Brake Shoes SAE 3020

trailer brake shoe SAE 3020

specification: Standard and customized

Material：Q235， Q345

The importance of the trailer brake system need not be said more, the owners should be very clear, once the problem occurs, it is more troublesome to deal with. The brake system generally includes brake pedals, brake boosters, brake warning lights, hand brakes, brake discs, and should be adequately focused on any problems. In the case of trailer brake shoes, although it is not necessary to replace them too often, it is necessary to pay attention to the mileage or cycle when replacing. If it is not replaced for a long time, it will greatly affect its performance. Then, how many kilometers of trailer brake shoes are changed, must you change the original factory?

The replacement of trailer brake shoes is related to mileage, but the two are not positively related. In other words, there are other factors that affect the replacement cycle of the trailer brake shoe, such as the driving habits of the owners, the car environment and so on. For most ordinary car owners, the brake shoes can be replaced once in the range of 25,000-30,000 km. If the driving habits are better, usually there are very few big feet on the brakes, and the driving conditions are also good, just use If you are commuting to and from work, you can properly extend the replacement cycle of the brake shoe. In fact, the owners can also determine whether the brake shoes need to be replaced by the following methods.

First, you can view the thickness of the trailer brake shoe. The new brake shoe is about 15 mm thick, and the trailer brake shoe becomes thinner due to wear after long-term use. If you find that the thickness of the brake shoe is only about one-third of the original, that is, about 5 mm, then you can consider replacing the brake shoe.

Secondly, it is also possible to feel the degree of wear of the trailer brake shoes after stepping on the brakes. If the normal braking of the brakes is similar to the conflict between the iron piece and the iron piece, it can be clarified that the brake shoe is now worn out quite seriously, and the demand is replaced as soon as possible, otherwise the brake failure may occur. Of course, this method is still difficult to directly look at the thickness of the brake shoe. Since the car has many other noises during driving, such as wind noise and tire noise, these noises may cover the brakes when the brakes are applied. The sound of the shoe announced. In addition, some old drivers who have experienced a lot of driving experience can also judge the degree of wear of the brake shoes by the feeling of the brakes. The brakes are soft and the brake interval is significantly longer, which can also be clarified. The brake shoe requirements were replaced in time.

Is it necessary to replace the trailer brake shoe to pick the original one?

This is not necessarily the case. The most important thing is to look at the quality and performance of the trailer brake shoes. It is ok to satisfy both of these points.

Secondly, when replacing the trailer brake shoes, pay attention to the conflict coefficient. Too high is simple to form the wheel to lock, too low and can not be stopped, to choose a moderate conflict coefficient. Of course, we must also consider the comfort of the brake shoes. For example, some brake shoes are more noisy, and even smoke, odor, dust, etc., such brake shoes are obviously unqualified, should Replace as soon as possible.

The trailer brake shoe wear speed is different from the common phenomenon. Under normal conditions, the brake speed of the two front wheels of a car should be common. The wear speed of the two rear wheels should be common. Most of the front wheels are worn faster than the rear wheels. The brake shoes are replaced only after the front brake shoes are changed twice, which is caused by the vehicle's center of gravity moving forward during braking. Looking at the brake shoe wear condition sometimes reveals that one side wears to the limit and the other side is very thick. What is going on?

The vast majority of the causes are caused by poor return of the brake cylinder. When the brakes are not applied, the gap between the brake shoes and the brake discs is very small, and the two are close together so that they can respond quickly when the brakes are applied. When the brake is applied, the piston of the brake cylinder moves outward to apply force to the brake shoe, and the two brake shoes clamp the brake disc, and the disc and the disc collide with each other to generate braking force. When the brake is released, the piston of the brake cylinder moves back due to the absence of the braking force, and the brake shoe agilely recovers to the initial condition. However, if the brakes of one of the brake cylinders are poorly returned, even if the brakes are released, the pistons will not go back or may go back slowly. The brake shoes will be subject to additional wear, and the brake shoes on this side will wear out. Faster. The pistons of several car sub-pumps have been stuck, and one side of the wheel has been in a light brake condition.

In addition to the piston stuck, the guide pin of the sub-pump may cause poor return if it is not smooth. The sub-pump can move left and right to require a slide. The slide is the guide pin. It is moved on the guide pin. If the guide pin rubber sleeve breaks and enters a lot of dust and dirt, the conflict resistance is greatly increased. Maybe the brake shoe is not working properly and the guide pin is bent. In both cases, the moving speed of the sub-pump is also hindered, and the brake shoes are worn quickly.

The above are the two most common reasons. The difference between the speed and the slowness here is that there are very different conditions, such as one side grinding, and the other side half or maybe one third. If the difference is not normal, the brake shoes on both sides of the car will not be completely the same degree of wear and will be different. Because the braking force of each brake shoe is different when braking in different road conditions, for example, when turning and braking, the center of gravity of the car will be offset to one side, and the braking force of the two wheels will be different, so the brake shoes are worn. It can't be exactly the same, it can only be said to be roughly the same.

Can the brake pump return to a bad position to drive?

When the brakes are felt, the brakes will be deviated, and the left and right braking force will be relatively large. If you are completely stuck in the brakes, you can feel it at the start and acceleration, and you will feel the car is particularly heavy, like pulling the handbrake. Some will also hear the clash of crickets, and the wheels on this side will be abnormally hot. In short, the car will feel abnormally open when it is opened. At this moment, it is necessary to check it in time. The brakes are still dangerous. The driver can't control the direction at all, especially when the speed is fast.