brakes, also known as brake pads. In the automotive brake systems, brake pads is the most critical safety components, the braking effect are all good or bad brakes play a decisive role in film, so that good brakes is the patron saint of people and cars.
1. Noun interpretation brake pads
brakes, also known as brake pads. In the automotive brake systems, brake pads is the most critical safety components, the braking effect are all good or bad brakes play a decisive role in film, so that good brakes is the patron saint of people and cars.
2. The brake principle
Brake works mainly from friction, brake pads and brake discs using (drum) and tire friction with the ground, to convert kinetic energy into thermal energy of the vehicle traveling after rubbing, the car stop. A good efficiency of the braking system must be able to provide stable, sufficient braking force can be controlled, and has good heat dissipation and hydraulic transmission, to ensure that the driver applied the brake pedal force is transmitted to the master cylinder can be sufficiently effective and each wheel cylinder, and avoid high fever caused by hydraulic brake failure and decline. Braking systems on the car are divided into two major categories of disc and drum, but in addition to cost advantages, drum brake efficiency is vastly inferior disc brakes, so the brake system in question is the only disc brakes a main
3 composition brake pads
brake pad (brake lining) is generally composed of a steel plate, the adhesive insulating layer and the pad, after painting the steel sheet to be rust, paint process with SMT-4 temperature tracker to detect the temperature distribution of the coating process to ensure quality. Wherein the insulating layer is composed of a material that does not transfer heat purpose of insulation. A friction pad material, a binder, is compressed on a friction brake disc or brake drum during braking so as to achieve the purpose of braking deceleration of the vehicle. Due to friction, the friction block will gradually be worn, in general, the lower the cost of brake pad wear faster. Friction materials after use timely replacement brake pads, or brake disc will be in direct contact with the steelIt will eventually lose braking effect and damage to the brakes.
4. Classification brake pads
● brake pad for a disc brake
● brake shoes for drum brakes
with ● in the truck to the film
5. the method of curing the brake pads
when the brake shoe brakes commonly known, are consumables will gradually wears in use, the wear limit position It must be replaced, otherwise it will reduce the braking effect, even cause accidents. Brake shoe related to safety of life, must be treated with caution.
● the
normal running conditions of 5000 km with each brake shoe inspection time, not only to check the remaining thickness, but also to check the state of wear shoe, if the degree of wear on both sides of the same, whether the return freely etc., found irregularities must be addressed immediately.
● brake shoe generally consists of two parts and iron lining friction material, the friction material must not other parts are not the only replacement of the grinding shoe. E.g. Jetta (Gallery) vehicle front brake shoe, the new film thickness of 14 mm, the limit thickness is replaced 7 mm, including three millimeters iron plate thickness and the thickness of the friction material nearly 4 mm. Some vehicles with brake shoe alarm function, once the wear limit is reached, the instrument will alarm to replace the shoe. Reached the limits of the use of shoe must be replaced, even if still capable of use for some time, will reduce braking effectiveness, impact traffic safety.
● brakes want to change the original spare parts replacement, the only way to make the braking effect between the brake pads and the brake disc preferably, to minimize wear. ?
● Replace the hoof films must use a special tool to brake cylinder back to the top. Can not be pushed back by another crowbar hard, so easily lead to bending of the caliper guide screws, brake pad stuck.
● after replacement, must be stepped kicks brake shoe to eliminate the clearance with the brake disk, causing the first foot brake is not, prone to accidents.
● replace the brake shoe, running 200 km required in order to achieve the best braking effect, just for the shoe to be cautious with
6. The method of replacement brake pads [123 ]
As the saying goes “we must first of its profits”, replace the brake pads to save maintenance costs, we must prepare a suitable tool. Replacement of brake pads we will use the jack, suitable socket wrench, wrenches, screwdrivers, sandpaper, grease and so on. Some tools vehicleGenerally equipped, as well as the demolition of the tire cross jack sleeve; and some need to buy their own. All tools and parts brake pads can be purchased through the net.
find all the tools and parts, we can begin to replace the brake pads. We all wheel fastening bolts loosen ½ turn, without completely unscrewing. Before lifting the vehicle using tire friction with the ground more easily loosen the bolts of the wheel, which is why we are the first step to do this.
The second step, we use the vehicle jack in a raised position from the top side of the vehicle. Vehicle dedicated to a raised position lifting the body parts of the vehicle, typically located on the front and the rear wheel vehicle body forward “beam.” Usually there will be a vehicle lift position raised rubber palm, it is easy to touch the touch. We just need to replace the vehicle lifted to the brake pads to the wheel slightly off the ground. Then we will be able to wring all the wheel bolts and remove the wheel. Some of the aluminum alloy vehicle wheels, because of the unique structure of the wheel, so that after the bolt is removed, the wheel is still stuck in the swivel bearing of the wheel. If you encounter the above situation, we can try to guess their feet inside the tire side edges inwardly or hand flap forcibly turns leading and trailing sides of the tire, which helps the tire prolapse.
Remove the wheel against the brake disc below, to prevent the fall of the vehicle hydraulic jacks relief casualties.
generally disc brake wheel cylinders of the vehicle by using two bolts on the cylinder holder, and then the stent cylinder by two bolts fastened on the pivot bearing. Replacement of brake pads, we need only remove the two bolts fastening the brake cylinder.
After releasing the two screws, we can remove the brake wheel cylinder. Because with a flexible hydraulic line on the brake wheel cylinders, be careful not to pull too hard, to its resting next to the front axle suspension can be.
Next we need to polish the brake pads, the brake pads and the brake disc side contact edge chamfer grind. In just moreReplacement of brake pads without changing the brake disc of the maintenance operation, if not the brakes the brake shoe polish abnormal sound is generated. This is because the old brake discs will be above a trench, which is the old brake pads for wear and tear caused by brake discs; the old brake discs coupled with new brake pads will be flat because of the friction surface is too small to produce abnormal sound. When both replacing the brake pads and brake discs, we do not need to polish the chamfer, can be installed directly.
We need good polished brake pads coated with some grease in which the two parts of the projections, the new object is to reduce the brake pads and the wheel cylinder holder knocking abnormal sound.
Before installation brake pads, brake wheel cylinder projecting we need to push in the piston, so as to hold the new brake pads thick. In order to avoid the brakes with brake oil oiler oil spill, it is recommended to extract part of the brake fluid in the brake oiler, a good replacement brake pads and then re-add the right amount of brake fluid in accordance with the level oiler at the push in the piston. It is noted here that, different types of brake fluid can not mix (e.g., DOT3 and DOT4), it is preferable to add the respective owners of brake fluid upon addition.
Next we put into the cylinder on the brake shoe holder, the brake pads are not interchangeable outer attention. Then, we can put the brake cylinder to cylinder bracket on the card.
Finally, the brake wheel cylinder is screwed bolt, and tightening torque wrench. In general, brake wheel cylinder bolt fastening torque is 20-30 Nm, specific parameters can be found in the relevant service manual models. After installing the brake pads can be fitted on the wheel, the rear wheel wheel fastening bolts installed remember, the standard wheel bolt tightening torque of 110-140 Nm, specific parameters can be found in the relevant service manual models. Rear wheel and the front wheel brake pads replacement is very similar, it is not described in detail here.
Conclusion:
to replace the brake pads of the whole process is not very complicated, most people will quickly learn . In the process of replacing the brake pads due to the vehicle lift, we need to note that security, even if the underlying few bricks in the car can occur during critical situationsSave your life. Hopefully the above description can help you keep a car and the car.