Brake Pads
Brake pads are also called brake skins. In the braking system of a car, brake pads are the most critical safety parts, and all braking effects are determined by brake pads, so it is said that good brake pads are the protector of people and cars.
Brake lining generally consists of steel plate, adhesive heat insulation layer and friction block.
The steel plate is painted to prevent rust, and the painting process uses SMT-4 furnace temperature tracker to check the temperature distribution of the painting process to ensure the quality.
The heat insulation layer is made up of non-heat transferring material for the purpose of heat insulation.
The friction block is composed of friction material and adhesive, which is squeezed on the brake disc or brake drum to produce friction when braking, so as to achieve the purpose of vehicle deceleration and braking.
Due to the friction, the friction block will be gradually worn out, and generally speaking, the lower the cost of the brake pad, the faster it will wear out.
Classification
Automotive brake pads are divided into the following types: brake pads for disc brakes, brake shoes for drum brakes, and lining pads for large trucks.
Brake pads are mainly divided into the following categories: metal brake pads and carbon ceramic brake pads, where metal brake pads are divided into less metal brake pads and semi-metal brake pads, ceramic brake pads are classified as less metal, and carbon ceramic brake pads are used with carbon ceramic brake discs.
Braking principle
The working principle of brakes is mainly from friction, using the friction between brake pads and brake discs (drums) and tires and the ground, converting the kinetic energy of the vehicle’s travel into heat energy after friction to stop the car.
A good and efficient brake system must be able to provide stable, sufficient and controllable braking force, and have good hydraulic transmission and heat dissipation capabilities to ensure that the force applied by the driver from the brake pedal can be fully and effectively transmitted to the master pump and each sub-pump, and to avoid hydraulic failure and brake recession caused by high heat.
Service life
Brake pad replacement depends on how long your pads have been in use for the life of your car.
Generally if you have exercised more than 80,000 miles the brake pads will need to be replaced.
However, if you hear a grinding sound from your wheels, you should replace your brake pads no matter how many miles you have.
If you’re not sure how many miles you’ve covered, you might want to go to a free pad replacement store and buy brake pads from them or go to an auto service store to have them installed.
Conservation methods
1. Under normal driving conditions every 5,000 km brake shoes check, not only to check the remaining thickness, but also to check the state of shoe wear, the degree of wear on both sides is the same, whether the return is free, etc., found abnormal conditions must be dealt with immediately.
Brake shoes generally consists of iron lining plate and friction material two parts, must not wait for the friction material part are worn out before replacing the shoes.
For example, the front brake shoes of the Jetta, the thickness of the new piece is 14 mm, and the limit of the replacement thickness is 7 mm, which includes more than 3 mm of iron lining plate thickness and nearly 4 mm of friction material thickness.
Some vehicles have a brake shoe alarm function, once the wear limit is reached, the instrument will alarm to prompt the replacement of shoes.
Reached the use limit of the shoes must be replaced, even if it can still be used for a period of time, will reduce the effectiveness of braking, affecting the safety of driving.
3. Replace the brake pads with the original spare parts provided by the factory, only in this way can the brake pads and brake discs have the best braking effect and the least wear.
4. When replacing the shoes, you must use a special tool to push the brake pump back.
You cannot use other pry bars to press back, which will easily cause the brake caliper guide screw to bend and make the brake pads stuck.
5. After the replacement, be sure to step on the brakes a few feet to eliminate the gap between the shoes and the brake disc, resulting in the first foot without brakes, prone to accidents.
6. Brake shoes after replacement, need to break in 200 km to achieve the best braking effect, just replace the shoes must be careful driving
Inspection method
1. Look at the thickness: The thickness of a new brake pad is generally around 1.5 cm, which will gradually become thinner with constant friction in use.
When the thickness of the brake pad is only about 1/3 of the original thickness (about 0.5 cm). Owners should increase the frequency of self-inspection and be ready to replace them.
There are individual models that do not have the conditions for visual inspection due to wheel design, and need to remove the tires to complete.
In the latter case, by the time the warning light comes on, the metal base of the brake pad and the brake disc are already in a state of iron grinding iron, and at this time, you will see crystal shiny iron chipping on the tire near the edge of the wheel rim.
Therefore, we recommend checking the brake pad wear condition regularly to see if it works, rather than just trusting the warning light.
