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Why is there abnormal noise after replacing the new brake shoe?

new brake shoe
old brake shoe
old brake drum
A customer sent a photo (pictured) complaining about the quality of our Trcuk brake shoes.
 
We can see that there are two obvious scratches on the brake shoe on the customer's picture.
We asked the customer to take a picture of the old brake shoe and brake drum (as shown in the picture)
 
It can be seen that the customer's brake shoe also has two obvious scratches, and where the bottom of the brake shoe is in contact with the hub, the friction material is uneven and pitted, and it is obviously worn off by the edge of the brake drum.
Let's take a look at the old brake drum again. The edge of the drum is polished and shiny, and has a blue color, which should be burned at high temperature. In this case, it is not enough to replace the brake shoes.The brake drum has been worn out and should be replaced. Therefore, the sound is still ringing after replacing the new brake shoe, which is the problem of the old brake drum of the customer. 
After the customer replaced the new brake shoe under our suggestion, the product is very good, and he also gave us professional praise.

Post time: Aug-11-2023
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