Wednesday, June 22, 2011

How to replace Brake Pads and brake Shoes on car?

Here are some resources and challenges to consider before deciding to change your brakes:
A repair manual for the car/truck is highly recommended, because new brakes do not come with instructions. You may find a manual at your local library or find brake R&R procedures online.
For disk brakes, the calipers are removed using a wide variety of tools. The bolts may be torx head, allen head, or hex head, among others. They are occasionally hard to get out. For rear disk brakes, some designs require special knowledge to reset the parking brake adjustment.
Drum brakes have several challenges, including the difficulty of assembly without specialized drum brake tools, a wide variety of complicated configurations, and the potential for the drums sticking on the hubs due to lip formation on the edge of the drum.

Tips if you decide to DIY:
Front brakes
1. Set parking brake or block rear wheels, jack up the front of the car, and place jack stands under the frame. You may want to loosen the lug nuts on the front wheels before jacking the wheels off the ground.
2. Check the level of brake fluid in the reservoir. If full, remove 2-3 ounces of fluid, if possible, to avert overflowing the reservoir when the brake caliper pistons are collapsed back into the their cylinders.
3. Remove front wheels and place in a way so that you remember which one goes on which side. This is also a good time to inspect your tires for even wear. Also, if you have a full set of jack stands, consider rotation wheels from front to back.
4. Work on one side at a time. In case you get confused about how to reassemble, you can refer to the other side.
5. Determine what type of bolts hold your caliper to the wheel hub, and loosen the 2 bolts holding the caliper on. Some calipers are designed to hinge open on a pivot, such that only the top bolt will come out.
6. If you do not have a large c-clamp to collapse the caliper piston back into it's cylinder, consider using a large screwdriver to pry between the inner pad and the rotor to collapse the piston. If you do this, be careful not top scratch the rotor.
7. Pull the caliper out of it's bracket and use a coat hanger to hang it from the spring/strut so as not to put tension on the hose.
8. Remove and inspect the old pads for wear. Replace all pads if any are worn out needed. As as rule of thumb, replace when the lining has less than 1/8" of material before the rivet or bond, or if any warning tang is near the rotor.
9. If you haven't collapsed the piston yet, do so now using one of the old pads over the piston to apply your c-clamp.
10. Inspect the rotor for damage. If there is significant damage or if the brakes had been vibrating before the brake job, have the rotors resurfaced.
11. Replace pads. Apply quieting compound on new pads if provided with the pads. Also reinstall quieting plates and/or any clips that the design uses to hold the pads in position.
12. Reinstall the caliper.
13. Repeat procedure on the other wheel.
14. Replace wheels, remove stands, and let the car down.
15. Pump the brake pedal to bring the pads up to the disks for use.

Rear Brakes
1. If car is front wheel drive, set transmission in park or manual in reverse, and block the front wheels.
2. You may want to loosen the lug nuts on the wheels before jacking the wheels off the ground.
3. Remove wheels and place in a way so that you remember which one goes on which side. This is also a good time to inspect your tires for even wear.
4. Work on one side at a time. In case you get confused about how to reassemble, you can refer to the other side.
Rear Disk Brakes
Follow above procedure for front disk brakes, but ensure any special procedure in your repair manual required to adjust parking brake is used.
Rear Drum Brakes
1. Check your manual to determine if the bearing must be removed before the drum will come off--remove bearing if necessary.
2. Remove the drum. If it sticks, try rotating while pulling. If necessary, remove the rubber plug from the access hole in the back of the hub and use a screwdriver to back the shoes down. Refer to your manual on how to back off the self-adjuster for your particular design.
3. Inspect drums for damage and wear lip. Have drums resurfaced, if necessary or desired.
4. Inspect the shoes for wear. 1/8 inch of liner may last 50K miles. Note if there is a difference in the length of the linings on the 2 shoes.
5. Inspect brake cylinder for leakage--pull open the boots on each side. If more than a drop of brake fluid is released or if desired, replace the cylinder (procedure not covered in this tip).
6. If shoes are worn out, remove shoes--first remove upper return springs, noting how they were attached. Use a brake spring tool, if available, else use pliers or vice grips. Arrange springs in order nearby as you remove them. Use holddown spring tool (or pliers) to remove holding springs. Note position and configuration of self-adjuster components and remove them from the shoes. Note how the parking brake mechanism is attached to one of the shoes, and unhook from the shoe. If there are any pins or other hardware on the old shoes that did not come with the new shoes, remove those as well. Also, ensure the self adjuster is free to rotate/adjust or free up and lubricate as needed. Replace any damaged or corroded brake parts with a brake hardware kit as necessary or desired.
7. Note which shoe is the front versus the back shoe, and assemble new shoes with any hardware that is required.
8. Attach parking brake mechanism to shoe.
9. Attach shoes to the hub using retaining springs. Use retainer spring tool, if available.
10. Replace parking brake hardware and self-adjusting mechanism.
11. Replace all return springs using brake spring tool, if available, else use pliers or vice grips.
12. Repeat procedure on the other wheel.
13. Replace drum and check for adjustment. There should be rubbing but not significant drag on the drum. Adjust self-adjuster to get the shoes up close to the drum. Some extra clearance is OK, as the brakes will self-adjust later.
14. Repack and replace bearing, if removed. Tighten bearing nut as specified in repair manual.
15. Replace wheels and lower vehicle.
16. Check brake pedal travel. If excessive, drive car in reverse and repeatedly apply brakes to adjust brake shoes until pedal travel is normal.
17. Check parking brake for normal operation.

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1 comment:

  1. Replacing brake pad is very important for your safety. when you are looking to buy a brake pad thing that you should keep in mind is that brake pad should be high quality brake pads.
    Brake Shoe Manufacturers

    ReplyDelete