads or two rear brake pads are replaced, depending on vehicle itself and smoothness of brakes. So you can start with front or rear wheel.
Jack car carefully until there is enough room for wheels to move. Read instructions to determine correct position of jack. Put some bricks around other wheels to keep car from moving back and forth. Place jacks or blocks next to frame. Never rely entirely on jack. Repeat on other side to make sure both sides are secure.
Remove wheel. With car jacked up, loosen car nut and remove it, and at same time pull wheel out and remove it. If tire rim is made of an alloy or has steel studs, the steel studs, bolt holes, tire mounting surface and rear mounting surface of an alloy tire should be removed with a wire brush and a coat of anti-seize compound must be applied prior to this. tire has been modified.
Use a suitable size spanner to remove clamp bolt. When calipers and brake tires are right size, they act like pliers that can slow car down before brake pads work and use water pressure to increase tire friction. . The caliper design usually consists of one or two pieces, protected by two or four bolts around it. These bolts are located in stub axle where tire is attached. Spraying WD-40 or PB Penetration Catalyst on bolts will make them easier to move. Check clamp pressure. The car's calipers should move slightly back and forth at idle. If this is not done, caliper may fly out due to internal pressure when bolt is removed. Be careful to stand outside when you inspect car, even if calipers have been loosened.
Check for shims or wear washers between caliper mounting bolts and mounting surface. If you have them, remove them and remember where they are so you can replace them later. You will need to reinstall padless calipers and measure distance from mounting surface to pads in order to properly replace them.
Many Japanese vehicles use two-piece vernier calipers, so only two forward-facing 12-14mm head bolts need to be removed, not entire bolt.
Attach caliper to tire with wire. The caliper will still be connected to brake cable, so hang caliper with a wire hanger or other trim so it doesn't press on flexible brake hose.
Drain brake fluid from brakes
Remove brake master cylinder cover. The brake fluid will be full of dust and some impurities from air and car parts. It also absorbs moisture from air, which can lower its boiling point. Thus, before changing brake pads and calipers, it is necessary to drain brake fluid from vehicle, but it is also necessary to make sure that brake fluid cap is open before draining. Find a good fill line and pump more if necessary. Make sure cap is open while bleeding brake fluid. And reason for adding brake fluid is that you are bleeding brake fluid from calipers, amount of brake fluid must be below fill line, and you must also have an uninterrupted supply to master cylinder.
Determine procedure for bleeding brake fluid. Generally speaking, you want to bleed brake fluid away from master cylinder first, so you should read instructions before doing this step. All car models are more or less different in this regard. If you don't have an owner's manual, you can also go to an auto parts store and ask.
Choose a suitable plastic hose and insert it into brake fluid outlet. An inexpensive aquarium hose will do. Place other end of hose into a vial or basin to pour out liquid. To prevent liquid from getting back into machine, you must raise bottle above caliper and maintain center of gravity.
Ask an assistant to brake for you. Turn off engine and ask your friend to apply brakes until you feel resistance in brakes. When they tell you loudly that they feel resistance, you should loosen air bleeder slightly and tell them to release brakes. At this time, brake fluid should be drained and poured through hose into a bottle or basin. Screw bleed screw back in when your assistant gets out of car.
Repeat this process until there are no air bubbles left in hose.
Check again to make sure there are no air bubbles. If brake fluid flows into master cylinder when you depress brake pedal, there are still air bubbles in system. Drain brake fluid before proceeding to next step.
Replace brake pads
Finally, remove all old brake pads. Pay attention to how each brake pad is connected, usually held together with metal clips. It may take a little force to pull it out, so be careful not to damage caliper and brake cable when removing it.
Install new brake pads. At this point, apply anti-seize lubricant to edges of metal surfaces and behind brake pads to prevent noise. But never apply an anti-skid agent to inside of brake pads, because if it is applied to inside of brake pads, brakes will have no friction and will fail. Install new brake pads in same way as old ones.
Check brake fluid. Check brake fluid in car and add some if it's not enough. After filling, close brake fluid reservoir cap.
Replace calipers. Thread caliper onto rotor, turning slowly to avoid damaging other things. Replace bolt and tighten caliper.
Put wheels back on. Put wheels back on car and tighten wheel nuts before lowering car.
Tighten wheel nuts. When vehicle is on ground, tighten wheel nuts in a star shape. Tighten one nut first, then cross-tighten other nuts to correct torque. See manual to find torque specification for your vehicle. This ensures that each nut is tightened to prevent tire from slipping or over-tightening.
Start car. Make sure vehicle is in neutral or stationary. Apply brake 15-20 times to make sure brake pads are in correct position.
Check new brake pads. Drive your car on a street with little traffic, but do not exceed speed of 5 kilometers per hour, and then apply brakes. If car stops normally, run another experiment, this time increasing speed to 10 kilometers per hour. Repeat several times and gradually increase speed to 35 kilometers per hour or 40 kilometers per hour. Then go back to check brakes. These brake tests can ensure that your brake pads are installed correctly and give you confidence when driving on road. In addition to this, these test methods can also help you install brake pads in correct position. Listen, there are no problems. New brake pads can make noise, but you should listen for crushing, metal and metal grinding sounds because brake pads can be installed in wrong direction (inside and out for example). These problems should be fixed immediately. .
Tips
Be sure to check if wheel is worn or uneven. Both of these conditions can cause brake noise. When this happens, tire can be reground if wheel thickness exceeds minimum thickness.
If you included a rear brake in parking brake system, remove it and adjust position.
Turning steering wheel slightly to make sure front wheels are facing out after front tires are removed will make it easier to adjust front calipers. Be sure to keep jack stand out of way during this process.
Warning
Do not disconnect brake cable from caliper as this will allow air to enter brake cable and create a mess.
Be sure to use a jack and jack stands to support wheel so it doesn't slip. Do not rely entirely on jack.
Do not apply lubricant to brake pads. If this happens, brake pads will have no friction and brake pads will be scrapped.