Brake Shoes GN 3020

Heavy duty truck  rear brake shoe GN 3020 

The  rear brake shoe is a very important part of the car. Its main effect is to stop the car. However, if the  rear brake shoe is used for a long time, it will show a decline or malfunction. The consequences are unimaginable. The six dangerous signals of the brake shoe These are things that cannot be ignored.

There are many reasons for the brake failure. First, the brake system lacks the necessary maintenance. There are too many impurities in the brake master cylinder, the seal is not tight, the vacuum booster pump fails, the brake oil is dirty, or the brake fluid is mixed and used to show the air resistance. , the brake master cylinder or the sub-pump oil leakage, the gas storage tank or the pipeline interface leaks;

Second, due to improper operation, the machine fails. For example, if the slope is down for a long time, the brake shoe will be frictionally heated, the brake hub will be charred, and the brake function will be completely invalid.

Third, due to the severe overload, under the effect of gravity acceleration, the vehicle's motion inertia is increased, which directly leads to brake failure.

What are the precursors to brake failure?

1. When the brakes are applied, the steering wheel is deflected.

If the brake is pressed, the steering wheel is deflected to one side. That is the effect of the left and right sub-pumps on the brake shoes. However, we do not simply find this problem. Because the brake disc rotates faster.

2. the brakes sink.

The brake shoe manufacturer reminds that if the brakes are applied in succession during the driving process, then the pedal orientation becomes higher. The brakes are sinking, and in general they are leaking!

3. the brakes are weak.

This is generally caused by the loss of pressure in the transfer line that provides the pressure. In this case, check whether the vacuum booster hose of the brake master cylinder and the engine interface are cracked or loose.

4. the brakes are shaking

Most of this situation is on the old body. Due to the large wear and tear, the flatness of the brake disc has been somewhat out of alignment. It can be solved by grinding the brake disc or directly replacing the brake disc.

Shake when braking, steering wheel. Originally, due to the brake disc overrun, the brake caliper was deformed and the brake shoe was ground into a cone. It is necessary to go to the factory for repairs.

5. the  rear brake does not return

During the driving process, it is necessary to judge whether the brake fluid is missing; whether the brake cylinder, the pipeline and the joint are leaking oil; whether the master pump and the pump parts are damaged. It is possible to consider cleaning the sub-pump or replacing the caliper.

The brakes will not return. When you step on the brake pedal, you feel high and hard or have no free travel. The car is difficult to start or is struggling. Fault phenomenon: step on the brake pedal, the pedal does not rise, no resistance. It is necessary to judge whether the brake fluid is missing; whether there is oil leakage at the brake cylinder, pipeline and joint; whether the master pump and the pump parts are damaged.

6. Brake shoes become hard and soft

The reason why the  rear brake shoes are hardened may be that the vacuum booster causes the brakes to be unhelpful or frequently brakes. There are three reasons why the brakes become soft: the oil pressure of the sub-pump or the main pump is not good (oil leakage); the brake shoes or the brake disc are faulty; the brake pipe leaks into the air (the brakes are repeatedly stepped on, the brakes are somewhat Increased and elastic, it is into the air)! Be sure to check and replace the parts in time.

What if the brakes suddenly fail?

When the car is driving, one foot or several brakes are connected, the brake pedal is stepped on, and the brake suddenly fails.

the reason:

Brake master cylinder or sub-pump oil leakage is severe

The brake master cylinder or the cylinder piston seal is broken or there is excessive air in the brake circuit. If this happens, you should agile the two-legged brakes. If you have a malfunction of the brake, you should check it immediately. First, investigate whether there is any loss of brake fluid in the brake fluid tank, and then investigate whether the brake master cylinder, the sub-pump, and the oil pipe leak the brake fluid.