D1123 Brake Pads

Brake pad test method

When it comes to the test of automotive brake pads, the first thing to say is the mechanical equipment used for the test and the working conditions of the test. At present, the national standard for the detection of the friction coefficient of the brake pad is realized by a constant speed test machine. The constant speed test machine detects the friction coefficient of the brake pad instead of taking a complete brake pad for inspection. Instead, it cuts two 25m*25mm small squares from the brake pad friction block, then smoothes it and puts it on the testing machine. The specified location.

The working condition of the fixed speed tester is that the rotational speed of the disc is constant; the ambient temperature is constant; the pressure applied to the friction block is constant; the sample is a small friction block rather than a complete brake pad. When testing for temperature rise (from 100 °C to 350 °C), the disk rotates at a constant speed of 5000 rpm at each temperature point. The test opportunity records the average friction coefficient at each temperature point. When the temperature is detected (350 °C-100 °C), the test is performed. The machine disc rotates at a constant speed of 7500 rpm (1500 rpm at each temperature point), and the test machine also records the average friction coefficient at each temperature point.

Car brake size

The braking force of a car is proportional to the weight of the car. Generally, the braking force of the car is about 3000N. The ratio of the total braking force of the automobile to the weight of the whole vehicle is more than 60% of the no-load and the full load is more than 50%; the ratio of the braking force of the bearing shaft to the axle load is more than 60% of the no-load and more than 50% of the full load.

The braking effect of a car is related to many factors, such as the brake disc, the friction between the sheets, the friction between the tire and the ground, the condition of the road surface, and the like. For disc brakes, the amount of braking force is related to the pressure exerted by the brake lining on the brake disc, the contact area between the brake lining and the brake disc, the friction coefficient between the brake lining and the brake disc. . In order to enable the running car to slow down or stop, the ground uses an external force opposite to the direction of travel to cause the car to decelerate. This external force is called the ground braking force. For a certain quality car, the greater the braking force, the greater the braking deceleration and the shorter the braking distance.

Brake pad alarm

At present, most of the cars have installed brake pad warning lights. Usually, the owner will use the brake warning lights on the instrument panel to light up as the basis for the brake pads. The warning light of the brake pad is the last bottom line. At this time, the brake pad has almost lost its effect. The metal plate and the brake disc of the brake pad are already in the state of iron grinding iron. If the brake pad is not replaced in time, the brake disc is greatly depleted. It is recommended to replace the brake pads near the end of life early, not just relying on warning lights to determine.

Method of extending the service life of brake pads

The effective use of brake pads is about 30,000 to 40,000 kilometers, which is slightly increased or decreased according to personal habits. Because the driving in the urban area is relatively crowded, the brake pad loss is correspondingly large, and the sudden braking should be minimized when driving, so that the brake pad can obtain a longer service life. At the same time, it is recommended that the owner check regularly to see if the brake pads and other related components are loose or displaced. In addition, it is necessary to carry out a complete set of car brake system care, increase lubrication, check whether parts are rusted, etc., and recommend replacing the brake oil every year.