Release the brake pedal and the brake does not return. What should you do?
Everyone is familiar with brakes. Bicycles, electric vehicles, and cars all have brakes, but if you are asked to talk about the principle of braking, I think you may not necessarily say it!
Everyone knows the law of conservation of energy, that is, energy will neither be generated out of thin air, nor will it disappear out of thin air, it can only be transformed from one form to another, or from one object to another, in the process of transformation or transfer. , The total amount of energy remains unchanged. When applied to the brakes, friction is generated between the brake pads and the drum or disc, and the kinetic energy of the car is converted into heat during the friction process. Isn’t it a bit unimaginable that the car only changes from 100km/h to 0km/h It takes a few seconds to see how much heat the brake system has to withstand.
Knowing the principle of braking, let us talk about the braking problems that we usually encounter. One of the problems is that the brakes are locked and will not return after being released. This situation is usually accompanied by the lighting of the brake warning light!
Possibility 1: The return spring is broken or de-elastic. Everyone has played with springs. If the force is too strong, or the tossing time is too long, the spring will be damaged. This is relatively simple to repair. Just replace the brake pedal return spring. It's okay.
Possibility 2 The brake pedal cannot be returned, and the car cannot move forward. The brake caliper needs to be replaced at this time.
Possibility 3: The rear wheel axle bearing is fixed or installed incorrectly/the rear wheel bearing is worn, dry or damaged. Everyone knows that the car has four wheels, and each wheel is fixed to the car body by the bearing. If the bearing is misaligned, the entire car The body will also be uncoordinated, the brake pads may appear in an inappropriate position, and the pedal will not return.
Possibility 4: Front and rear brake pads are contaminated by lubricating oil or brake fluid/brake pads are worn or damaged/brake pads are polished or deformed due to overheating. The brake pad is the core component of the entire brake system, and it is also one of the components that are easily contaminated by lubricating oil or brake fluid. If the check is a problem with the brake pad, whether it is contaminated or worn, or overheated and deformed, it needs to be directly Replace the brake pads.
Possibility 5: The brake hose or brake shoe problem, everyone knows the needle tube, the whole process of delivering brake fluid is the same as an injection, because the fluid cannot be compressed, the brake fluid acts as a force transmission medium . You can find a car Yi'an merchant, they can do the most professional inspection and repair for your car! Group purchase car wash for 6.6 yuan, fill in the form and also free car wash, size and maintenance are more value-for-money discounts, hurry up and scan the above two-dimensional WeChat Code it, you can have it! The blockage, knotting and damage of the oil pipe directly cause the pedal to be unable to step down. As for the brake shoes now only appear on the old cars, the old cars usually have the front disc and the rear drum. The drum brake means that the two brake shoes are stretched out under the action of the brake wheel cylinder, propping up the brake shoes and rubbing against the inner wall of the brake drum. To slow down or stop, the function of the brake shoe is the same as that of the brake disc, but the form of expression is different. There is a problem, just like replacing the brake pads, just change it!