Change the manual rear brake pad, the handbrake should be released, why?

After replacing the brake pads, of course, release the handbrake.

The handbrake acts on the rear wheels, and the rear wheel brake pads produce huge friction with the brake disc (hub) after the handbrake is pulled.

The rear brake pads cannot be removed without releasing the handbrake.

The handbrake is connected to the rear brake pad through the wire rope, if the handbrake is tightened, the rear brake pad is in a tight state, there is no way to disassemble the brake pad, when the handbrake is released, the brake pad is also released at the same time, it is convenient to replace.

The brake pads cannot be disassembled when locked, and forced disassembly will damage the parts. Under normal conditions, prop up the wheels, release the handbrake, disassemble the brake disc, and remove the brake pads before they can be replaced.

If you don't release the handbrake, the handbrake will not be able to remove the brake pads if it is tightened all the time.

Here's how to change brake pads from the electronic handbrake:

Prepare materials: jack, tire wrench, new brake pads, wrench 1, find the point of the top car and use the jack to lift the part to be replaced off the ground.

2. Use a tire tool to remove the tire.

3. Use a screwdriver to expand the sub-pump (labor-saving during installation), 4. Remove the sub-pump screws and remove the two bad brake pads.

5. The new brake pads are slanted with sandpaper around the side (that is, to prevent the new brake pads from making abnormal noises when they are installed), 6. Install the brake pads, and the brake pads should be stuck in place.

7. Use a wrench to tighten the screws of the sub-cylinder, be sure to tighten it (not sloppy), 8. Install the tire, take out the jack, and then go back to the car and step on the brakes a few more times (so that the sub-cylinder compresses the brake pads), if you don't step on it, there will be no brakes.

1. First of all, disassemble the wheels, reset the brake cylinder, it is best to have special tools, if not, you can use a screwdriver;

2. Then disassemble the fixing bolts of the sub-cylinder, remove the old brake pads, install the new brake pads, install the fixing bolts of the sub-cylinder and tighten them, and install the wheels;

3. After all brake pads are replaced, start the vehicle and press the brake pedal several times.

Determine that the brake pads need to be replaced.

Look at the thickness: the thickness of the new brake pad is about centimeters, if it is worn to one-third, that is, when the thickness is less than 5 mm, it is recommended to replace it in time.

Listen to the sound: If there is a metal friction sound when braking, it may be that the brake pads are worn to the lowest thickness, and the limit marks on both sides of the brake pads touch and rub to the brake disc to make an abnormal sound, which needs to be replaced in time.

The screw is driven by a motor, and the rotation of the screw is driven and threaded into a nut-like structure.

There is no computer to replace the electronic handbrake brake pads as the same procedure as replacing ordinary brake pads, but the power cannot be turned off, because there is a position memory, if the power is lost during the replacement process, the sensor may send an error message.

After changing the brake pads, the handbrake is too loose, at this time, it is necessary to adjust and restore the handbrake pull rod by adjusting the handbrake pull line, and the handbrake pull line (inside the steel wire) is broken, at this time, it is necessary to find a professional vehicle repair shop in time to repair and replace the new handbrake pull cable for use, and then try to avoid sharp pull and release when using the handbrake.

Hello friends, the electronic hand brake to change the brake pads needs to use a computer to retract the brake cylinder behind it. If there is no computer, two wires can be connected to the electronic sub-pump at the back. Directly let the electrons take back.

When wiring the brake cylinder, be sure to turn off the ignition switch. I hope my answers will help you, and if you have any questions, you can always contact me. BBA Mercedes-Benz BMW Audi Maintenance wishes you a happy life, all the best, and a lot of money!

The brake pad replacement process for the electronic parking brake.

Hello car owner, you must first loosen the motor to the installation position.

Electronic parking brake is a new device that adopts electronic control mode to realize parking brake. Mounted on the left and right brake calipers on the rear wheels of the vehicle, the electronic handbrake system is equipped with a motor assembly and is controlled by a special computer. It should be noted that many models, the rear brake cylinder with electronic parking brake motor, manual can not compress the motor, can only be recovered and released by the diagnostic instrument, that is, professional software tools are required to replace the brake pads normally.

When the worn old brake pads are removed, if the software power is not used, the piston of the sub-cylinder may be automatically ejected, but the piston can no longer be pushed hard, so that the new brake pads cannot be installed.

Take the example of Volkswagen Audi (with electronic parking brake) to illustrate how to replace the brake pads:

1. Remove the rear wheel, connect the diagnostic instrument, and lift the vehicle;

2. Turn on the ignition switch, release the handbrake (the rear wheel can rotate freely), and enter the test program;

3 Enter the 53 parking brake system;

4 Enter 04 Basic system settings;

5 Enter channel number 007 to hear the sound of the rear wheel turning with a motor for about 5 seconds. The two rear parking brake motors are retracted. The top sub-pump can remove the old brake pads;

When replacing the rear brake pads, if the "007" channel is entered in the "basic setting", if the decoder prompts "there is no such basic setting", then the self-learning process of ejection and retraction of the wheel cylinder is carried out three times in the basic setting 010 (this process is longer, wait for the brake cylinder to have no sound, and then do other steps). Then execute 007 again in the basic settings

6. Replace the new brake pads on the two rear wheels, after installation;

7 Enter 04 System Basic Settings and enter 006The sound of the motor turning on the rear wheel can be heard for about 5 seconds. The two rear wheel parking brake motors are ejected and reset.

8 Clear the fault code, turn off the ignition switch, and remove the diagnostic instrument! Load the wheels and test the run. In the case of an Audi A8L Q7, you also need to enter the thickness of the brake pads (not required for the A6L).

9 Enter the 10 channel to adjust the match (note: it is a 10 match, not the 04 base setting).

10 Enter channel number 06

11. Enter a new matching value (that is, the thickness of the brake pad, the general range is between 9-14, the thickness of the brake pad can be measured with calipers, and the thickness of the new brake pad is generally 12). Enter 12.

12 Press OK, and the screen shows that the channel is successfully matched. 13 Clear the fault code, turn off the ignition switch, and remove the diagnostic instrument! Load the wheels and test the run.

Preparation tools: cross wrench, jack.

1. First remove the tires.

2. Then loosen the nut of the brake pad and take off the brake pad.

3. Then replace the new one.

4. Tighten the nut, remember to tighten it.

5. Finally, after changing the brake pads, install the tires.

Because the new brake pad is processed after the completion of the process, the surface is not absolutely flat, just after the new brake pad is replaced, the unplane area on the surface of the brake pad will first rub against the brake disc, the contact surface at this time is smaller than the normal working contact area of the brake pad, and the increase in braking distance will make you find that the car can not brake, especially if it is at high speed because of the fast speed, it is easy to have an accident.

Many people feel that the brake performance is not good after changing the brake pads, in fact, this is the reason.

There is generally an explanation on the brake pad manual, usually about 500 kilometers, the brake pad can complete the normal running-in, and the maximum braking effect can be exerted after the contact surface with the brake disc reaches normal. Within 500 kilometers, you should be careful when driving.

Finally, I have to say that I will not repair the car to change the brake pads to find a car repair master to test the car, try to see if there is a brake failure and abnormal noise, must not drive away without a test, ** do not do a good job to adjust immediately.

Hello, the loose handbrake you said should mean that the handbrake is pulled farther away after replacement, and the stroke is longer, if so, the possible reasons are that the friction material of the brake pad is soft, and the ejector of the pull rod is not in place.

Because now the handbrake, there is an adjustment nut in the back, and it will become thicker after he changes the new brake pads, and you need to readjust the length of the handbrake cable.

1.There is a problem with the rear brake pad installation. Improper installation or wrong installation will result in no handbrake after installation. The hand brake system of a motor vehicle can only be used by the vehicle's rear and front false wheel brakes, so the rear brake pads need to be reinstalled.

2.The brake pads of motor vehicles need to be checked frequently in daily use. Under normal circumstances, brake pads need to be checked every 5000 km.

At the same time, it is necessary to check the thickness of the brake pads to see whether the wear degree on both sides is the same and whether the return position is normal. After confirming that there is no problem, the motor vehicle brake pads can be used normally. If the brake pads are seriously worn, they need to be replaced in time.

1. The general thickness of the brake erection Sunzhou car pad is in, and when the thickness is less than that, the brake pad should be replaced.

2. Many vehicle brake pads have limit position signs, which must be changed once they reach this position.

Some models have a gauge light, and when the thickness of the brake pads reaches the limit, the light will light up to remind you that you are about to change the brake pads.

3. When you feel that the braking distance becomes longer, the pedal becomes softer, and the brake response is slow, the brake pads should be checked.

4. Straight ** brake oil can. When the brake fluid is not leaking, and the oil in your brake oil pot is inexplicably dropping a lot.

At this time, it means that the brake pads are worn out a lot. Because the brake clearance of the vehicle is automatically adjusted, when the brake pads are thinned, the oil storage capacity of the sub-cylinder will be increased, and the total cylinder oil volume will inevitably be reduced.

After the car handbrake is released, it is still braked, you can heat up the car first, then start the car slowly, increase the throttle, feel the car, the handbrake will be released naturally, and then under the premise of ensuring safety, tap the brake and polish the contact surface of the brake disc smooth. If this happens again, then you will need to go to a garage to replace the brake cable.

There are many reasons for the car handbrake to let go of the rear wheel or in a locked state, there are many reasons, the handbrake line is frozen, the brake friction pad is frozen, the brake cylinder is broken, the brake pad and the system drum are combined with water, and the handbrake cable is rusty and stuck in the dust. The maintenance cost of rear wheel locking generally needs 100 yuan, and in the case of not replacing parts, how much money is needed depends on what causes it.

When the weather is too cold and the temperature is too low, the skin of the handbrake will harden or there will be water that will freeze, so even if the handbrake is put down, the cable inside will not return to its place, and it will be dried in the sun or showered with boiling water. There is also the freezing of the brake pads and the brake drum, which causes the two parts to be inseparable from each other, and they need to be showered with boiling water or gently knocked by Zheng Shi to separate them.

In rainy days or after washing the car, the brake pads and the system drum are wet, and the wheels of the car will lock up after being parked for a few days, because the brake pads and the system drum are rusty and combined, at this time, you need to drive back and forth to see if you can separate, you can't use 100 degrees of boiling water, and the heated expansion is separated; Alternatively, you can tap the brakes with a rubber hammer to separate them.